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Linux 4gvps.4gvps.com 3.10.0-1127.18.2.vz7.163.46 #1 SMP Fri Nov 20 21:47:55 MSK 2020 x86_64
  SOFT : Apache PHP : 7.4.33
/proc/self/root/usr/share/mysql-test/r/
38.135.39.45

 
[ NAME ] [ SIZE ] [ PERM ] [ DATE ] [ ACT ]
+FILE +DIR
  1st.result 0.472 KB -rw-r--r-- 2021-01-05 10:19 R E G D
  alias.result 13.417 KB -rw-r--r-- 2021-01-05 10:19 R E G D
  almost_full.result 1.112 KB -rw-r--r-- 2021-01-05 10:19 R E G D
  alter_table-big.result 3.119 KB -rw-r--r-- 2021-01-05 10:19 R E G D
  alter_table.result 108.406 KB -rw-r--r-- 2021-01-05 10:19 R E G D
  analyze.result 2.207 KB -rw-r--r-- 2021-01-05 10:19 R E G D
  ansi.result 1.144 KB -rw-r--r-- 2021-01-05 10:19 R E G D
  archive-big.result 0.602 KB -rw-r--r-- 2021-01-05 10:19 R E G D
  archive.result 525.381 KB -rw-r--r-- 2021-01-05 10:19 R E G D
  archive_bitfield.result 4.261 KB -rw-r--r-- 2021-01-05 10:19 R E G D
  archive_debug.result 0.347 KB -rw-r--r-- 2021-01-05 10:19 R E G D
  archive_gis.result 23.132 KB -rw-r--r-- 2021-01-05 10:19 R E G D
  archive_no_symlink.result 0.861 KB -rw-r--r-- 2021-01-05 10:19 R E G D
  archive_plugin.result 0.53 KB -rw-r--r-- 2021-01-05 10:19 R E G D
  archive_symlink.result 2.068 KB -rw-r--r-- 2021-01-05 10:19 R E G D
  audit_plugin.result 0.727 KB -rw-r--r-- 2021-01-05 10:19 R E G D
  auth_rpl.result 1.846 KB -rw-r--r-- 2021-01-05 10:19 R E G D
  auto_increment.result 11.723 KB -rw-r--r-- 2021-01-05 10:19 R E G D
  backup.result 4.293 KB -rw-r--r-- 2021-01-05 10:19 R E G D
  bench_count_distinct.result 0.451 KB -rw-r--r-- 2021-01-05 10:19 R E G D
  big_test.require 0.017 KB -rw-r--r-- 2021-01-05 10:19 R E G D
  bigint.result 20.723 KB -rw-r--r-- 2021-01-05 10:19 R E G D
  binary.result 5.674 KB -rw-r--r-- 2021-01-05 10:19 R E G D
  binary_to_hex.result 5.87 KB -rw-r--r-- 2021-01-05 10:19 R E G D
  binlog_tx_isolation.result 1.707 KB -rw-r--r-- 2021-01-05 10:19 R E G D
  blackhole.result 0.599 KB -rw-r--r-- 2021-01-05 10:19 R E G D
  blackhole_plugin.result 0.558 KB -rw-r--r-- 2021-01-05 10:19 R E G D
  bool.result 2.56 KB -rw-r--r-- 2021-01-05 10:19 R E G D
  bootstrap.result 0.261 KB -rw-r--r-- 2021-01-05 10:19 R E G D
  bug12427262.result 1.864 KB -rw-r--r-- 2021-01-05 10:19 R E G D
  bug12969156.result 0.93 KB -rw-r--r-- 2021-01-05 10:19 R E G D
  bug17076131.result 0.314 KB -rw-r--r-- 2021-01-05 10:19 R E G D
  bug33509.result 2.306 KB -rw-r--r-- 2021-01-05 10:19 R E G D
  bug39022.result 1.199 KB -rw-r--r-- 2021-01-05 10:19 R E G D
  bug46080.result 0.653 KB -rw-r--r-- 2021-01-05 10:19 R E G D
  bug46261.result 0.373 KB -rw-r--r-- 2021-01-05 10:19 R E G D
  bug46760.result 1.259 KB -rw-r--r-- 2021-01-05 10:19 R E G D
  bug47671.result 0.28 KB -rw-r--r-- 2021-01-05 10:19 R E G D
  bug58669.result 0.469 KB -rw-r--r-- 2021-01-05 10:19 R E G D
  bulk_replace.result 0.274 KB -rw-r--r-- 2021-01-05 10:19 R E G D
  cache_innodb.result 5.419 KB -rw-r--r-- 2021-01-05 10:19 R E G D
  case.result 10.062 KB -rw-r--r-- 2021-01-05 10:19 R E G D
  case_insensitive_file_system.require 0.045 KB -rw-r--r-- 2021-01-05 10:19 R E G D
  case_sensitive_file_system.require 0.046 KB -rw-r--r-- 2021-01-05 10:19 R E G D
  cast.result 15.755 KB -rw-r--r-- 2021-01-05 10:19 R E G D
  change_user.result 3.31 KB -rw-r--r-- 2021-01-05 10:19 R E G D
  check.result 1.423 KB -rw-r--r-- 2021-01-05 10:19 R E G D
  check_auto_permission.result 0.245 KB -rw-r--r-- 2021-01-05 10:19 R E G D
  check_var_limit.require 0.008 KB -rw-r--r-- 2021-01-05 10:19 R E G D
  client_xml.result 2.376 KB -rw-r--r-- 2021-01-05 10:19 R E G D
  comment_column.result 140.568 KB -rw-r--r-- 2021-01-05 10:19 R E G D
  comment_column2.result 355.679 KB -rw-r--r-- 2021-01-05 10:19 R E G D
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  comment_table.result 28.718 KB -rw-r--r-- 2021-01-05 10:19 R E G D
  comments.result 2.337 KB -rw-r--r-- 2021-01-05 10:19 R E G D
  commit.result 13.321 KB -rw-r--r-- 2021-01-05 10:19 R E G D
  commit_1innodb.result 19.194 KB -rw-r--r-- 2021-01-05 10:19 R E G D
  compare.result 3.17 KB -rw-r--r-- 2021-01-05 10:19 R E G D
  compress.result 56.502 KB -rw-r--r-- 2021-01-05 10:19 R E G D
  concurrent_innodb_safelog.result 31.888 KB -rw-r--r-- 2021-01-05 10:19 R E G D
  concurrent_innodb_unsafelog.result 31.614 KB -rw-r--r-- 2021-01-05 10:19 R E G D
  connect.result 12.747 KB -rw-r--r-- 2021-01-05 10:19 R E G D
  connect_debug.result 1.481 KB -rw-r--r-- 2021-01-05 10:19 R E G D
  consistent_snapshot.result 1.144 KB -rw-r--r-- 2021-01-05 10:19 R E G D
  constraints.result 2.551 KB -rw-r--r-- 2021-01-05 10:19 R E G D
  count_distinct.result 7.89 KB -rw-r--r-- 2021-01-05 10:19 R E G D
  count_distinct2.result 2.215 KB -rw-r--r-- 2021-01-05 10:19 R E G D
  count_distinct3.result 0.271 KB -rw-r--r-- 2021-01-05 10:19 R E G D
  create-big.result 7.604 KB -rw-r--r-- 2021-01-05 10:19 R E G D
  create.result 147.088 KB -rw-r--r-- 2021-01-05 10:19 R E G D
  create_not_windows.result 0.938 KB -rw-r--r-- 2021-01-05 10:19 R E G D
  create_select_tmp.result 0.826 KB -rw-r--r-- 2021-01-05 10:19 R E G D
  csv.result 58.878 KB -rw-r--r-- 2021-01-05 10:19 R E G D
  csv_alter_table.result 1.168 KB -rw-r--r-- 2021-01-05 10:19 R E G D
  csv_not_null.result 1.752 KB -rw-r--r-- 2021-01-05 10:19 R E G D
  ctype_ascii.result 2.107 KB -rw-r--r-- 2021-01-05 10:19 R E G D
  ctype_big5.result 33.848 KB -rw-r--r-- 2021-01-05 10:19 R E G D
  ctype_binary.result 82.341 KB -rw-r--r-- 2021-01-05 10:19 R E G D
  ctype_collate.result 13.504 KB -rw-r--r-- 2021-01-05 10:19 R E G D
  ctype_cp1250_ch.result 21.882 KB -rw-r--r-- 2021-01-05 10:19 R E G D
  ctype_cp1251.result 96.091 KB -rw-r--r-- 2021-01-05 10:19 R E G D
  ctype_cp932.result 0.973 KB -rw-r--r-- 2021-01-05 10:19 R E G D
  ctype_cp932_binlog_row.result 0.593 KB -rw-r--r-- 2021-01-05 10:19 R E G D
  ctype_cp932_binlog_stm.result 251.22 KB -rw-r--r-- 2021-01-05 10:19 R E G D
  ctype_create.result 3.12 KB -rw-r--r-- 2021-01-05 10:19 R E G D
  ctype_errors.result 1.662 KB -rw-r--r-- 2021-01-05 10:19 R E G D
  ctype_eucjpms.result 400.215 KB -rw-r--r-- 2021-01-05 10:19 R E G D
  ctype_euckr.result 434.587 KB -rw-r--r-- 2021-01-05 10:19 R E G D
  ctype_filename.result 0.316 KB -rw-r--r-- 2021-01-05 10:19 R E G D
  ctype_filesystem.result 0.333 KB -rw-r--r-- 2021-01-05 10:19 R E G D
  ctype_gb2312.result 33.291 KB -rw-r--r-- 2021-01-05 10:19 R E G D
  ctype_gbk.result 49.631 KB -rw-r--r-- 2021-01-05 10:19 R E G D
  ctype_gbk_binlog.result 0.632 KB -rw-r--r-- 2021-01-05 10:19 R E G D
  ctype_hebrew.result 0.248 KB -rw-r--r-- 2021-01-05 10:19 R E G D
  ctype_latin1.result 118.674 KB -rw-r--r-- 2021-01-05 10:19 R E G D
  ctype_latin1_de.result 15.738 KB -rw-r--r-- 2021-01-05 10:19 R E G D
  ctype_latin2.result 13.319 KB -rw-r--r-- 2021-01-05 10:19 R E G D
  ctype_latin2_ch.result 25.112 KB -rw-r--r-- 2021-01-05 10:19 R E G D
  ctype_ldml.result 28.05 KB -rw-r--r-- 2021-01-05 10:19 R E G D
  ctype_like_range.result 80.895 KB -rw-r--r-- 2021-01-05 10:19 R E G D
  ctype_many.result 42.672 KB -rw-r--r-- 2021-01-05 10:19 R E G D
  ctype_mb.result 2.127 KB -rw-r--r-- 2021-01-05 10:19 R E G D
  ctype_recoding.result 9.598 KB -rw-r--r-- 2021-01-05 10:19 R E G D
  ctype_sjis.result 195.68 KB -rw-r--r-- 2021-01-05 10:19 R E G D
  ctype_tis620.result 100.449 KB -rw-r--r-- 2021-01-05 10:19 R E G D
  ctype_uca.result 154.97 KB -rw-r--r-- 2021-01-05 10:19 R E G D
  ctype_ucs.result 142.403 KB -rw-r--r-- 2021-01-05 10:19 R E G D
  ctype_ucs2_def.result 1.055 KB -rw-r--r-- 2021-01-05 10:19 R E G D
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REQUEST EXIT
drop table if exists t1; create table t1 ( a1 char(64), a2 char(64), b char(16), c char(16) not null, d char(16), dummy char(248) default ' ' ); insert into t1 (a1, a2, b, c, d) values ('a','a','a','a111','xy1'),('a','a','a','b111','xy2'),('a','a','a','c111','xy3'),('a','a','a','d111','xy4'), ('a','a','b','e112','xy1'),('a','a','b','f112','xy2'),('a','a','b','g112','xy3'),('a','a','b','h112','xy4'), ('a','b','a','i121','xy1'),('a','b','a','j121','xy2'),('a','b','a','k121','xy3'),('a','b','a','l121','xy4'), ('a','b','b','m122','xy1'),('a','b','b','n122','xy2'),('a','b','b','o122','xy3'),('a','b','b','p122','xy4'), ('b','a','a','a211','xy1'),('b','a','a','b211','xy2'),('b','a','a','c211','xy3'),('b','a','a','d211','xy4'), ('b','a','b','e212','xy1'),('b','a','b','f212','xy2'),('b','a','b','g212','xy3'),('b','a','b','h212','xy4'), ('b','b','a','i221','xy1'),('b','b','a','j221','xy2'),('b','b','a','k221','xy3'),('b','b','a','l221','xy4'), ('b','b','b','m222','xy1'),('b','b','b','n222','xy2'),('b','b','b','o222','xy3'),('b','b','b','p222','xy4'), ('c','a','a','a311','xy1'),('c','a','a','b311','xy2'),('c','a','a','c311','xy3'),('c','a','a','d311','xy4'), ('c','a','b','e312','xy1'),('c','a','b','f312','xy2'),('c','a','b','g312','xy3'),('c','a','b','h312','xy4'), ('c','b','a','i321','xy1'),('c','b','a','j321','xy2'),('c','b','a','k321','xy3'),('c','b','a','l321','xy4'), ('c','b','b','m322','xy1'),('c','b','b','n322','xy2'),('c','b','b','o322','xy3'),('c','b','b','p322','xy4'), ('d','a','a','a411','xy1'),('d','a','a','b411','xy2'),('d','a','a','c411','xy3'),('d','a','a','d411','xy4'), ('d','a','b','e412','xy1'),('d','a','b','f412','xy2'),('d','a','b','g412','xy3'),('d','a','b','h412','xy4'), ('d','b','a','i421','xy1'),('d','b','a','j421','xy2'),('d','b','a','k421','xy3'),('d','b','a','l421','xy4'), ('d','b','b','m422','xy1'),('d','b','b','n422','xy2'),('d','b','b','o422','xy3'),('d','b','b','p422','xy4'), ('a','a','a','a111','xy1'),('a','a','a','b111','xy2'),('a','a','a','c111','xy3'),('a','a','a','d111','xy4'), ('a','a','b','e112','xy1'),('a','a','b','f112','xy2'),('a','a','b','g112','xy3'),('a','a','b','h112','xy4'), ('a','b','a','i121','xy1'),('a','b','a','j121','xy2'),('a','b','a','k121','xy3'),('a','b','a','l121','xy4'), ('a','b','b','m122','xy1'),('a','b','b','n122','xy2'),('a','b','b','o122','xy3'),('a','b','b','p122','xy4'), ('b','a','a','a211','xy1'),('b','a','a','b211','xy2'),('b','a','a','c211','xy3'),('b','a','a','d211','xy4'), ('b','a','b','e212','xy1'),('b','a','b','f212','xy2'),('b','a','b','g212','xy3'),('b','a','b','h212','xy4'), ('b','b','a','i221','xy1'),('b','b','a','j221','xy2'),('b','b','a','k221','xy3'),('b','b','a','l221','xy4'), ('b','b','b','m222','xy1'),('b','b','b','n222','xy2'),('b','b','b','o222','xy3'),('b','b','b','p222','xy4'), ('c','a','a','a311','xy1'),('c','a','a','b311','xy2'),('c','a','a','c311','xy3'),('c','a','a','d311','xy4'), ('c','a','b','e312','xy1'),('c','a','b','f312','xy2'),('c','a','b','g312','xy3'),('c','a','b','h312','xy4'), ('c','b','a','i321','xy1'),('c','b','a','j321','xy2'),('c','b','a','k321','xy3'),('c','b','a','l321','xy4'), ('c','b','b','m322','xy1'),('c','b','b','n322','xy2'),('c','b','b','o322','xy3'),('c','b','b','p322','xy4'), ('d','a','a','a411','xy1'),('d','a','a','b411','xy2'),('d','a','a','c411','xy3'),('d','a','a','d411','xy4'), ('d','a','b','e412','xy1'),('d','a','b','f412','xy2'),('d','a','b','g412','xy3'),('d','a','b','h412','xy4'), ('d','b','a','i421','xy1'),('d','b','a','j421','xy2'),('d','b','a','k421','xy3'),('d','b','a','l421','xy4'), ('d','b','b','m422','xy1'),('d','b','b','n422','xy2'),('d','b','b','o422','xy3'),('d','b','b','p422','xy4'); create index idx_t1_0 on t1 (a1); create index idx_t1_1 on t1 (a1,a2,b,c); create index idx_t1_2 on t1 (a1,a2,b); analyze table t1; Table Op Msg_type Msg_text test.t1 analyze status Table is already up to date drop table if exists t2; create table t2 ( a1 char(64), a2 char(64) not null, b char(16), c char(16), d char(16), dummy char(248) default ' ' ); insert into t2 select * from t1; insert into t2 (a1, a2, b, c, d) values ('a','a',NULL,'a777','xyz'),('a','a',NULL,'a888','xyz'),('a','a',NULL,'a999','xyz'), ('a','a','a',NULL,'xyz'), ('a','a','b',NULL,'xyz'), ('a','b','a',NULL,'xyz'), ('c','a',NULL,'c777','xyz'),('c','a',NULL,'c888','xyz'),('c','a',NULL,'c999','xyz'), ('d','b','b',NULL,'xyz'), ('e','a','a',NULL,'xyz'),('e','a','a',NULL,'xyz'),('e','a','a',NULL,'xyz'),('e','a','a',NULL,'xyz'), ('e','a','b',NULL,'xyz'),('e','a','b',NULL,'xyz'),('e','a','b',NULL,'xyz'),('e','a','b',NULL,'xyz'), ('a','a',NULL,'a777','xyz'),('a','a',NULL,'a888','xyz'),('a','a',NULL,'a999','xyz'), ('a','a','a',NULL,'xyz'), ('a','a','b',NULL,'xyz'), ('a','b','a',NULL,'xyz'), ('c','a',NULL,'c777','xyz'),('c','a',NULL,'c888','xyz'),('c','a',NULL,'c999','xyz'), ('d','b','b',NULL,'xyz'), ('e','a','a',NULL,'xyz'),('e','a','a',NULL,'xyz'),('e','a','a',NULL,'xyz'),('e','a','a',NULL,'xyz'), ('e','a','b',NULL,'xyz'),('e','a','b',NULL,'xyz'),('e','a','b',NULL,'xyz'),('e','a','b',NULL,'xyz'); create index idx_t2_0 on t2 (a1); create index idx_t2_1 on t2 (a1,a2,b,c); create index idx_t2_2 on t2 (a1,a2,b); analyze table t2; Table Op Msg_type Msg_text test.t2 analyze status Table is already up to date drop table if exists t3; create table t3 ( a1 char(1), a2 char(1), b char(1), c char(4) not null, d char(3), dummy char(1) default ' ' ); insert into t3 (a1, a2, b, c, d) values ('a','a','a','a111','xy1'),('a','a','a','b111','xy2'),('a','a','a','c111','xy3'),('a','a','a','d111','xy4'), ('a','a','b','e112','xy1'),('a','a','b','f112','xy2'),('a','a','b','g112','xy3'),('a','a','b','h112','xy4'), ('a','b','a','i121','xy1'),('a','b','a','j121','xy2'),('a','b','a','k121','xy3'),('a','b','a','l121','xy4'), ('a','b','b','m122','xy1'),('a','b','b','n122','xy2'),('a','b','b','o122','xy3'),('a','b','b','p122','xy4'), ('b','a','a','a211','xy1'),('b','a','a','b211','xy2'),('b','a','a','c211','xy3'),('b','a','a','d211','xy4'), ('b','a','b','e212','xy1'),('b','a','b','f212','xy2'),('b','a','b','g212','xy3'),('b','a','b','h212','xy4'), ('b','b','a','i221','xy1'),('b','b','a','j221','xy2'),('b','b','a','k221','xy3'),('b','b','a','l221','xy4'), ('b','b','b','m222','xy1'),('b','b','b','n222','xy2'),('b','b','b','o222','xy3'),('b','b','b','p222','xy4'), ('c','a','a','a311','xy1'),('c','a','a','b311','xy2'),('c','a','a','c311','xy3'),('c','a','a','d311','xy4'), ('c','a','b','e312','xy1'),('c','a','b','f312','xy2'),('c','a','b','g312','xy3'),('c','a','b','h312','xy4'), ('c','b','a','i321','xy1'),('c','b','a','j321','xy2'),('c','b','a','k321','xy3'),('c','b','a','l321','xy4'), ('c','b','b','m322','xy1'),('c','b','b','n322','xy2'),('c','b','b','o322','xy3'),('c','b','b','p322','xy4'); insert into t3 (a1, a2, b, c, d) values ('a','a','a','a111','xy1'),('a','a','a','b111','xy2'),('a','a','a','c111','xy3'),('a','a','a','d111','xy4'), ('a','a','b','e112','xy1'),('a','a','b','f112','xy2'),('a','a','b','g112','xy3'),('a','a','b','h112','xy4'), ('a','b','a','i121','xy1'),('a','b','a','j121','xy2'),('a','b','a','k121','xy3'),('a','b','a','l121','xy4'), ('a','b','b','m122','xy1'),('a','b','b','n122','xy2'),('a','b','b','o122','xy3'),('a','b','b','p122','xy4'), ('b','a','a','a211','xy1'),('b','a','a','b211','xy2'),('b','a','a','c211','xy3'),('b','a','a','d211','xy4'), ('b','a','b','e212','xy1'),('b','a','b','f212','xy2'),('b','a','b','g212','xy3'),('b','a','b','h212','xy4'), ('b','b','a','i221','xy1'),('b','b','a','j221','xy2'),('b','b','a','k221','xy3'),('b','b','a','l221','xy4'), ('b','b','b','m222','xy1'),('b','b','b','n222','xy2'),('b','b','b','o222','xy3'),('b','b','b','p222','xy4'), ('c','a','a','a311','xy1'),('c','a','a','b311','xy2'),('c','a','a','c311','xy3'),('c','a','a','d311','xy4'), ('c','a','b','e312','xy1'),('c','a','b','f312','xy2'),('c','a','b','g312','xy3'),('c','a','b','h312','xy4'), ('c','b','a','i321','xy1'),('c','b','a','j321','xy2'),('c','b','a','k321','xy3'),('c','b','a','l321','xy4'), ('c','b','b','m322','xy1'),('c','b','b','n322','xy2'),('c','b','b','o322','xy3'),('c','b','b','p322','xy4'); insert into t3 (a1, a2, b, c, d) values ('a','a','a','a111','xy1'),('a','a','a','b111','xy2'),('a','a','a','c111','xy3'),('a','a','a','d111','xy4'), ('a','a','b','e112','xy1'),('a','a','b','f112','xy2'),('a','a','b','g112','xy3'),('a','a','b','h112','xy4'), ('a','b','a','i121','xy1'),('a','b','a','j121','xy2'),('a','b','a','k121','xy3'),('a','b','a','l121','xy4'), ('a','b','b','m122','xy1'),('a','b','b','n122','xy2'),('a','b','b','o122','xy3'),('a','b','b','p122','xy4'), ('b','a','a','a211','xy1'),('b','a','a','b211','xy2'),('b','a','a','c211','xy3'),('b','a','a','d211','xy4'), ('b','a','b','e212','xy1'),('b','a','b','f212','xy2'),('b','a','b','g212','xy3'),('b','a','b','h212','xy4'), ('b','b','a','i221','xy1'),('b','b','a','j221','xy2'),('b','b','a','k221','xy3'),('b','b','a','l221','xy4'), ('b','b','b','m222','xy1'),('b','b','b','n222','xy2'),('b','b','b','o222','xy3'),('b','b','b','p222','xy4'), ('c','a','a','a311','xy1'),('c','a','a','b311','xy2'),('c','a','a','c311','xy3'),('c','a','a','d311','xy4'), ('c','a','b','e312','xy1'),('c','a','b','f312','xy2'),('c','a','b','g312','xy3'),('c','a','b','h312','xy4'), ('c','b','a','i321','xy1'),('c','b','a','j321','xy2'),('c','b','a','k321','xy3'),('c','b','a','l321','xy4'), ('c','b','b','m322','xy1'),('c','b','b','n322','xy2'),('c','b','b','o322','xy3'),('c','b','b','p322','xy4'); insert into t3 (a1, a2, b, c, d) values ('a','a','a','a111','xy1'),('a','a','a','b111','xy2'),('a','a','a','c111','xy3'),('a','a','a','d111','xy4'), ('a','a','b','e112','xy1'),('a','a','b','f112','xy2'),('a','a','b','g112','xy3'),('a','a','b','h112','xy4'), ('a','b','a','i121','xy1'),('a','b','a','j121','xy2'),('a','b','a','k121','xy3'),('a','b','a','l121','xy4'), ('a','b','b','m122','xy1'),('a','b','b','n122','xy2'),('a','b','b','o122','xy3'),('a','b','b','p122','xy4'), ('b','a','a','a211','xy1'),('b','a','a','b211','xy2'),('b','a','a','c211','xy3'),('b','a','a','d211','xy4'), ('b','a','b','e212','xy1'),('b','a','b','f212','xy2'),('b','a','b','g212','xy3'),('b','a','b','h212','xy4'), ('b','b','a','i221','xy1'),('b','b','a','j221','xy2'),('b','b','a','k221','xy3'),('b','b','a','l221','xy4'), ('b','b','b','m222','xy1'),('b','b','b','n222','xy2'),('b','b','b','o222','xy3'),('b','b','b','p222','xy4'), ('c','a','a','a311','xy1'),('c','a','a','b311','xy2'),('c','a','a','c311','xy3'),('c','a','a','d311','xy4'), ('c','a','b','e312','xy1'),('c','a','b','f312','xy2'),('c','a','b','g312','xy3'),('c','a','b','h312','xy4'), ('c','b','a','i321','xy1'),('c','b','a','j321','xy2'),('c','b','a','k321','xy3'),('c','b','a','l321','xy4'), ('c','b','b','m322','xy1'),('c','b','b','n322','xy2'),('c','b','b','o322','xy3'),('c','b','b','p322','xy4'); create index idx_t3_0 on t3 (a1); create index idx_t3_1 on t3 (a1,a2,b,c); create index idx_t3_2 on t3 (a1,a2,b); analyze table t3; Table Op Msg_type Msg_text test.t3 analyze status Table is already up to date explain select a1, min(a2) from t1 group by a1; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 range idx_t1_0,idx_t1_1,idx_t1_2 idx_t1_1 130 NULL 5 Using index for group-by explain select a1, max(a2) from t1 group by a1; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 range idx_t1_0,idx_t1_1,idx_t1_2 idx_t1_1 65 NULL 5 Using index for group-by explain select a1, min(a2), max(a2) from t1 group by a1; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 range idx_t1_0,idx_t1_1,idx_t1_2 idx_t1_1 130 NULL 5 Using index for group-by explain select a1, a2, b, min(c), max(c) from t1 group by a1,a2,b; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 range idx_t1_1,idx_t1_2 idx_t1_1 147 NULL 17 Using index for group-by explain select a1,a2,b,max(c),min(c) from t1 group by a1,a2,b; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 range idx_t1_1,idx_t1_2 idx_t1_1 147 NULL 17 Using index for group-by explain select a1,a2,b,max(c),min(c) from t2 group by a1,a2,b; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t2 range idx_t2_1,idx_t2_2 idx_t2_1 # NULL # Using index for group-by explain select min(a2), a1, max(a2), min(a2), a1 from t1 group by a1; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 range idx_t1_0,idx_t1_1,idx_t1_2 idx_t1_1 130 NULL 5 Using index for group-by explain select a1, b, min(c), a1, max(c), b, a2, max(c), max(c) from t1 group by a1, a2, b; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 range idx_t1_1,idx_t1_2 idx_t1_1 147 NULL 17 Using index for group-by explain select min(a2) from t1 group by a1; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 range idx_t1_0,idx_t1_1,idx_t1_2 idx_t1_1 130 NULL 5 Using index for group-by explain select a2, min(c), max(c) from t1 group by a1,a2,b; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 range idx_t1_1,idx_t1_2 idx_t1_1 147 NULL 17 Using index for group-by select a1, min(a2) from t1 group by a1; a1 min(a2) a a b a c a d a select a1, max(a2) from t1 group by a1; a1 max(a2) a b b b c b d b select a1, min(a2), max(a2) from t1 group by a1; a1 min(a2) max(a2) a a b b a b c a b d a b select a1, a2, b, min(c), max(c) from t1 group by a1,a2,b; a1 a2 b min(c) max(c) a a a a111 d111 a a b e112 h112 a b a i121 l121 a b b m122 p122 b a a a211 d211 b a b e212 h212 b b a i221 l221 b b b m222 p222 c a a a311 d311 c a b e312 h312 c b a i321 l321 c b b m322 p322 d a a a411 d411 d a b e412 h412 d b a i421 l421 d b b m422 p422 select a1,a2,b,max(c),min(c) from t1 group by a1,a2,b; a1 a2 b max(c) min(c) a a a d111 a111 a a b h112 e112 a b a l121 i121 a b b p122 m122 b a a d211 a211 b a b h212 e212 b b a l221 i221 b b b p222 m222 c a a d311 a311 c a b h312 e312 c b a l321 i321 c b b p322 m322 d a a d411 a411 d a b h412 e412 d b a l421 i421 d b b p422 m422 select a1,a2,b,max(c),min(c) from t2 group by a1,a2,b; a1 a2 b max(c) min(c) a a NULL a999 a777 a a a d111 a111 a a b h112 e112 a b a l121 i121 a b b p122 m122 b a a d211 a211 b a b h212 e212 b b a l221 i221 b b b p222 m222 c a NULL c999 c777 c a a d311 a311 c a b h312 e312 c b a l321 i321 c b b p322 m322 d a a d411 a411 d a b h412 e412 d b a l421 i421 d b b p422 m422 e a a NULL NULL e a b NULL NULL select min(a2), a1, max(a2), min(a2), a1 from t1 group by a1; min(a2) a1 max(a2) min(a2) a1 a a b a a a b b a b a c b a c a d b a d select a1, b, min(c), a1, max(c), b, a2, max(c), max(c) from t1 group by a1, a2, b; a1 b min(c) a1 max(c) b a2 max(c) max(c) a a a111 a d111 a a d111 d111 a b e112 a h112 b a h112 h112 a a i121 a l121 a b l121 l121 a b m122 a p122 b b p122 p122 b a a211 b d211 a a d211 d211 b b e212 b h212 b a h212 h212 b a i221 b l221 a b l221 l221 b b m222 b p222 b b p222 p222 c a a311 c d311 a a d311 d311 c b e312 c h312 b a h312 h312 c a i321 c l321 a b l321 l321 c b m322 c p322 b b p322 p322 d a a411 d d411 a a d411 d411 d b e412 d h412 b a h412 h412 d a i421 d l421 a b l421 l421 d b m422 d p422 b b p422 p422 select min(a2) from t1 group by a1; min(a2) a a a a select a2, min(c), max(c) from t1 group by a1,a2,b; a2 min(c) max(c) a a111 d111 a e112 h112 b i121 l121 b m122 p122 a a211 d211 a e212 h212 b i221 l221 b m222 p222 a a311 d311 a e312 h312 b i321 l321 b m322 p322 a a411 d411 a e412 h412 b i421 l421 b m422 p422 explain select a1,a2,b,min(c),max(c) from t1 where a1 < 'd' group by a1,a2,b; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 range idx_t1_0,idx_t1_1,idx_t1_2 idx_t1_1 147 NULL 10 Using where; Using index for group-by explain select a1,a2,b,min(c),max(c) from t1 where a1 >= 'b' group by a1,a2,b; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 range idx_t1_0,idx_t1_1,idx_t1_2 idx_t1_1 147 NULL 14 Using where; Using index for group-by explain select a1,a2,b, max(c) from t1 where a1 >= 'c' or a1 < 'b' group by a1,a2,b; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 range idx_t1_0,idx_t1_1,idx_t1_2 idx_t1_1 147 NULL 14 Using where; Using index for group-by explain select a1, max(c) from t1 where a1 >= 'c' or a1 < 'b' group by a1,a2,b; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 range idx_t1_0,idx_t1_1,idx_t1_2 idx_t1_1 147 NULL 14 Using where; Using index for group-by explain select a1,a2,b,min(c),max(c) from t1 where a1 >= 'c' or a2 < 'b' group by a1,a2,b; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 range idx_t1_0,idx_t1_1,idx_t1_2 idx_t1_1 147 NULL 17 Using where; Using index for group-by explain select a1,a2,b, max(c) from t1 where a1 = 'z' or a1 = 'b' or a1 = 'd' group by a1,a2,b; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 range idx_t1_0,idx_t1_1,idx_t1_2 idx_t1_1 147 NULL 10 Using where; Using index for group-by explain select a1,a2,b,min(c),max(c) from t1 where a1 = 'z' or a1 = 'b' or a1 = 'd' group by a1,a2,b; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 range idx_t1_0,idx_t1_1,idx_t1_2 idx_t1_1 147 NULL 10 Using where; Using index for group-by explain select a1,a2,b, max(c) from t1 where (a1 = 'b' or a1 = 'd' or a1 = 'a' or a1 = 'c') and (a2 > 'a') group by a1,a2,b; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 range idx_t1_0,idx_t1_1,idx_t1_2 idx_t1_1 147 NULL 10 Using where; Using index for group-by explain select a1,a2,b,min(c),max(c) from t1 where (a1 = 'b' or a1 = 'd' or a1 = 'a' or a1 = 'c') and (a2 > 'a') group by a1,a2,b; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 range idx_t1_0,idx_t1_1,idx_t1_2 idx_t1_1 147 NULL 10 Using where; Using index for group-by explain select a1,min(c),max(c) from t1 where a1 >= 'b' group by a1,a2,b; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 range idx_t1_0,idx_t1_1,idx_t1_2 idx_t1_1 147 NULL 14 Using where; Using index for group-by explain select a1, max(c) from t1 where a1 in ('a','b','d') group by a1,a2,b; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 range idx_t1_0,idx_t1_1,idx_t1_2 idx_t1_1 147 NULL 14 Using where; Using index for group-by explain select a1,a2,b, max(c) from t2 where a1 < 'd' group by a1,a2,b; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t2 range idx_t2_0,idx_t2_1,idx_t2_2 idx_t2_1 146 NULL # Using where; Using index for group-by explain select a1,a2,b,min(c),max(c) from t2 where a1 < 'd' group by a1,a2,b; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t2 range idx_t2_0,idx_t2_1,idx_t2_2 idx_t2_1 163 NULL # Using where; Using index for group-by explain select a1,a2,b,min(c),max(c) from t2 where a1 >= 'b' group by a1,a2,b; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t2 range idx_t2_0,idx_t2_1,idx_t2_2 idx_t2_1 163 NULL # Using where; Using index for group-by explain select a1,a2,b, max(c) from t2 where a1 >= 'c' or a1 < 'b' group by a1,a2,b; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t2 range idx_t2_0,idx_t2_1,idx_t2_2 idx_t2_1 146 NULL # Using where; Using index for group-by explain select a1, max(c) from t2 where a1 >= 'c' or a1 < 'b' group by a1,a2,b; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t2 range idx_t2_0,idx_t2_1,idx_t2_2 idx_t2_1 146 NULL # Using where; Using index for group-by explain select a1,a2,b,min(c),max(c) from t2 where a1 >= 'c' or a2 < 'b' group by a1,a2,b; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t2 range idx_t2_0,idx_t2_1,idx_t2_2 idx_t2_1 163 NULL # Using where; Using index for group-by explain select a1,a2,b, max(c) from t2 where a1 = 'z' or a1 = 'b' or a1 = 'd' group by a1,a2,b; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t2 range idx_t2_0,idx_t2_1,idx_t2_2 idx_t2_1 146 NULL # Using where; Using index for group-by explain select a1,a2,b,min(c),max(c) from t2 where a1 = 'z' or a1 = 'b' or a1 = 'd' group by a1,a2,b; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t2 range idx_t2_0,idx_t2_1,idx_t2_2 idx_t2_1 163 NULL # Using where; Using index for group-by explain select a1,a2,b, max(c) from t2 where (a1 = 'b' or a1 = 'd' or a1 = 'a' or a1 = 'c') and (a2 > 'a') group by a1,a2,b; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t2 range idx_t2_0,idx_t2_1,idx_t2_2 idx_t2_1 146 NULL # Using where; Using index for group-by explain select a1,a2,b,min(c),max(c) from t2 where (a1 = 'b' or a1 = 'd' or a1 = 'a' or a1 = 'c') and (a2 > 'a') group by a1,a2,b; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t2 range idx_t2_0,idx_t2_1,idx_t2_2 idx_t2_1 163 NULL # Using where; Using index for group-by explain select a1,min(c),max(c) from t2 where a1 >= 'b' group by a1,a2,b; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t2 range idx_t2_0,idx_t2_1,idx_t2_2 idx_t2_1 163 NULL # Using where; Using index for group-by explain select a1, max(c) from t2 where a1 in ('a','b','d') group by a1,a2,b; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t2 range idx_t2_0,idx_t2_1,idx_t2_2 idx_t2_1 146 NULL # Using where; Using index for group-by select a1,a2,b,min(c),max(c) from t1 where a1 < 'd' group by a1,a2,b; a1 a2 b min(c) max(c) a a a a111 d111 a a b e112 h112 a b a i121 l121 a b b m122 p122 b a a a211 d211 b a b e212 h212 b b a i221 l221 b b b m222 p222 c a a a311 d311 c a b e312 h312 c b a i321 l321 c b b m322 p322 select a1,a2,b,min(c),max(c) from t1 where a1 >= 'b' group by a1,a2,b; a1 a2 b min(c) max(c) b a a a211 d211 b a b e212 h212 b b a i221 l221 b b b m222 p222 c a a a311 d311 c a b e312 h312 c b a i321 l321 c b b m322 p322 d a a a411 d411 d a b e412 h412 d b a i421 l421 d b b m422 p422 select a1,a2,b, max(c) from t1 where a1 >= 'c' or a1 < 'b' group by a1,a2,b; a1 a2 b max(c) a a a d111 a a b h112 a b a l121 a b b p122 c a a d311 c a b h312 c b a l321 c b b p322 d a a d411 d a b h412 d b a l421 d b b p422 select a1, max(c) from t1 where a1 >= 'c' or a1 < 'b' group by a1,a2,b; a1 max(c) a d111 a h112 a l121 a p122 c d311 c h312 c l321 c p322 d d411 d h412 d l421 d p422 select a1,a2,b,min(c),max(c) from t1 where a1 >= 'c' or a2 < 'b' group by a1,a2,b; a1 a2 b min(c) max(c) a a a a111 d111 a a b e112 h112 b a a a211 d211 b a b e212 h212 c a a a311 d311 c a b e312 h312 c b a i321 l321 c b b m322 p322 d a a a411 d411 d a b e412 h412 d b a i421 l421 d b b m422 p422 select a1,a2,b, max(c) from t1 where a1 = 'z' or a1 = 'b' or a1 = 'd' group by a1,a2,b; a1 a2 b max(c) b a a d211 b a b h212 b b a l221 b b b p222 d a a d411 d a b h412 d b a l421 d b b p422 select a1,a2,b,min(c),max(c) from t1 where a1 = 'z' or a1 = 'b' or a1 = 'd' group by a1,a2,b; a1 a2 b min(c) max(c) b a a a211 d211 b a b e212 h212 b b a i221 l221 b b b m222 p222 d a a a411 d411 d a b e412 h412 d b a i421 l421 d b b m422 p422 select a1,a2,b, max(c) from t1 where (a1 = 'b' or a1 = 'd' or a1 = 'a' or a1 = 'c') and (a2 > 'a') group by a1,a2,b; a1 a2 b max(c) a b a l121 a b b p122 b b a l221 b b b p222 c b a l321 c b b p322 d b a l421 d b b p422 select a1,a2,b,min(c),max(c) from t1 where (a1 = 'b' or a1 = 'd' or a1 = 'a' or a1 = 'c') and (a2 > 'a') group by a1,a2,b; a1 a2 b min(c) max(c) a b a i121 l121 a b b m122 p122 b b a i221 l221 b b b m222 p222 c b a i321 l321 c b b m322 p322 d b a i421 l421 d b b m422 p422 select a1,min(c),max(c) from t1 where a1 >= 'b' group by a1,a2,b; a1 min(c) max(c) b a211 d211 b e212 h212 b i221 l221 b m222 p222 c a311 d311 c e312 h312 c i321 l321 c m322 p322 d a411 d411 d e412 h412 d i421 l421 d m422 p422 select a1, max(c) from t1 where a1 in ('a','b','d') group by a1,a2,b; a1 max(c) a d111 a h112 a l121 a p122 b d211 b h212 b l221 b p222 d d411 d h412 d l421 d p422 select a1,a2,b, max(c) from t2 where a1 < 'd' group by a1,a2,b; a1 a2 b max(c) a a NULL a999 a a a d111 a a b h112 a b a l121 a b b p122 b a a d211 b a b h212 b b a l221 b b b p222 c a NULL c999 c a a d311 c a b h312 c b a l321 c b b p322 select a1,a2,b,min(c),max(c) from t2 where a1 < 'd' group by a1,a2,b; a1 a2 b min(c) max(c) a a NULL a777 a999 a a a a111 d111 a a b e112 h112 a b a i121 l121 a b b m122 p122 b a a a211 d211 b a b e212 h212 b b a i221 l221 b b b m222 p222 c a NULL c777 c999 c a a a311 d311 c a b e312 h312 c b a i321 l321 c b b m322 p322 select a1,a2,b,min(c),max(c) from t2 where a1 >= 'b' group by a1,a2,b; a1 a2 b min(c) max(c) b a a a211 d211 b a b e212 h212 b b a i221 l221 b b b m222 p222 c a NULL c777 c999 c a a a311 d311 c a b e312 h312 c b a i321 l321 c b b m322 p322 d a a a411 d411 d a b e412 h412 d b a i421 l421 d b b m422 p422 e a a NULL NULL e a b NULL NULL select a1,a2,b, max(c) from t2 where a1 >= 'c' or a1 < 'b' group by a1,a2,b; a1 a2 b max(c) a a NULL a999 a a a d111 a a b h112 a b a l121 a b b p122 c a NULL c999 c a a d311 c a b h312 c b a l321 c b b p322 d a a d411 d a b h412 d b a l421 d b b p422 e a a NULL e a b NULL select a1, max(c) from t2 where a1 >= 'c' or a1 < 'b' group by a1,a2,b; a1 max(c) a a999 a d111 a h112 a l121 a p122 c c999 c d311 c h312 c l321 c p322 d d411 d h412 d l421 d p422 e NULL e NULL select a1,a2,b,min(c),max(c) from t2 where a1 >= 'c' or a2 < 'b' group by a1,a2,b; a1 a2 b min(c) max(c) a a NULL a777 a999 a a a a111 d111 a a b e112 h112 b a a a211 d211 b a b e212 h212 c a NULL c777 c999 c a a a311 d311 c a b e312 h312 c b a i321 l321 c b b m322 p322 d a a a411 d411 d a b e412 h412 d b a i421 l421 d b b m422 p422 e a a NULL NULL e a b NULL NULL select a1,a2,b, max(c) from t2 where a1 = 'z' or a1 = 'b' or a1 = 'd' group by a1,a2,b; a1 a2 b max(c) b a a d211 b a b h212 b b a l221 b b b p222 d a a d411 d a b h412 d b a l421 d b b p422 select a1,a2,b,min(c),max(c) from t2 where a1 = 'z' or a1 = 'b' or a1 = 'd' group by a1,a2,b; a1 a2 b min(c) max(c) b a a a211 d211 b a b e212 h212 b b a i221 l221 b b b m222 p222 d a a a411 d411 d a b e412 h412 d b a i421 l421 d b b m422 p422 select a1,a2,b, max(c) from t2 where (a1 = 'b' or a1 = 'd' or a1 = 'a' or a1 = 'c') and (a2 > 'a') group by a1,a2,b; a1 a2 b max(c) a b a l121 a b b p122 b b a l221 b b b p222 c b a l321 c b b p322 d b a l421 d b b p422 select a1,a2,b,min(c),max(c) from t2 where (a1 = 'b' or a1 = 'd' or a1 = 'a' or a1 = 'c') and (a2 > 'a') group by a1,a2,b; a1 a2 b min(c) max(c) a b a i121 l121 a b b m122 p122 b b a i221 l221 b b b m222 p222 c b a i321 l321 c b b m322 p322 d b a i421 l421 d b b m422 p422 select a1,min(c),max(c) from t2 where a1 >= 'b' group by a1,a2,b; a1 min(c) max(c) b a211 d211 b e212 h212 b i221 l221 b m222 p222 c c777 c999 c a311 d311 c e312 h312 c i321 l321 c m322 p322 d a411 d411 d e412 h412 d i421 l421 d m422 p422 e NULL NULL e NULL NULL select a1, max(c) from t2 where a1 in ('a','b','d') group by a1,a2,b; a1 max(c) a a999 a d111 a h112 a l121 a p122 b d211 b h212 b l221 b p222 d d411 d h412 d l421 d p422 explain select a1,a2,b,max(c),min(c) from t1 where (a2 = 'a') and (b = 'b') group by a1; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 range idx_t1_0,idx_t1_1,idx_t1_2 idx_t1_1 147 NULL 5 Using where; Using index for group-by explain select a1,max(c),min(c) from t1 where (a2 = 'a') and (b = 'b') group by a1; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 range idx_t1_0,idx_t1_1,idx_t1_2 idx_t1_1 147 NULL 5 Using where; Using index for group-by explain select a1,a2,b, max(c) from t1 where (b = 'b') group by a1,a2; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 range idx_t1_1,idx_t1_2 idx_t1_1 147 NULL 9 Using where; Using index for group-by explain select a1,a2,b,min(c),max(c) from t1 where (b = 'b') group by a1,a2; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 range idx_t1_1,idx_t1_2 idx_t1_1 147 NULL 9 Using where; Using index for group-by explain select a1,a2, max(c) from t1 where (b = 'b') group by a1,a2; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 range idx_t1_1,idx_t1_2 idx_t1_1 147 NULL 9 Using where; Using index for group-by explain select a1,a2,b,max(c),min(c) from t2 where (a2 = 'a') and (b = 'b') group by a1; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t2 range idx_t2_0,idx_t2_1,idx_t2_2 idx_t2_1 163 NULL 5 Using where; Using index for group-by explain select a1,max(c),min(c) from t2 where (a2 = 'a') and (b = 'b') group by a1; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t2 range idx_t2_0,idx_t2_1,idx_t2_2 idx_t2_1 163 NULL 5 Using where; Using index for group-by explain select a1,a2,b, max(c) from t2 where (b = 'b') group by a1,a2; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t2 range idx_t2_1,idx_t2_2 idx_t2_1 146 NULL 10 Using where; Using index for group-by explain select a1,a2,b,min(c),max(c) from t2 where (b = 'b') group by a1,a2; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t2 range idx_t2_1,idx_t2_2 idx_t2_1 163 NULL 10 Using where; Using index for group-by explain select a1,a2, max(c) from t2 where (b = 'b') group by a1,a2; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t2 range idx_t2_1,idx_t2_2 idx_t2_1 146 NULL 10 Using where; Using index for group-by explain select a1,a2,b,max(c),min(c) from t3 where (a2 = 'a') and (b = 'b') group by a1; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t3 range idx_t3_0,idx_t3_1,idx_t3_2 idx_t3_1 6 NULL 4 Using where; Using index for group-by explain select a1,max(c),min(c) from t3 where (a2 = 'a') and (b = 'b') group by a1; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t3 range idx_t3_0,idx_t3_1,idx_t3_2 idx_t3_1 6 NULL 4 Using where; Using index for group-by select a1,a2,b,max(c),min(c) from t1 where (a2 = 'a') and (b = 'b') group by a1; a1 a2 b max(c) min(c) a a b h112 e112 b a b h212 e212 c a b h312 e312 d a b h412 e412 select a1,max(c),min(c) from t1 where (a2 = 'a') and (b = 'b') group by a1; a1 max(c) min(c) a h112 e112 b h212 e212 c h312 e312 d h412 e412 select a1,a2,b, max(c) from t1 where (b = 'b') group by a1,a2; a1 a2 b max(c) a a b h112 a b b p122 b a b h212 b b b p222 c a b h312 c b b p322 d a b h412 d b b p422 select a1,a2,b,min(c),max(c) from t1 where (b = 'b') group by a1,a2; a1 a2 b min(c) max(c) a a b e112 h112 a b b m122 p122 b a b e212 h212 b b b m222 p222 c a b e312 h312 c b b m322 p322 d a b e412 h412 d b b m422 p422 select a1,a2, max(c) from t1 where (b = 'b') group by a1,a2; a1 a2 max(c) a a h112 a b p122 b a h212 b b p222 c a h312 c b p322 d a h412 d b p422 select a1,a2,b,max(c),min(c) from t2 where (a2 = 'a') and (b = 'b') group by a1; a1 a2 b max(c) min(c) a a b h112 e112 b a b h212 e212 c a b h312 e312 d a b h412 e412 e a b NULL NULL select a1,max(c),min(c) from t2 where (a2 = 'a') and (b = 'b') group by a1; a1 max(c) min(c) a h112 e112 b h212 e212 c h312 e312 d h412 e412 e NULL NULL select a1,a2,b, max(c) from t2 where (b = 'b') group by a1,a2; a1 a2 b max(c) a a b h112 a b b p122 b a b h212 b b b p222 c a b h312 c b b p322 d a b h412 d b b p422 e a b NULL select a1,a2,b,min(c),max(c) from t2 where (b = 'b') group by a1,a2; a1 a2 b min(c) max(c) a a b e112 h112 a b b m122 p122 b a b e212 h212 b b b m222 p222 c a b e312 h312 c b b m322 p322 d a b e412 h412 d b b m422 p422 e a b NULL NULL select a1,a2, max(c) from t2 where (b = 'b') group by a1,a2; a1 a2 max(c) a a h112 a b p122 b a h212 b b p222 c a h312 c b p322 d a h412 d b p422 e a NULL select a1,a2,b,max(c),min(c) from t3 where (a2 = 'a') and (b = 'b') group by a1; a1 a2 b max(c) min(c) a a b h112 e112 b a b h212 e212 c a b h312 e312 select a1,max(c),min(c) from t3 where (a2 = 'a') and (b = 'b') group by a1; a1 max(c) min(c) a h112 e112 b h212 e212 c h312 e312 explain select a1,a2,b,min(c) from t2 where (a2 = 'a') and b is NULL group by a1; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t2 range idx_t2_0,idx_t2_1,idx_t2_2 idx_t2_1 163 NULL 5 Using where; Using index for group-by explain select a1,a2,b,max(c) from t2 where (a2 = 'a') and b is NULL group by a1; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t2 range idx_t2_0,idx_t2_1,idx_t2_2 idx_t2_1 146 NULL 5 Using where; Using index for group-by explain select a1,a2,b,min(c) from t2 where b is NULL group by a1,a2; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t2 range idx_t2_1,idx_t2_2 idx_t2_1 163 NULL 10 Using where; Using index for group-by explain select a1,a2,b,max(c) from t2 where b is NULL group by a1,a2; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t2 range idx_t2_1,idx_t2_2 idx_t2_1 146 NULL 10 Using where; Using index for group-by explain select a1,a2,b,min(c),max(c) from t2 where b is NULL group by a1,a2; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t2 range idx_t2_1,idx_t2_2 idx_t2_1 163 NULL 10 Using where; Using index for group-by explain select a1,a2,b,min(c),max(c) from t2 where b is NULL group by a1,a2; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t2 range idx_t2_1,idx_t2_2 idx_t2_1 163 NULL 10 Using where; Using index for group-by select a1,a2,b,min(c) from t2 where (a2 = 'a') and b is NULL group by a1; a1 a2 b min(c) a a NULL a777 c a NULL c777 select a1,a2,b,max(c) from t2 where (a2 = 'a') and b is NULL group by a1; a1 a2 b max(c) a a NULL a999 c a NULL c999 select a1,a2,b,min(c) from t2 where b is NULL group by a1,a2; a1 a2 b min(c) a a NULL a777 c a NULL c777 select a1,a2,b,max(c) from t2 where b is NULL group by a1,a2; a1 a2 b max(c) a a NULL a999 c a NULL c999 select a1,a2,b,min(c),max(c) from t2 where b is NULL group by a1,a2; a1 a2 b min(c) max(c) a a NULL a777 a999 c a NULL c777 c999 select a1,a2,b,min(c),max(c) from t2 where b is NULL group by a1,a2; a1 a2 b min(c) max(c) a a NULL a777 a999 c a NULL c777 c999 explain select a1,a2,b, max(c) from t1 where (c > 'b1') group by a1,a2,b; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 range idx_t1_1,idx_t1_2 idx_t1_1 147 NULL # Using where; Using index for group-by explain select a1,a2,b,min(c),max(c) from t1 where (c > 'b1') group by a1,a2,b; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 range idx_t1_1,idx_t1_2 idx_t1_1 163 NULL 17 Using where; Using index for group-by explain select a1,a2,b, max(c) from t1 where (c > 'f123') group by a1,a2,b; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 range idx_t1_1,idx_t1_2 idx_t1_1 147 NULL 17 Using where; Using index for group-by explain select a1,a2,b,min(c),max(c) from t1 where (c > 'f123') group by a1,a2,b; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 range idx_t1_1,idx_t1_2 idx_t1_1 163 NULL 17 Using where; Using index for group-by explain select a1,a2,b, max(c) from t1 where (c < 'a0') group by a1,a2,b; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 range idx_t1_1,idx_t1_2 idx_t1_1 163 NULL 17 Using where; Using index for group-by explain select a1,a2,b,min(c),max(c) from t1 where (c < 'a0') group by a1,a2,b; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 range idx_t1_1,idx_t1_2 idx_t1_1 163 NULL 17 Using where; Using index for group-by explain select a1,a2,b, max(c) from t1 where (c < 'k321') group by a1,a2,b; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 range idx_t1_1,idx_t1_2 idx_t1_1 163 NULL 17 Using where; Using index for group-by explain select a1,a2,b,min(c),max(c) from t1 where (c < 'k321') group by a1,a2,b; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 range idx_t1_1,idx_t1_2 idx_t1_1 163 NULL 17 Using where; Using index for group-by explain select a1,a2,b, max(c) from t1 where (c < 'a0') or (c > 'b1') group by a1,a2,b; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 range idx_t1_1,idx_t1_2 idx_t1_1 163 NULL 17 Using where; Using index for group-by explain select a1,a2,b,min(c),max(c) from t1 where (c < 'a0') or (c > 'b1') group by a1,a2,b; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 range idx_t1_1,idx_t1_2 idx_t1_1 163 NULL 17 Using where; Using index for group-by explain select a1,a2,b, max(c) from t1 where (c > 'b1') or (c <= 'g1') group by a1,a2,b; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 range idx_t1_1,idx_t1_2 idx_t1_1 147 NULL 17 Using where; Using index for group-by explain select a1,a2,b,min(c),max(c) from t1 where (c > 'b1') or (c <= 'g1') group by a1,a2,b; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 range idx_t1_1,idx_t1_2 idx_t1_1 147 NULL 17 Using where; Using index for group-by explain select a1,a2,b,min(c),max(c) from t1 where (c > 'b111') and (c <= 'g112') group by a1,a2,b; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 range idx_t1_1,idx_t1_2 idx_t1_1 163 NULL 17 Using where; Using index for group-by explain select a1,a2,b,min(c),max(c) from t1 where (c < 'c5') or (c = 'g412') or (c = 'k421') group by a1,a2,b; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 range idx_t1_1,idx_t1_2 idx_t1_1 163 NULL 17 Using where; Using index for group-by explain select a1,a2,b,min(c),max(c) from t1 where ((c > 'b111') and (c <= 'g112')) or ((c > 'd000') and (c <= 'i110')) group by a1,a2,b; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 range idx_t1_1,idx_t1_2 idx_t1_1 163 NULL 17 Using where; Using index for group-by explain select a1,a2,b,min(c),max(c) from t1 where (c between 'b111' and 'g112') or (c between 'd000' and 'i110') group by a1,a2,b; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 range idx_t1_1,idx_t1_2 idx_t1_1 163 NULL 17 Using where; Using index for group-by explain select a1,a2,b, max(c) from t2 where (c > 'b1') group by a1,a2,b; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t2 range idx_t2_1,idx_t2_2 idx_t2_1 146 NULL # Using where; Using index for group-by explain select a1,a2,b,min(c),max(c) from t2 where (c > 'b1') group by a1,a2,b; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t2 range idx_t2_1,idx_t2_2 idx_t2_1 163 NULL # Using where; Using index for group-by explain select a1,a2,b, max(c) from t2 where (c > 'f123') group by a1,a2,b; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t2 range idx_t2_1,idx_t2_2 idx_t2_1 146 NULL # Using where; Using index for group-by explain select a1,a2,b,min(c),max(c) from t2 where (c > 'f123') group by a1,a2,b; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t2 range idx_t2_1,idx_t2_2 idx_t2_1 163 NULL # Using where; Using index for group-by explain select a1,a2,b, max(c) from t2 where (c < 'a0') group by a1,a2,b; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t2 range idx_t2_1,idx_t2_2 idx_t2_1 163 NULL # Using where; Using index for group-by explain select a1,a2,b,min(c),max(c) from t2 where (c < 'a0') group by a1,a2,b; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t2 range idx_t2_1,idx_t2_2 idx_t2_1 163 NULL # Using where; Using index for group-by explain select a1,a2,b, max(c) from t2 where (c < 'k321') group by a1,a2,b; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t2 range idx_t2_1,idx_t2_2 idx_t2_1 163 NULL # Using where; Using index for group-by explain select a1,a2,b,min(c),max(c) from t2 where (c < 'k321') group by a1,a2,b; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t2 range idx_t2_1,idx_t2_2 idx_t2_1 163 NULL # Using where; Using index for group-by explain select a1,a2,b, max(c) from t2 where (c < 'a0') or (c > 'b1') group by a1,a2,b; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t2 range idx_t2_1,idx_t2_2 idx_t2_1 163 NULL # Using where; Using index for group-by explain select a1,a2,b,min(c),max(c) from t2 where (c < 'a0') or (c > 'b1') group by a1,a2,b; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t2 range idx_t2_1,idx_t2_2 idx_t2_1 163 NULL # Using where; Using index for group-by explain select a1,a2,b, max(c) from t2 where (c > 'b1') or (c <= 'g1') group by a1,a2,b; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t2 range idx_t2_1,idx_t2_2 idx_t2_1 146 NULL # Using where; Using index for group-by explain select a1,a2,b,min(c),max(c) from t2 where (c > 'b1') or (c <= 'g1') group by a1,a2,b; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t2 range idx_t2_1,idx_t2_2 idx_t2_1 163 NULL # Using where; Using index for group-by explain select a1,a2,b,min(c),max(c) from t2 where (c > 'b111') and (c <= 'g112') group by a1,a2,b; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t2 range idx_t2_1,idx_t2_2 idx_t2_1 163 NULL # Using where; Using index for group-by explain select a1,a2,b,min(c),max(c) from t2 where (c < 'c5') or (c = 'g412') or (c = 'k421') group by a1,a2,b; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t2 range idx_t2_1,idx_t2_2 idx_t2_1 163 NULL # Using where; Using index for group-by explain select a1,a2,b,min(c),max(c) from t2 where ((c > 'b111') and (c <= 'g112')) or ((c > 'd000') and (c <= 'i110')) group by a1,a2,b; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t2 range idx_t2_1,idx_t2_2 idx_t2_1 163 NULL # Using where; Using index for group-by select a1,a2,b, max(c) from t1 where (c > 'b1') group by a1,a2,b; a1 a2 b max(c) a a a d111 a a b h112 a b a l121 a b b p122 b a a d211 b a b h212 b b a l221 b b b p222 c a a d311 c a b h312 c b a l321 c b b p322 d a a d411 d a b h412 d b a l421 d b b p422 select a1,a2,b,min(c),max(c) from t1 where (c > 'b1') group by a1,a2,b; a1 a2 b min(c) max(c) a a a b111 d111 a a b e112 h112 a b a i121 l121 a b b m122 p122 b a a b211 d211 b a b e212 h212 b b a i221 l221 b b b m222 p222 c a a b311 d311 c a b e312 h312 c b a i321 l321 c b b m322 p322 d a a b411 d411 d a b e412 h412 d b a i421 l421 d b b m422 p422 select a1,a2,b, max(c) from t1 where (c > 'f123') group by a1,a2,b; a1 a2 b max(c) a a b h112 a b a l121 a b b p122 b a b h212 b b a l221 b b b p222 c a b h312 c b a l321 c b b p322 d a b h412 d b a l421 d b b p422 select a1,a2,b,min(c),max(c) from t1 where (c > 'f123') group by a1,a2,b; a1 a2 b min(c) max(c) a a b g112 h112 a b a i121 l121 a b b m122 p122 b a b f212 h212 b b a i221 l221 b b b m222 p222 c a b f312 h312 c b a i321 l321 c b b m322 p322 d a b f412 h412 d b a i421 l421 d b b m422 p422 select a1,a2,b, max(c) from t1 where (c < 'a0') group by a1,a2,b; a1 a2 b max(c) select a1,a2,b,min(c),max(c) from t1 where (c < 'a0') group by a1,a2,b; a1 a2 b min(c) max(c) select a1,a2,b, max(c) from t1 where (c < 'k321') group by a1,a2,b; a1 a2 b max(c) a a a d111 a a b h112 a b a k121 b a a d211 b a b h212 b b a k221 c a a d311 c a b h312 c b a j321 d a a d411 d a b h412 d b a j421 select a1,a2,b,min(c),max(c) from t1 where (c < 'k321') group by a1,a2,b; a1 a2 b min(c) max(c) a a a a111 d111 a a b e112 h112 a b a i121 k121 b a a a211 d211 b a b e212 h212 b b a i221 k221 c a a a311 d311 c a b e312 h312 c b a i321 j321 d a a a411 d411 d a b e412 h412 d b a i421 j421 select a1,a2,b, max(c) from t1 where (c < 'a0') or (c > 'b1') group by a1,a2,b; a1 a2 b max(c) a a a d111 a a b h112 a b a l121 a b b p122 b a a d211 b a b h212 b b a l221 b b b p222 c a a d311 c a b h312 c b a l321 c b b p322 d a a d411 d a b h412 d b a l421 d b b p422 select a1,a2,b,min(c),max(c) from t1 where (c < 'a0') or (c > 'b1') group by a1,a2,b; a1 a2 b min(c) max(c) a a a b111 d111 a a b e112 h112 a b a i121 l121 a b b m122 p122 b a a b211 d211 b a b e212 h212 b b a i221 l221 b b b m222 p222 c a a b311 d311 c a b e312 h312 c b a i321 l321 c b b m322 p322 d a a b411 d411 d a b e412 h412 d b a i421 l421 d b b m422 p422 select a1,a2,b, max(c) from t1 where (c > 'b1') or (c <= 'g1') group by a1,a2,b; a1 a2 b max(c) a a a d111 a a b h112 a b a l121 a b b p122 b a a d211 b a b h212 b b a l221 b b b p222 c a a d311 c a b h312 c b a l321 c b b p322 d a a d411 d a b h412 d b a l421 d b b p422 select a1,a2,b,min(c),max(c) from t1 where (c > 'b1') or (c <= 'g1') group by a1,a2,b; a1 a2 b min(c) max(c) a a a a111 d111 a a b e112 h112 a b a i121 l121 a b b m122 p122 b a a a211 d211 b a b e212 h212 b b a i221 l221 b b b m222 p222 c a a a311 d311 c a b e312 h312 c b a i321 l321 c b b m322 p322 d a a a411 d411 d a b e412 h412 d b a i421 l421 d b b m422 p422 select a1,a2,b,min(c),max(c) from t1 where (c > 'b111') and (c <= 'g112') group by a1,a2,b; a1 a2 b min(c) max(c) a a a c111 d111 a a b e112 g112 b a a b211 d211 b a b e212 f212 c a a b311 d311 c a b e312 f312 d a a b411 d411 d a b e412 f412 select a1,a2,b,min(c),max(c) from t1 where (c < 'c5') or (c = 'g412') or (c = 'k421') group by a1,a2,b; a1 a2 b min(c) max(c) a a a a111 c111 b a a a211 c211 c a a a311 c311 d a a a411 c411 d a b g412 g412 d b a k421 k421 select a1,a2,b,min(c),max(c) from t1 where ((c > 'b111') and (c <= 'g112')) or ((c > 'd000') and (c <= 'i110')) group by a1,a2,b; a1 a2 b min(c) max(c) a a a c111 d111 a a b e112 h112 b a a b211 d211 b a b e212 h212 c a a b311 d311 c a b e312 h312 d a a b411 d411 d a b e412 h412 select a1,a2,b,min(c),max(c) from t1 where (c between 'b111' and 'g112') or (c between 'd000' and 'i110') group by a1,a2,b; a1 a2 b min(c) max(c) a a a b111 d111 a a b e112 h112 b a a b211 d211 b a b e212 h212 c a a b311 d311 c a b e312 h312 d a a b411 d411 d a b e412 h412 select a1,a2,b, max(c) from t2 where (c > 'b1') group by a1,a2,b; a1 a2 b max(c) a a a d111 a a b h112 a b a l121 a b b p122 b a a d211 b a b h212 b b a l221 b b b p222 c a NULL c999 c a a d311 c a b h312 c b a l321 c b b p322 d a a d411 d a b h412 d b a l421 d b b p422 select a1,a2,b,min(c),max(c) from t2 where (c > 'b1') group by a1,a2,b; a1 a2 b min(c) max(c) a a a b111 d111 a a b e112 h112 a b a i121 l121 a b b m122 p122 b a a b211 d211 b a b e212 h212 b b a i221 l221 b b b m222 p222 c a NULL c777 c999 c a a b311 d311 c a b e312 h312 c b a i321 l321 c b b m322 p322 d a a b411 d411 d a b e412 h412 d b a i421 l421 d b b m422 p422 select a1,a2,b, max(c) from t2 where (c > 'f123') group by a1,a2,b; a1 a2 b max(c) a a b h112 a b a l121 a b b p122 b a b h212 b b a l221 b b b p222 c a b h312 c b a l321 c b b p322 d a b h412 d b a l421 d b b p422 select a1,a2,b,min(c),max(c) from t2 where (c > 'f123') group by a1,a2,b; a1 a2 b min(c) max(c) a a b g112 h112 a b a i121 l121 a b b m122 p122 b a b f212 h212 b b a i221 l221 b b b m222 p222 c a b f312 h312 c b a i321 l321 c b b m322 p322 d a b f412 h412 d b a i421 l421 d b b m422 p422 select a1,a2,b, max(c) from t2 where (c < 'a0') group by a1,a2,b; a1 a2 b max(c) select a1,a2,b,min(c),max(c) from t2 where (c < 'a0') group by a1,a2,b; a1 a2 b min(c) max(c) select a1,a2,b, max(c) from t2 where (c < 'k321') group by a1,a2,b; a1 a2 b max(c) a a NULL a999 a a a d111 a a b h112 a b a k121 b a a d211 b a b h212 b b a k221 c a NULL c999 c a a d311 c a b h312 c b a j321 d a a d411 d a b h412 d b a j421 select a1,a2,b,min(c),max(c) from t2 where (c < 'k321') group by a1,a2,b; a1 a2 b min(c) max(c) a a NULL a777 a999 a a a a111 d111 a a b e112 h112 a b a i121 k121 b a a a211 d211 b a b e212 h212 b b a i221 k221 c a NULL c777 c999 c a a a311 d311 c a b e312 h312 c b a i321 j321 d a a a411 d411 d a b e412 h412 d b a i421 j421 select a1,a2,b, max(c) from t2 where (c < 'a0') or (c > 'b1') group by a1,a2,b; a1 a2 b max(c) a a a d111 a a b h112 a b a l121 a b b p122 b a a d211 b a b h212 b b a l221 b b b p222 c a NULL c999 c a a d311 c a b h312 c b a l321 c b b p322 d a a d411 d a b h412 d b a l421 d b b p422 select a1,a2,b,min(c),max(c) from t2 where (c < 'a0') or (c > 'b1') group by a1,a2,b; a1 a2 b min(c) max(c) a a a b111 d111 a a b e112 h112 a b a i121 l121 a b b m122 p122 b a a b211 d211 b a b e212 h212 b b a i221 l221 b b b m222 p222 c a NULL c777 c999 c a a b311 d311 c a b e312 h312 c b a i321 l321 c b b m322 p322 d a a b411 d411 d a b e412 h412 d b a i421 l421 d b b m422 p422 select a1,a2,b, max(c) from t2 where (c > 'b1') or (c <= 'g1') group by a1,a2,b; a1 a2 b max(c) a a NULL a999 a a a d111 a a b h112 a b a l121 a b b p122 b a a d211 b a b h212 b b a l221 b b b p222 c a NULL c999 c a a d311 c a b h312 c b a l321 c b b p322 d a a d411 d a b h412 d b a l421 d b b p422 select a1,a2,b,min(c),max(c) from t2 where (c > 'b1') or (c <= 'g1') group by a1,a2,b; a1 a2 b min(c) max(c) a a NULL a777 a999 a a a a111 d111 a a b e112 h112 a b a i121 l121 a b b m122 p122 b a a a211 d211 b a b e212 h212 b b a i221 l221 b b b m222 p222 c a NULL c777 c999 c a a a311 d311 c a b e312 h312 c b a i321 l321 c b b m322 p322 d a a a411 d411 d a b e412 h412 d b a i421 l421 d b b m422 p422 select a1,a2,b,min(c),max(c) from t2 where (c > 'b111') and (c <= 'g112') group by a1,a2,b; a1 a2 b min(c) max(c) a a a c111 d111 a a b e112 g112 b a a b211 d211 b a b e212 f212 c a NULL c777 c999 c a a b311 d311 c a b e312 f312 d a a b411 d411 d a b e412 f412 select a1,a2,b,min(c),max(c) from t2 where (c < 'c5') or (c = 'g412') or (c = 'k421') group by a1,a2,b; a1 a2 b min(c) max(c) a a NULL a777 a999 a a a a111 c111 b a a a211 c211 c a a a311 c311 d a a a411 c411 d a b g412 g412 d b a k421 k421 select a1,a2,b,min(c),max(c) from t2 where ((c > 'b111') and (c <= 'g112')) or ((c > 'd000') and (c <= 'i110')) group by a1,a2,b; a1 a2 b min(c) max(c) a a a c111 d111 a a b e112 h112 b a a b211 d211 b a b e212 h212 c a NULL c777 c999 c a a b311 d311 c a b e312 h312 d a a b411 d411 d a b e412 h412 explain select a1,a2,b,min(c),max(c) from t1 where exists ( select * from t2 where t2.c = t1.c ) group by a1,a2,b; id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t1 index idx_t1_1,idx_t1_2 idx_t1_1 163 NULL 128 Using where; Using index 2 DEPENDENT SUBQUERY t2 index NULL idx_t2_1 163 NULL 164 Using where; Using index explain select a1,a2,b,min(c),max(c) from t1 where exists ( select * from t2 where t2.c > 'b1' ) group by a1,a2,b; id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t1 range idx_t1_1,idx_t1_2 idx_t1_1 147 NULL 17 Using index for group-by 2 SUBQUERY t2 index NULL idx_t2_1 163 NULL 164 Using where; Using index explain select a1,a2,b,min(c),max(c) from t1 where (a1 >= 'c' or a2 < 'b') and (b > 'a') group by a1,a2,b; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 range idx_t1_0,idx_t1_1,idx_t1_2 idx_t1_1 147 NULL 17 Using where; Using index for group-by explain select a1,a2,b,min(c),max(c) from t1 where (a1 >= 'c' or a2 < 'b') and (c > 'b111') group by a1,a2,b; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 range idx_t1_0,idx_t1_1,idx_t1_2 idx_t1_1 163 NULL 17 Using where; Using index for group-by explain select a1,a2,b,min(c),max(c) from t1 where (a2 >= 'b') and (b = 'a') and (c > 'b111') group by a1,a2,b; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 range idx_t1_1,idx_t1_2 idx_t1_1 163 NULL 17 Using where; Using index for group-by explain select a1,a2,b,min(c) from t1 where ((a1 > 'a') or (a1 < '9')) and ((a2 >= 'b') and (a2 < 'z')) and (b = 'a') and ((c < 'h112') or (c = 'j121') or (c > 'k121' and c < 'm122') or (c > 'o122')) group by a1,a2,b; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 range idx_t1_0,idx_t1_1,idx_t1_2 idx_t1_1 163 NULL 14 Using where; Using index for group-by explain select a1,a2,b,min(c) from t1 where ((a1 > 'a') or (a1 < '9')) and ((a2 >= 'b') and (a2 < 'z')) and (b = 'a') and ((c = 'j121') or (c > 'k121' and c < 'm122') or (c > 'o122') or (c < 'h112') or (c = 'c111')) group by a1,a2,b; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 range idx_t1_0,idx_t1_1,idx_t1_2 idx_t1_1 163 NULL 14 Using where; Using index for group-by explain select a1,a2,b,min(c) from t1 where (a1 > 'a') and (a2 > 'a') and (b = 'c') group by a1,a2,b; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 range idx_t1_0,idx_t1_1,idx_t1_2 idx_t1_1 147 NULL 14 Using where; Using index for group-by explain select a1,a2,b,min(c) from t1 where (ord(a1) > 97) and (ord(a2) + ord(a1) > 194) and (b = 'c') group by a1,a2,b; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 range idx_t1_1,idx_t1_2 idx_t1_1 147 NULL 17 Using where; Using index for group-by explain select a1,a2,b,min(c),max(c) from t2 where (a1 >= 'c' or a2 < 'b') and (b > 'a') group by a1,a2,b; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t2 range idx_t2_0,idx_t2_1,idx_t2_2 idx_t2_1 163 NULL # Using where; Using index for group-by explain select a1,a2,b,min(c),max(c) from t2 where (a1 >= 'c' or a2 < 'b') and (c > 'b111') group by a1,a2,b; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t2 range idx_t2_0,idx_t2_1,idx_t2_2 idx_t2_1 163 NULL # Using where; Using index for group-by explain select a1,a2,b,min(c),max(c) from t2 where (a2 >= 'b') and (b = 'a') and (c > 'b111') group by a1,a2,b; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t2 range idx_t2_1,idx_t2_2 idx_t2_1 163 NULL # Using where; Using index for group-by explain select a1,a2,b,min(c) from t2 where ((a1 > 'a') or (a1 < '9')) and ((a2 >= 'b') and (a2 < 'z')) and (b = 'a') and ((c < 'h112') or (c = 'j121') or (c > 'k121' and c < 'm122') or (c > 'o122')) group by a1,a2,b; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t2 range idx_t2_0,idx_t2_1,idx_t2_2 idx_t2_1 163 NULL # Using where; Using index for group-by explain select a1,a2,b,min(c) from t2 where ((a1 > 'a') or (a1 < '9')) and ((a2 >= 'b') and (a2 < 'z')) and (b = 'a') and ((c = 'j121') or (c > 'k121' and c < 'm122') or (c > 'o122') or (c < 'h112') or (c = 'c111')) group by a1,a2,b; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t2 range idx_t2_0,idx_t2_1,idx_t2_2 idx_t2_1 163 NULL # Using where; Using index for group-by explain select a1,a2,b,min(c) from t2 where (a1 > 'a') and (a2 > 'a') and (b = 'c') group by a1,a2,b; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t2 range idx_t2_0,idx_t2_1,idx_t2_2 idx_t2_1 163 NULL # Using where; Using index for group-by select a1,a2,b,min(c),max(c) from t1 where (a1 >= 'c' or a2 < 'b') and (b > 'a') group by a1,a2,b; a1 a2 b min(c) max(c) a a b e112 h112 b a b e212 h212 c a b e312 h312 c b b m322 p322 d a b e412 h412 d b b m422 p422 select a1,a2,b,min(c),max(c) from t1 where (a1 >= 'c' or a2 < 'b') and (c > 'b111') group by a1,a2,b; a1 a2 b min(c) max(c) a a a c111 d111 a a b e112 h112 b a a b211 d211 b a b e212 h212 c a a b311 d311 c a b e312 h312 c b a i321 l321 c b b m322 p322 d a a b411 d411 d a b e412 h412 d b a i421 l421 d b b m422 p422 select a1,a2,b,min(c),max(c) from t1 where (a2 >= 'b') and (b = 'a') and (c > 'b111') group by a1,a2,b; a1 a2 b min(c) max(c) a b a i121 l121 b b a i221 l221 c b a i321 l321 d b a i421 l421 select a1,a2,b,min(c) from t1 where ((a1 > 'a') or (a1 < '9')) and ((a2 >= 'b') and (a2 < 'z')) and (b = 'a') and ((c < 'h112') or (c = 'j121') or (c > 'k121' and c < 'm122') or (c > 'o122')) group by a1,a2,b; a1 a2 b min(c) b b a k221 c b a k321 d b a k421 select a1,a2,b,min(c) from t1 where ((a1 > 'a') or (a1 < '9')) and ((a2 >= 'b') and (a2 < 'z')) and (b = 'a') and ((c = 'j121') or (c > 'k121' and c < 'm122') or (c > 'o122') or (c < 'h112') or (c = 'c111')) group by a1,a2,b; a1 a2 b min(c) b b a k221 c b a k321 d b a k421 select a1,a2,b,min(c) from t1 where (a1 > 'a') and (a2 > 'a') and (b = 'c') group by a1,a2,b; a1 a2 b min(c) select a1,a2,b,min(c) from t1 where (ord(a1) > 97) and (ord(a2) + ord(a1) > 194) and (b = 'c') group by a1,a2,b; a1 a2 b min(c) select a1,a2,b,min(c),max(c) from t2 where (a1 >= 'c' or a2 < 'b') and (b > 'a') group by a1,a2,b; a1 a2 b min(c) max(c) a a b e112 h112 b a b e212 h212 c a b e312 h312 c b b m322 p322 d a b e412 h412 d b b m422 p422 e a b NULL NULL select a1,a2,b,min(c),max(c) from t2 where (a1 >= 'c' or a2 < 'b') and (c > 'b111') group by a1,a2,b; a1 a2 b min(c) max(c) a a a c111 d111 a a b e112 h112 b a a b211 d211 b a b e212 h212 c a NULL c777 c999 c a a b311 d311 c a b e312 h312 c b a i321 l321 c b b m322 p322 d a a b411 d411 d a b e412 h412 d b a i421 l421 d b b m422 p422 select a1,a2,b,min(c),max(c) from t2 where (a2 >= 'b') and (b = 'a') and (c > 'b111') group by a1,a2,b; a1 a2 b min(c) max(c) a b a i121 l121 b b a i221 l221 c b a i321 l321 d b a i421 l421 select a1,a2,b,min(c) from t2 where ((a1 > 'a') or (a1 < '9')) and ((a2 >= 'b') and (a2 < 'z')) and (b = 'a') and ((c < 'h112') or (c = 'j121') or (c > 'k121' and c < 'm122') or (c > 'o122')) group by a1,a2,b; a1 a2 b min(c) b b a k221 c b a k321 d b a k421 select a1,a2,b,min(c) from t2 where ((a1 > 'a') or (a1 < '9')) and ((a2 >= 'b') and (a2 < 'z')) and (b = 'a') and ((c = 'j121') or (c > 'k121' and c < 'm122') or (c > 'o122') or (c < 'h112') or (c = 'c111')) group by a1,a2,b; a1 a2 b min(c) b b a k221 c b a k321 d b a k421 select a1,a2,b,min(c) from t2 where (a1 > 'a') and (a2 > 'a') and (b = 'c') group by a1,a2,b; a1 a2 b min(c) explain select a1,a2,b from t1 where (a1 >= 'c' or a2 < 'b') and (b > 'a') group by a1,a2,b; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 range idx_t1_0,idx_t1_1,idx_t1_2 idx_t1_1 147 NULL 17 Using where; Using index for group-by explain select a1,a2,b from t1 where (a2 >= 'b') and (b = 'a') group by a1,a2,b; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 range idx_t1_1,idx_t1_2 idx_t1_1 147 NULL 17 Using where; Using index for group-by explain select a1,a2,b,c from t1 where (a2 >= 'b') and (b = 'a') and (c = 'i121') group by a1,a2,b; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 range idx_t1_1,idx_t1_2 idx_t1_1 163 NULL 17 Using where; Using index for group-by explain select a1,a2,b from t1 where (a1 > 'a') and (a2 > 'a') and (b = 'c') group by a1,a2,b; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 range idx_t1_0,idx_t1_1,idx_t1_2 idx_t1_1 147 NULL 14 Using where; Using index for group-by explain select a1,a2,b from t2 where (a1 >= 'c' or a2 < 'b') and (b > 'a') group by a1,a2,b; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t2 range idx_t2_0,idx_t2_1,idx_t2_2 idx_t2_1 146 NULL # Using where; Using index for group-by explain select a1,a2,b from t2 where (a2 >= 'b') and (b = 'a') group by a1,a2,b; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t2 range idx_t2_1,idx_t2_2 idx_t2_1 146 NULL # Using where; Using index for group-by explain select a1,a2,b,c from t2 where (a2 >= 'b') and (b = 'a') and (c = 'i121') group by a1,a2,b; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t2 index idx_t2_1,idx_t2_2 idx_t2_1 163 NULL # Using where; Using index explain select a1,a2,b from t2 where (a1 > 'a') and (a2 > 'a') and (b = 'c') group by a1,a2,b; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t2 range idx_t2_0,idx_t2_1,idx_t2_2 idx_t2_1 146 NULL # Using where; Using index for group-by select a1,a2,b from t1 where (a1 >= 'c' or a2 < 'b') and (b > 'a') group by a1,a2,b; a1 a2 b a a b b a b c a b c b b d a b d b b select a1,a2,b from t1 where (a2 >= 'b') and (b = 'a') group by a1,a2,b; a1 a2 b a b a b b a c b a d b a select a1,a2,b,c from t1 where (a2 >= 'b') and (b = 'a') and (c = 'i121') group by a1,a2,b; a1 a2 b c a b a i121 select a1,a2,b from t1 where (a1 > 'a') and (a2 > 'a') and (b = 'c') group by a1,a2,b; a1 a2 b select a1,a2,b from t2 where (a1 >= 'c' or a2 < 'b') and (b > 'a') group by a1,a2,b; a1 a2 b a a b b a b c a b c b b d a b d b b e a b select a1,a2,b from t2 where (a2 >= 'b') and (b = 'a') group by a1,a2,b; a1 a2 b a b a b b a c b a d b a select a1,a2,b,c from t2 where (a2 >= 'b') and (b = 'a') and (c = 'i121') group by a1,a2,b; a1 a2 b c a b a i121 select a1,a2,b from t2 where (a1 > 'a') and (a2 > 'a') and (b = 'c') group by a1,a2,b; a1 a2 b explain select distinct a1,a2,b from t1; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 range idx_t1_1,idx_t1_2 idx_t1_1 147 NULL 17 Using index for group-by explain select distinct a1,a2,b from t1 where (a2 >= 'b') and (b = 'a'); id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 range idx_t1_1,idx_t1_2 idx_t1_1 147 NULL 17 Using where; Using index for group-by explain extended select distinct a1,a2,b,c from t1 where (a2 >= 'b') and (b = 'a') and (c = 'i121'); id select_type table type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t1 index idx_t1_1 idx_t1_1 163 NULL 128 50.78 Using where; Using index Warnings: Note 1003 /* select#1 */ select distinct `test`.`t1`.`a1` AS `a1`,`test`.`t1`.`a2` AS `a2`,`test`.`t1`.`b` AS `b`,`test`.`t1`.`c` AS `c` from `test`.`t1` where ((`test`.`t1`.`c` = 'i121') and (`test`.`t1`.`b` = 'a') and (`test`.`t1`.`a2` >= 'b')) explain select distinct a1,a2,b from t1 where (a1 > 'a') and (a2 > 'a') and (b = 'c'); id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 range idx_t1_0,idx_t1_1,idx_t1_2 idx_t1_1 147 NULL 14 Using where; Using index for group-by explain select distinct b from t1 where (a2 >= 'b') and (b = 'a'); id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 index idx_t1_1,idx_t1_2 idx_t1_2 147 NULL 128 Using where; Using index explain select distinct a1,a2,b from t2; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t2 range idx_t2_1,idx_t2_2 idx_t2_1 146 NULL # Using index for group-by explain select distinct a1,a2,b from t2 where (a2 >= 'b') and (b = 'a'); id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t2 range idx_t2_1,idx_t2_2 idx_t2_1 146 NULL # Using where; Using index for group-by explain extended select distinct a1,a2,b,c from t2 where (a2 >= 'b') and (b = 'a') and (c = 'i121'); id select_type table type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t2 index idx_t2_1 idx_t2_1 163 NULL 164 50.61 Using where; Using index Warnings: Note 1003 /* select#1 */ select distinct `test`.`t2`.`a1` AS `a1`,`test`.`t2`.`a2` AS `a2`,`test`.`t2`.`b` AS `b`,`test`.`t2`.`c` AS `c` from `test`.`t2` where ((`test`.`t2`.`c` = 'i121') and (`test`.`t2`.`b` = 'a') and (`test`.`t2`.`a2` >= 'b')) explain select distinct a1,a2,b from t2 where (a1 > 'a') and (a2 > 'a') and (b = 'c'); id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t2 range idx_t2_0,idx_t2_1,idx_t2_2 idx_t2_1 146 NULL # Using where; Using index for group-by explain select distinct b from t2 where (a2 >= 'b') and (b = 'a'); id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t2 index idx_t2_1,idx_t2_2 idx_t2_2 146 NULL 164 Using where; Using index select distinct a1,a2,b from t1; a1 a2 b a a a a a b a b a a b b b a a b a b b b a b b b c a a c a b c b a c b b d a a d a b d b a d b b select distinct a1,a2,b from t1 where (a2 >= 'b') and (b = 'a'); a1 a2 b a b a b b a c b a d b a select distinct a1,a2,b,c from t1 where (a2 >= 'b') and (b = 'a') and (c = 'i121'); a1 a2 b c a b a i121 select distinct a1,a2,b from t1 where (a1 > 'a') and (a2 > 'a') and (b = 'c'); a1 a2 b select distinct b from t1 where (a2 >= 'b') and (b = 'a'); b a select distinct a1,a2,b from t2; a1 a2 b a a NULL a a a a a b a b a a b b b a a b a b b b a b b b c a NULL c a a c a b c b a c b b d a a d a b d b a d b b e a a e a b select distinct a1,a2,b from t2 where (a2 >= 'b') and (b = 'a'); a1 a2 b a b a b b a c b a d b a select distinct a1,a2,b,c from t2 where (a2 >= 'b') and (b = 'a') and (c = 'i121'); a1 a2 b c a b a i121 select distinct a1,a2,b from t2 where (a1 > 'a') and (a2 > 'a') and (b = 'c'); a1 a2 b select distinct b from t2 where (a2 >= 'b') and (b = 'a'); b a select distinct t_00.a1 from t1 t_00 where exists ( select * from t2 where a1 = t_00.a1 ); a1 a b c d select distinct a1,a1 from t1; a1 a1 a a b b c c d d select distinct a2,a1,a2,a1 from t1; a2 a1 a2 a1 a a a a b a b a a b a b b b b b a c a c b c b c a d a d b d b d select distinct t1.a1,t2.a1 from t1,t2; a1 a1 a a b a c a d a a b b b c b d b a c b c c c d c a d b d c d d d a e b e c e d e explain select distinct a1,a2,b from t1; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 range idx_t1_1,idx_t1_2 idx_t1_1 147 NULL 17 Using index for group-by explain select distinct a1,a2,b from t1 where (a2 >= 'b') and (b = 'a') group by a1,a2,b; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 range idx_t1_1,idx_t1_2 idx_t1_1 147 NULL 17 Using where; Using index for group-by explain select distinct a1,a2,b,c from t1 where (a2 >= 'b') and (b = 'a') and (c = 'i121') group by a1,a2,b; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 range idx_t1_1,idx_t1_2 idx_t1_1 163 NULL 17 Using where; Using index for group-by explain select distinct a1,a2,b from t1 where (a1 > 'a') and (a2 > 'a') and (b = 'c') group by a1,a2,b; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 range idx_t1_0,idx_t1_1,idx_t1_2 idx_t1_1 147 NULL 14 Using where; Using index for group-by explain select distinct b from t1 where (a2 >= 'b') and (b = 'a') group by a1,a2,b; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 range idx_t1_1,idx_t1_2 idx_t1_1 147 NULL 17 Using where; Using index for group-by; Using temporary; Using filesort explain select distinct a1,a2,b from t2; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t2 range idx_t2_1,idx_t2_2 idx_t2_1 146 NULL # Using index for group-by explain select distinct a1,a2,b from t2 where (a2 >= 'b') and (b = 'a') group by a1,a2,b; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t2 range idx_t2_1,idx_t2_2 idx_t2_1 146 NULL # Using where; Using index for group-by explain select distinct a1,a2,b,c from t2 where (a2 >= 'b') and (b = 'a') and (c = 'i121') group by a1,a2,b; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t2 index idx_t2_1,idx_t2_2 idx_t2_1 163 NULL # Using where; Using index explain select distinct a1,a2,b from t2 where (a1 > 'a') and (a2 > 'a') and (b = 'c') group by a1,a2,b; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t2 range idx_t2_0,idx_t2_1,idx_t2_2 idx_t2_1 146 NULL # Using where; Using index for group-by explain select distinct b from t2 where (a2 >= 'b') and (b = 'a') group by a1,a2,b; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t2 range idx_t2_1,idx_t2_2 idx_t2_1 146 NULL # Using where; Using index for group-by; Using temporary; Using filesort select distinct a1,a2,b from t1; a1 a2 b a a a a a b a b a a b b b a a b a b b b a b b b c a a c a b c b a c b b d a a d a b d b a d b b select distinct a1,a2,b from t1 where (a2 >= 'b') and (b = 'a') group by a1,a2,b; a1 a2 b a b a b b a c b a d b a select distinct a1,a2,b,c from t1 where (a2 >= 'b') and (b = 'a') and (c = 'i121') group by a1,a2,b; a1 a2 b c a b a i121 select distinct a1,a2,b from t1 where (a1 > 'a') and (a2 > 'a') and (b = 'c') group by a1,a2,b; a1 a2 b select distinct b from t1 where (a2 >= 'b') and (b = 'a') group by a1,a2,b; b a select distinct a1,a2,b from t2; a1 a2 b a a NULL a a a a a b a b a a b b b a a b a b b b a b b b c a NULL c a a c a b c b a c b b d a a d a b d b a d b b e a a e a b select distinct a1,a2,b from t2 where (a2 >= 'b') and (b = 'a') group by a1,a2,b; a1 a2 b a b a b b a c b a d b a select distinct a1,a2,b,c from t2 where (a2 >= 'b') and (b = 'a') and (c = 'i121') group by a1,a2,b; a1 a2 b c a b a i121 select distinct a1,a2,b from t2 where (a1 > 'a') and (a2 > 'a') and (b = 'c') group by a1,a2,b; a1 a2 b select distinct b from t2 where (a2 >= 'b') and (b = 'a') group by a1,a2,b; b a explain select count(distinct a1,a2,b) from t1 where (a2 >= 'b') and (b = 'a'); id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 range idx_t1_1,idx_t1_2 idx_t1_1 147 NULL 17 Using where; Using index for group-by explain select count(distinct a1,a2,b,c) from t1 where (a2 >= 'b') and (b = 'a') and (c = 'i121'); id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 range idx_t1_1 idx_t1_1 163 NULL 65 Using where; Using index for group-by (scanning) explain extended select count(distinct a1,a2,b) from t1 where (a1 > 'a') and (a2 > 'a') and (b = 'c'); id select_type table type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t1 range idx_t1_0,idx_t1_1,idx_t1_2 idx_t1_1 147 NULL 14 100.00 Using where; Using index for group-by Warnings: Note 1003 /* select#1 */ select count(distinct `test`.`t1`.`a1`,`test`.`t1`.`a2`,`test`.`t1`.`b`) AS `count(distinct a1,a2,b)` from `test`.`t1` where ((`test`.`t1`.`b` = 'c') and (`test`.`t1`.`a1` > 'a') and (`test`.`t1`.`a2` > 'a')) explain select count(distinct b) from t1 where (a2 >= 'b') and (b = 'a'); id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 index idx_t1_1,idx_t1_2 idx_t1_2 147 NULL 128 Using where; Using index explain extended select 98 + count(distinct a1,a2,b) from t1 where (a1 > 'a') and (a2 > 'a'); id select_type table type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t1 range idx_t1_0,idx_t1_1,idx_t1_2 idx_t1_1 147 NULL 14 100.00 Using where; Using index for group-by Warnings: Note 1003 /* select#1 */ select (98 + count(distinct `test`.`t1`.`a1`,`test`.`t1`.`a2`,`test`.`t1`.`b`)) AS `98 + count(distinct a1,a2,b)` from `test`.`t1` where ((`test`.`t1`.`a1` > 'a') and (`test`.`t1`.`a2` > 'a')) select count(distinct a1,a2,b) from t1 where (a2 >= 'b') and (b = 'a'); count(distinct a1,a2,b) 4 select count(distinct a1,a2,b,c) from t1 where (a2 >= 'b') and (b = 'a') and (c = 'i121'); count(distinct a1,a2,b,c) 1 select count(distinct a1,a2,b) from t1 where (a1 > 'a') and (a2 > 'a') and (b = 'c'); count(distinct a1,a2,b) 0 select count(distinct b) from t1 where (a2 >= 'b') and (b = 'a'); count(distinct b) 1 select 98 + count(distinct a1,a2,b) from t1 where (a1 > 'a') and (a2 > 'a'); 98 + count(distinct a1,a2,b) 104 explain select a1,a2,b, concat(min(c), max(c)) from t1 where a1 < 'd' group by a1,a2,b; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 range idx_t1_0,idx_t1_1,idx_t1_2 idx_t1_1 147 NULL 10 Using where; Using index for group-by explain select concat(a1,min(c)),b from t1 where a1 < 'd' group by a1,a2,b; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 range idx_t1_0,idx_t1_1,idx_t1_2 idx_t1_1 147 NULL 10 Using where; Using index for group-by explain select concat(a1,min(c)),b,max(c) from t1 where a1 < 'd' group by a1,a2,b; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 range idx_t1_0,idx_t1_1,idx_t1_2 idx_t1_1 147 NULL 10 Using where; Using index for group-by explain select concat(a1,a2),b,min(c),max(c) from t1 where a1 < 'd' group by a1,a2,b; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 range idx_t1_0,idx_t1_1,idx_t1_2 idx_t1_1 147 NULL 10 Using where; Using index for group-by explain select concat(ord(min(b)),ord(max(b))),min(b),max(b) from t1 group by a1,a2; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 range idx_t1_1,idx_t1_2 idx_t1_1 147 NULL 9 Using index for group-by select a1,a2,b, concat(min(c), max(c)) from t1 where a1 < 'd' group by a1,a2,b; a1 a2 b concat(min(c), max(c)) a a a a111d111 a a b e112h112 a b a i121l121 a b b m122p122 b a a a211d211 b a b e212h212 b b a i221l221 b b b m222p222 c a a a311d311 c a b e312h312 c b a i321l321 c b b m322p322 select concat(a1,min(c)),b from t1 where a1 < 'd' group by a1,a2,b; concat(a1,min(c)) b aa111 a ae112 b ai121 a am122 b ba211 a be212 b bi221 a bm222 b ca311 a ce312 b ci321 a cm322 b select concat(a1,min(c)),b,max(c) from t1 where a1 < 'd' group by a1,a2,b; concat(a1,min(c)) b max(c) aa111 a d111 ae112 b h112 ai121 a l121 am122 b p122 ba211 a d211 be212 b h212 bi221 a l221 bm222 b p222 ca311 a d311 ce312 b h312 ci321 a l321 cm322 b p322 select concat(a1,a2),b,min(c),max(c) from t1 where a1 < 'd' group by a1,a2,b; concat(a1,a2) b min(c) max(c) aa a a111 d111 aa b e112 h112 ab a i121 l121 ab b m122 p122 ba a a211 d211 ba b e212 h212 bb a i221 l221 bb b m222 p222 ca a a311 d311 ca b e312 h312 cb a i321 l321 cb b m322 p322 select concat(ord(min(b)),ord(max(b))),min(b),max(b) from t1 group by a1,a2; concat(ord(min(b)),ord(max(b))) min(b) max(b) 9798 a b 9798 a b 9798 a b 9798 a b 9798 a b 9798 a b 9798 a b 9798 a b explain select a1,a2,b,d,min(c),max(c) from t1 group by a1,a2,b; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 ALL idx_t1_1,idx_t1_2 NULL NULL NULL 128 Using temporary; Using filesort explain select a1,a2,b,d from t1 group by a1,a2,b; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 ALL idx_t1_1,idx_t1_2 NULL NULL NULL 128 Using temporary; Using filesort explain extended select a1,a2,min(b),max(b) from t1 where (a1 = 'b' or a1 = 'd' or a1 = 'a' or a1 = 'c') and (a2 > 'a') and (c > 'a111') group by a1,a2; id select_type table type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t1 range idx_t1_0,idx_t1_1,idx_t1_2 idx_t1_1 130 NULL 76 85.53 Using where; Using index Warnings: Note 1003 /* select#1 */ select `test`.`t1`.`a1` AS `a1`,`test`.`t1`.`a2` AS `a2`,min(`test`.`t1`.`b`) AS `min(b)`,max(`test`.`t1`.`b`) AS `max(b)` from `test`.`t1` where (((`test`.`t1`.`a1` = 'b') or (`test`.`t1`.`a1` = 'd') or (`test`.`t1`.`a1` = 'a') or (`test`.`t1`.`a1` = 'c')) and (`test`.`t1`.`a2` > 'a') and (`test`.`t1`.`c` > 'a111')) group by `test`.`t1`.`a1`,`test`.`t1`.`a2` explain extended select a1,a2,b,min(c),max(c) from t1 where (a1 = 'b' or a1 = 'd' or a1 = 'a' or a1 = 'c') and (a2 > 'a') and (d > 'xy2') group by a1,a2,b; id select_type table type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t1 ALL idx_t1_0,idx_t1_1,idx_t1_2 NULL NULL NULL 128 50.78 Using where; Using temporary; Using filesort Warnings: Note 1003 /* select#1 */ select `test`.`t1`.`a1` AS `a1`,`test`.`t1`.`a2` AS `a2`,`test`.`t1`.`b` AS `b`,min(`test`.`t1`.`c`) AS `min(c)`,max(`test`.`t1`.`c`) AS `max(c)` from `test`.`t1` where (((`test`.`t1`.`a1` = 'b') or (`test`.`t1`.`a1` = 'd') or (`test`.`t1`.`a1` = 'a') or (`test`.`t1`.`a1` = 'c')) and (`test`.`t1`.`a2` > 'a') and (`test`.`t1`.`d` > 'xy2')) group by `test`.`t1`.`a1`,`test`.`t1`.`a2`,`test`.`t1`.`b` explain extended select a1,a2,b,c from t1 where (a1 = 'b' or a1 = 'd' or a1 = 'a' or a1 = 'c') and (a2 > 'a') and (d > 'xy2') group by a1,a2,b,c; id select_type table type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t1 ALL idx_t1_0,idx_t1_1,idx_t1_2 NULL NULL NULL 128 50.78 Using where; Using temporary; Using filesort Warnings: Note 1003 /* select#1 */ select `test`.`t1`.`a1` AS `a1`,`test`.`t1`.`a2` AS `a2`,`test`.`t1`.`b` AS `b`,`test`.`t1`.`c` AS `c` from `test`.`t1` where (((`test`.`t1`.`a1` = 'b') or (`test`.`t1`.`a1` = 'd') or (`test`.`t1`.`a1` = 'a') or (`test`.`t1`.`a1` = 'c')) and (`test`.`t1`.`a2` > 'a') and (`test`.`t1`.`d` > 'xy2')) group by `test`.`t1`.`a1`,`test`.`t1`.`a2`,`test`.`t1`.`b`,`test`.`t1`.`c` explain select a1,a2,b,max(c),min(c) from t2 where (a2 = 'a') and (b = 'b') or (b < 'b') group by a1; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t2 index idx_t2_0,idx_t2_1,idx_t2_2 idx_t2_1 163 NULL 164 Using where; Using index explain extended select a1,a2,b from t1 where (a1 = 'b' or a1 = 'd' or a1 = 'a' or a1 = 'c') and (a2 > 'a') and (c > 'a111') group by a1,a2,b; id select_type table type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t1 range idx_t1_0,idx_t1_1,idx_t1_2 idx_t1_1 130 NULL 76 85.53 Using where; Using index Warnings: Note 1003 /* select#1 */ select `test`.`t1`.`a1` AS `a1`,`test`.`t1`.`a2` AS `a2`,`test`.`t1`.`b` AS `b` from `test`.`t1` where (((`test`.`t1`.`a1` = 'b') or (`test`.`t1`.`a1` = 'd') or (`test`.`t1`.`a1` = 'a') or (`test`.`t1`.`a1` = 'c')) and (`test`.`t1`.`a2` > 'a') and (`test`.`t1`.`c` > 'a111')) group by `test`.`t1`.`a1`,`test`.`t1`.`a2`,`test`.`t1`.`b` explain select a1,a2,min(b),c from t2 where (a2 = 'a') and (c = 'a111') group by a1; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t2 index idx_t2_0,idx_t2_1,idx_t2_2 idx_t2_1 163 NULL 164 Using where; Using index select a1,a2,min(b),c from t2 where (a2 = 'a') and (c = 'a111') group by a1; a1 a2 min(b) c a a a a111 explain select a1,a2,b,max(c),min(c) from t2 where (a2 = 'a') and (b = 'b') or (b = 'a') group by a1; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t2 index idx_t2_0,idx_t2_1,idx_t2_2 idx_t2_1 163 NULL 164 Using where; Using index explain select a1,a2,b,min(c),max(c) from t2 where (c > 'a000') and (c <= 'd999') and (c like '_8__') group by a1,a2,b; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t2 index idx_t2_1,idx_t2_2 idx_t2_1 163 NULL 164 Using where; Using index explain select a1, a2, b, c, min(d), max(d) from t1 group by a1,a2,b,c; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 ALL idx_t1_1 NULL NULL NULL 128 Using temporary; Using filesort explain select a1,a2,count(a2) from t1 group by a1,a2,b; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 index idx_t1_1,idx_t1_2 idx_t1_2 147 NULL 128 Using index explain extended select a1,a2,count(a2) from t1 where (a1 > 'a') group by a1,a2,b; id select_type table type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t1 index idx_t1_0,idx_t1_1,idx_t1_2 idx_t1_2 147 NULL 128 75.00 Using where; Using index Warnings: Note 1003 /* select#1 */ select `test`.`t1`.`a1` AS `a1`,`test`.`t1`.`a2` AS `a2`,count(`test`.`t1`.`a2`) AS `count(a2)` from `test`.`t1` where (`test`.`t1`.`a1` > 'a') group by `test`.`t1`.`a1`,`test`.`t1`.`a2`,`test`.`t1`.`b` explain extended select sum(ord(a1)) from t1 where (a1 > 'a') group by a1,a2,b; id select_type table type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t1 index idx_t1_0,idx_t1_1,idx_t1_2 idx_t1_2 147 NULL 128 75.00 Using where; Using index Warnings: Note 1003 /* select#1 */ select sum(ord(`test`.`t1`.`a1`)) AS `sum(ord(a1))` from `test`.`t1` where (`test`.`t1`.`a1` > 'a') group by `test`.`t1`.`a1`,`test`.`t1`.`a2`,`test`.`t1`.`b` explain select distinct(a1) from t1 where ord(a2) = 98; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 index idx_t1_0,idx_t1_1,idx_t1_2 idx_t1_2 147 NULL 128 Using where; Using index select distinct(a1) from t1 where ord(a2) = 98; a1 a b c d explain select a1 from t1 where a2 = 'b' group by a1; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 range idx_t1_0,idx_t1_1,idx_t1_2 idx_t1_1 130 NULL 5 Using where; Using index for group-by select a1 from t1 where a2 = 'b' group by a1; a1 a b c d explain select distinct a1 from t1 where a2 = 'b'; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 range idx_t1_0,idx_t1_1,idx_t1_2 idx_t1_1 130 NULL 5 Using where; Using index for group-by select distinct a1 from t1 where a2 = 'b'; a1 a b c d drop table t1,t2,t3; create table t1 (c1 int not null,c2 int not null, primary key(c1,c2)); insert into t1 (c1,c2) values (10,1),(10,2),(10,3),(20,4),(20,5),(20,6),(30,7),(30,8),(30,9); select distinct c1, c2 from t1 order by c2; c1 c2 10 1 10 2 10 3 20 4 20 5 20 6 30 7 30 8 30 9 select c1,min(c2) as c2 from t1 group by c1 order by c2; c1 c2 10 1 20 4 30 7 select c1,c2 from t1 group by c1,c2 order by c2; c1 c2 10 1 10 2 10 3 20 4 20 5 20 6 30 7 30 8 30 9 drop table t1; CREATE TABLE t1 (a varchar(5), b int(11), PRIMARY KEY (a,b)); INSERT INTO t1 VALUES ('AA',1), ('AA',2), ('AA',3), ('BB',1), ('AA',4); OPTIMIZE TABLE t1; Table Op Msg_type Msg_text test.t1 optimize status OK SELECT a FROM t1 WHERE a='AA' GROUP BY a; a AA SELECT a FROM t1 WHERE a='BB' GROUP BY a; a BB EXPLAIN SELECT a FROM t1 WHERE a='AA' GROUP BY a; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 range PRIMARY PRIMARY 7 NULL 1 Using where; Using index for group-by EXPLAIN SELECT a FROM t1 WHERE a='BB' GROUP BY a; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 ref PRIMARY PRIMARY 7 const 1 Using where; Using index SELECT DISTINCT a FROM t1 WHERE a='BB'; a BB SELECT DISTINCT a FROM t1 WHERE a LIKE 'B%'; a BB SELECT a FROM t1 WHERE a LIKE 'B%' GROUP BY a; a BB DROP TABLE t1; CREATE TABLE t1 ( a int(11) NOT NULL DEFAULT '0', b varchar(16) COLLATE latin1_general_ci NOT NULL DEFAULT '', PRIMARY KEY (a,b) ) ENGINE=MyISAM DEFAULT CHARSET=latin1 COLLATE=latin1_general_ci; CREATE PROCEDURE a(x INT) BEGIN DECLARE rnd INT; DECLARE cnt INT; WHILE x > 0 DO SET rnd= x % 100; SET cnt = (SELECT COUNT(*) FROM t1 WHERE a = rnd); INSERT INTO t1(a,b) VALUES (rnd, CAST(cnt AS CHAR)); SET x= x - 1; END WHILE; END| CALL a(1000); SELECT a FROM t1 WHERE a=0; a 0 0 0 0 0 0 0 0 0 0 SELECT DISTINCT a FROM t1 WHERE a=0; a 0 SELECT COUNT(DISTINCT a) FROM t1 WHERE a=0; COUNT(DISTINCT a) 1 DROP TABLE t1; DROP PROCEDURE a; CREATE TABLE t1 (a varchar(64) NOT NULL default '', PRIMARY KEY(a)); INSERT INTO t1 (a) VALUES (''), ('CENTRAL'), ('EASTERN'), ('GREATER LONDON'), ('NORTH CENTRAL'), ('NORTH EAST'), ('NORTH WEST'), ('SCOTLAND'), ('SOUTH EAST'), ('SOUTH WEST'), ('WESTERN'); EXPLAIN SELECT DISTINCT a,a FROM t1 ORDER BY a; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 index PRIMARY PRIMARY 66 NULL 11 Using index SELECT DISTINCT a,a FROM t1 ORDER BY a; a a CENTRAL CENTRAL EASTERN EASTERN GREATER LONDON GREATER LONDON NORTH CENTRAL NORTH CENTRAL NORTH EAST NORTH EAST NORTH WEST NORTH WEST SCOTLAND SCOTLAND SOUTH EAST SOUTH EAST SOUTH WEST SOUTH WEST WESTERN WESTERN DROP TABLE t1; CREATE TABLE t1 (id1 INT, id2 INT); CREATE TABLE t2 (id2 INT, id3 INT, id5 INT); CREATE TABLE t3 (id3 INT, id4 INT); CREATE TABLE t4 (id4 INT); CREATE TABLE t5 (id5 INT, id6 INT); CREATE TABLE t6 (id6 INT); INSERT INTO t1 VALUES(1,1); INSERT INTO t2 VALUES(1,1,1); INSERT INTO t3 VALUES(1,1); INSERT INTO t4 VALUES(1); INSERT INTO t5 VALUES(1,1); INSERT INTO t6 VALUES(1); SELECT * FROM t1 NATURAL JOIN (t2 JOIN (t3 NATURAL JOIN t4, t5 NATURAL JOIN t6) ON (t3.id3 = t2.id3 AND t5.id5 = t2.id5)); id2 id1 id3 id5 id4 id3 id6 id5 1 1 1 1 1 1 1 1 SELECT * FROM t1 NATURAL JOIN (((t3 NATURAL JOIN t4) join (t5 NATURAL JOIN t6) on t3.id4 = t5.id5) JOIN t2 ON (t3.id3 = t2.id3 AND t5.id5 = t2.id5)); id2 id1 id4 id3 id6 id5 id3 id5 1 1 1 1 1 1 1 1 SELECT * FROM t1 NATURAL JOIN ((t3 join (t5 NATURAL JOIN t6)) JOIN t2); id2 id1 id3 id4 id6 id5 id3 id5 1 1 1 1 1 1 1 1 SELECT * FROM (t2 JOIN (t3 NATURAL JOIN t4, t5 NATURAL JOIN t6) ON (t3.id3 = t2.id3 AND t5.id5 = t2.id5)) NATURAL JOIN t1; id2 id3 id5 id4 id3 id6 id5 id1 1 1 1 1 1 1 1 1 SELECT * FROM (t2 JOIN ((t3 NATURAL JOIN t4) join (t5 NATURAL JOIN t6))) NATURAL JOIN t1; id2 id3 id5 id4 id3 id6 id5 id1 1 1 1 1 1 1 1 1 DROP TABLE t1,t2,t3,t4,t5,t6; CREATE TABLE t1 (a int, b int, PRIMARY KEY (a,b), KEY b (b)); INSERT INTO t1 VALUES (1,1),(1,2),(1,0),(1,3); explain SELECT MAX(b), a FROM t1 WHERE b < 2 AND a = 1 GROUP BY a; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 range PRIMARY,b PRIMARY 8 NULL 1 Using where; Using index for group-by SELECT MAX(b), a FROM t1 WHERE b < 2 AND a = 1 GROUP BY a; MAX(b) a 1 1 SELECT MIN(b), a FROM t1 WHERE b > 1 AND a = 1 GROUP BY a; MIN(b) a 2 1 CREATE TABLE t2 (a int, b int, c int, PRIMARY KEY (a,b,c)); INSERT INTO t2 SELECT a,b,b FROM t1; explain SELECT MIN(c) FROM t2 WHERE b = 2 and a = 1 and c > 1 GROUP BY a; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t2 range PRIMARY PRIMARY 12 NULL 1 Using where; Using index for group-by SELECT MIN(c) FROM t2 WHERE b = 2 and a = 1 and c > 1 GROUP BY a; MIN(c) 2 DROP TABLE t1,t2; CREATE TABLE t1 (a INT, b INT, INDEX (a,b)); INSERT INTO t1 (a, b) VALUES (1,1), (1,2), (1,3), (1,4), (1,5), (2,2), (2,3), (2,1), (3,1), (4,1), (4,2), (4,3), (4,4), (4,5), (4,6); EXPLAIN SELECT max(b), a FROM t1 GROUP BY a; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 range a a 5 NULL 8 Using index for group-by FLUSH STATUS; SELECT max(b), a FROM t1 GROUP BY a; max(b) a 5 1 3 2 1 3 6 4 SHOW STATUS LIKE 'handler_read__e%'; Variable_name Value Handler_read_key 8 Handler_read_next 0 EXPLAIN SELECT max(b), a FROM t1 GROUP BY a; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 range a a 5 NULL 8 Using index for group-by FLUSH STATUS; CREATE TABLE t2 SELECT max(b), a FROM t1 GROUP BY a; SHOW STATUS LIKE 'handler_read__e%'; Variable_name Value Handler_read_key 8 Handler_read_next 0 FLUSH STATUS; SELECT * FROM (SELECT max(b), a FROM t1 GROUP BY a) b; max(b) a 5 1 3 2 1 3 6 4 SHOW STATUS LIKE 'handler_read__e%'; Variable_name Value Handler_read_key 8 Handler_read_next 0 FLUSH STATUS; (SELECT max(b), a FROM t1 GROUP BY a) UNION (SELECT max(b), a FROM t1 GROUP BY a); max(b) a 5 1 3 2 1 3 6 4 SHOW STATUS LIKE 'handler_read__e%'; Variable_name Value Handler_read_key 16 Handler_read_next 0 EXPLAIN (SELECT max(b), a FROM t1 GROUP BY a) UNION (SELECT max(b), a FROM t1 GROUP BY a); id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t1 range a a 5 NULL 8 Using index for group-by 2 UNION t1 range a a 5 NULL 8 Using index for group-by NULL UNION RESULT ALL NULL NULL NULL NULL NULL Using temporary EXPLAIN SELECT (SELECT max(b) FROM t1 GROUP BY a HAVING a < 2) x FROM t1 AS t1_outer; id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t1_outer index NULL a 10 NULL 15 Using index 2 SUBQUERY t1 range a a 5 NULL 8 Using index for group-by EXPLAIN SELECT 1 FROM t1 AS t1_outer WHERE EXISTS (SELECT max(b) FROM t1 GROUP BY a HAVING a < 2); id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t1_outer index NULL a 10 NULL 15 Using index 2 SUBQUERY t1 range a a 5 NULL 8 Using index for group-by EXPLAIN SELECT 1 FROM t1 AS t1_outer WHERE (SELECT max(b) FROM t1 GROUP BY a HAVING a < 2) > 12; id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE 2 SUBQUERY t1 range a a 5 NULL 8 Using index for group-by EXPLAIN SELECT 1 FROM t1 AS t1_outer WHERE a IN (SELECT max(b) FROM t1 GROUP BY a HAVING a < 2); id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t1_outer index NULL a 10 NULL 15 Using where; Using index 2 SUBQUERY t1 range a a 5 NULL 8 Using index for group-by EXPLAIN SELECT 1 FROM t1 AS t1_outer GROUP BY a HAVING a > (SELECT max(b) FROM t1 GROUP BY a HAVING a < 2); id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t1_outer range a a 5 NULL 8 Using index for group-by 2 SUBQUERY t1 range a a 5 NULL 8 Using index for group-by EXPLAIN SELECT 1 FROM t1 AS t1_outer1 JOIN t1 AS t1_outer2 ON t1_outer1.a = (SELECT max(b) FROM t1 GROUP BY a HAVING a < 2) AND t1_outer1.b = t1_outer2.b; id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t1_outer1 ref a a 5 const 1 Using where; Using index 1 PRIMARY t1_outer2 index NULL a 10 NULL 15 Using where; Using index; Using join buffer (Block Nested Loop) 2 SUBQUERY t1 range a a 5 NULL 8 Using index for group-by EXPLAIN SELECT (SELECT (SELECT max(b) FROM t1 GROUP BY a HAVING a < 2) x FROM t1 AS t1_outer) x2 FROM t1 AS t1_outer2; id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t1_outer2 index NULL a 10 NULL 15 Using index 2 SUBQUERY t1_outer index NULL a 10 NULL 15 Using index 3 SUBQUERY t1 range a a 5 NULL 8 Using index for group-by CREATE TABLE t3 LIKE t1; FLUSH STATUS; INSERT INTO t3 SELECT a,MAX(b) FROM t1 GROUP BY a; SHOW STATUS LIKE 'handler_read__e%'; Variable_name Value Handler_read_key 8 Handler_read_next 0 DELETE FROM t3; FLUSH STATUS; INSERT INTO t3 SELECT 1, (SELECT MAX(b) FROM t1 GROUP BY a HAVING a < 2) FROM t1 LIMIT 1; SHOW STATUS LIKE 'handler_read__e%'; Variable_name Value Handler_read_key 8 Handler_read_next 0 FLUSH STATUS; DELETE FROM t3 WHERE (SELECT MAX(b) FROM t1 GROUP BY a HAVING a < 2) > 10000; SHOW STATUS LIKE 'handler_read__e%'; Variable_name Value Handler_read_key 8 Handler_read_next 0 FLUSH STATUS; DELETE FROM t3 WHERE (SELECT (SELECT MAX(b) FROM t1 GROUP BY a HAVING a < 2) x FROM t1) > 10000; ERROR 21000: Subquery returns more than 1 row SHOW STATUS LIKE 'handler_read__e%'; Variable_name Value Handler_read_key 8 Handler_read_next 1 DROP TABLE t1,t2,t3; CREATE TABLE t1 (a int, INDEX idx(a)); INSERT INTO t1 VALUES (4), (2), (1), (2), (4), (2), (1), (4), (4), (2), (1), (2), (2), (4), (1), (4); EXPLAIN SELECT DISTINCT(a) FROM t1; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 range idx idx 5 NULL 9 Using index for group-by SELECT DISTINCT(a) FROM t1; a 1 2 4 EXPLAIN SELECT SQL_BIG_RESULT DISTINCT(a) FROM t1; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 range idx idx 5 NULL 9 Using index for group-by SELECT SQL_BIG_RESULT DISTINCT(a) FROM t1; a 1 2 4 DROP TABLE t1; CREATE TABLE t1 (a INT, b INT); INSERT INTO t1 (a, b) VALUES (1,1), (1,2), (1,3); INSERT INTO t1 SELECT a + 1, b FROM t1; INSERT INTO t1 SELECT a + 2, b FROM t1; EXPLAIN SELECT a, MIN(b), MAX(b) FROM t1 GROUP BY a ORDER BY a DESC; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 ALL NULL NULL NULL NULL 12 Using temporary; Using filesort SELECT a, MIN(b), MAX(b) FROM t1 GROUP BY a ORDER BY a DESC; a MIN(b) MAX(b) 4 1 3 3 1 3 2 1 3 1 1 3 CREATE INDEX break_it ON t1 (a, b); EXPLAIN SELECT a, MIN(b), MAX(b) FROM t1 GROUP BY a ORDER BY a; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 range break_it break_it 10 NULL 7 Using index for group-by SELECT a, MIN(b), MAX(b) FROM t1 GROUP BY a ORDER BY a; a MIN(b) MAX(b) 1 1 3 2 1 3 3 1 3 4 1 3 EXPLAIN SELECT a, MIN(b), MAX(b) FROM t1 GROUP BY a ORDER BY a DESC; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 range break_it break_it 10 NULL 7 Using index for group-by; Using temporary; Using filesort SELECT a, MIN(b), MAX(b) FROM t1 GROUP BY a ORDER BY a DESC; a MIN(b) MAX(b) 4 1 3 3 1 3 2 1 3 1 1 3 EXPLAIN SELECT a, MIN(b), MAX(b), AVG(b) FROM t1 GROUP BY a ORDER BY a DESC; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 index break_it break_it 10 NULL 12 Using index SELECT a, MIN(b), MAX(b), AVG(b) FROM t1 GROUP BY a ORDER BY a DESC; a MIN(b) MAX(b) AVG(b) 4 1 3 2.0000 3 1 3 2.0000 2 1 3 2.0000 1 1 3 2.0000 DROP TABLE t1; create table t1 (a int, b int, primary key (a,b), key `index` (a,b)) engine=MyISAM; insert into t1 (a,b) values (0,0),(0,1),(0,2),(0,3),(0,4),(0,5),(0,6), (0,7),(0,8),(0,9),(0,10),(0,11),(0,12),(0,13), (1,0),(1,1),(1,2),(1,3),(1,4),(1,5),(1,6), (1,7),(1,8),(1,9),(1,10),(1,11),(1,12),(1,13), (2,0),(2,1),(2,2),(2,3),(2,4),(2,5),(2,6), (2,7),(2,8),(2,9),(2,10),(2,11),(2,12),(2,13), (3,0),(3,1),(3,2),(3,3),(3,4),(3,5),(3,6), (3,7),(3,8),(3,9),(3,10),(3,11),(3,12),(3,13); insert into t1 (a,b) select a, max(b)+1 from t1 where a = 0 group by a; select * from t1; a b 0 0 0 1 0 2 0 3 0 4 0 5 0 6 0 7 0 8 0 9 0 10 0 11 0 12 0 13 0 14 1 0 1 1 1 2 1 3 1 4 1 5 1 6 1 7 1 8 1 9 1 10 1 11 1 12 1 13 2 0 2 1 2 2 2 3 2 4 2 5 2 6 2 7 2 8 2 9 2 10 2 11 2 12 2 13 3 0 3 1 3 2 3 3 3 4 3 5 3 6 3 7 3 8 3 9 3 10 3 11 3 12 3 13 explain extended select sql_buffer_result a, max(b)+1 from t1 where a = 0 group by a; id select_type table type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t1 range PRIMARY,index PRIMARY 4 NULL 3 100.00 Using where; Using index for group-by; Using temporary Warnings: Note 1003 /* select#1 */ select sql_buffer_result `test`.`t1`.`a` AS `a`,(max(`test`.`t1`.`b`) + 1) AS `max(b)+1` from `test`.`t1` where (`test`.`t1`.`a` = 0) group by `test`.`t1`.`a` drop table t1; CREATE TABLE t1 (a int, b int, c int, d int, KEY foo (c,d,a,b), KEY bar (c,a,b,d)); INSERT INTO t1 VALUES (1, 1, 1, 1), (1, 1, 1, 2), (1, 1, 1, 3), (1, 1, 1, 4); INSERT INTO t1 SELECT * FROM t1; INSERT INTO t1 SELECT * FROM t1; INSERT INTO t1 SELECT a,b,c+1,d FROM t1; EXPLAIN SELECT DISTINCT c FROM t1 WHERE d=4; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 range foo,bar foo 10 NULL 9 Using where; Using index for group-by SELECT DISTINCT c FROM t1 WHERE d=4; c 1 2 DROP TABLE t1; # # Bug #45386: Wrong query result with MIN function in field list, # WHERE and GROUP BY clause # CREATE TABLE t (a INT, b INT, INDEX (a,b)); INSERT INTO t VALUES (2,0), (2,0), (2,1), (2,1); INSERT INTO t SELECT * FROM t; INSERT INTO t SELECT * FROM t; # test MIN #should use range with index for group by EXPLAIN SELECT a, MIN(b) FROM t WHERE b <> 0 GROUP BY a; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t range a a 10 NULL 9 Using where; Using index for group-by #should return 1 row SELECT a, MIN(b) FROM t WHERE b <> 0 GROUP BY a; a MIN(b) 2 1 # test MAX #should use range with index for group by EXPLAIN SELECT a, MAX(b) FROM t WHERE b <> 1 GROUP BY a; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t range a a 10 NULL 9 Using where; Using index for group-by #should return 1 row SELECT a, MAX(b) FROM t WHERE b <> 1 GROUP BY a; a MAX(b) 2 0 # test 3 ranges and use the middle one INSERT INTO t SELECT a, 2 FROM t; #should use range with index for group by EXPLAIN SELECT a, MAX(b) FROM t WHERE b > 0 AND b < 2 GROUP BY a; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t range a a 10 NULL 9 Using where; Using index for group-by #should return 1 row SELECT a, MAX(b) FROM t WHERE b > 0 AND b < 2 GROUP BY a; a MAX(b) 2 1 DROP TABLE t; # # Bug #48472: Loose index scan inappropriately chosen for some WHERE # conditions # CREATE TABLE t (a INT, b INT, INDEX (a,b)); INSERT INTO t VALUES (2,0), (2,0), (2,1), (2,1); INSERT INTO t SELECT * FROM t; SELECT a, MAX(b) FROM t WHERE 0=b+0 GROUP BY a; a MAX(b) 2 0 DROP TABLE t; End of 5.0 tests # # Bug #46607: Assertion failed: (cond_type == Item::FUNC_ITEM) results in # server crash # CREATE TABLE t (a INT, b INT, INDEX (a,b)); INSERT INTO t VALUES (2,0), (2,0), (2,1), (2,1); INSERT INTO t SELECT * FROM t; SELECT a, MAX(b) FROM t WHERE b GROUP BY a; a MAX(b) 2 1 DROP TABLE t; CREATE TABLE t1(a INT NOT NULL, b INT NOT NULL, KEY (b)); INSERT INTO t1 VALUES(1,1),(2,1); ANALYZE TABLE t1; Table Op Msg_type Msg_text test.t1 analyze status OK SELECT 1 AS c, b FROM t1 WHERE b IN (1,2) GROUP BY c, b; c b 1 1 SELECT a FROM t1 WHERE b=1; a 1 2 DROP TABLE t1; # # Bug#47762: Incorrect result from MIN() when WHERE tests NOT NULL column # for NULL # ## Test for NULLs allowed CREATE TABLE t1 ( a INT, KEY (a) ); INSERT INTO t1 VALUES (1), (2), (3); EXPLAIN SELECT MIN( a ) FROM t1 WHERE a = NULL; id select_type table type possible_keys key key_len ref rows Extra x x x x x x x x x Impossible WHERE noticed after reading const tables SELECT MIN( a ) FROM t1 WHERE a = NULL; MIN( a ) NULL EXPLAIN SELECT MIN( a ) FROM t1 WHERE a <> NULL; id select_type table type possible_keys key key_len ref rows Extra x x x x x x x x x Impossible WHERE noticed after reading const tables SELECT MIN( a ) FROM t1 WHERE a <> NULL; MIN( a ) NULL EXPLAIN SELECT MIN( a ) FROM t1 WHERE a > NULL; id select_type table type possible_keys key key_len ref rows Extra x x x x x x x x x Impossible WHERE noticed after reading const tables SELECT MIN( a ) FROM t1 WHERE a > NULL; MIN( a ) NULL EXPLAIN SELECT MIN( a ) FROM t1 WHERE a < NULL; id select_type table type possible_keys key key_len ref rows Extra x x x x x x x x x Impossible WHERE noticed after reading const tables SELECT MIN( a ) FROM t1 WHERE a < NULL; MIN( a ) NULL EXPLAIN SELECT MIN( a ) FROM t1 WHERE a <=> NULL; id select_type table type possible_keys key key_len ref rows Extra x x x x x x x x x No matching min/max row SELECT MIN( a ) FROM t1 WHERE a <=> NULL; MIN( a ) NULL EXPLAIN SELECT MIN( a ) FROM t1 WHERE a BETWEEN NULL AND 10; id select_type table type possible_keys key key_len ref rows Extra x x x x x x x x x Impossible WHERE noticed after reading const tables SELECT MIN( a ) FROM t1 WHERE a BETWEEN NULL AND 10; MIN( a ) NULL EXPLAIN SELECT MIN( a ) FROM t1 WHERE a BETWEEN NULL AND NULL; id select_type table type possible_keys key key_len ref rows Extra x x x x x x x x x Impossible WHERE noticed after reading const tables SELECT MIN( a ) FROM t1 WHERE a BETWEEN NULL AND NULL; MIN( a ) NULL EXPLAIN SELECT MIN( a ) FROM t1 WHERE a BETWEEN 10 AND NULL; id select_type table type possible_keys key key_len ref rows Extra x x x x x x x x x Impossible WHERE noticed after reading const tables SELECT MIN( a ) FROM t1 WHERE a BETWEEN 10 AND NULL; MIN( a ) NULL EXPLAIN SELECT MIN( a ) FROM t1 WHERE a = (SELECT a FROM t1 WHERE a < 0); id select_type table type possible_keys key key_len ref rows Extra x x x x x x x x x Impossible WHERE noticed after reading const tables x x x x x x x x x Using where; Using index SELECT MIN( a ) FROM t1 WHERE a = (SELECT a FROM t1 WHERE a < 0); MIN( a ) NULL EXPLAIN SELECT MIN( a ) FROM t1 WHERE a IS NULL; id select_type table type possible_keys key key_len ref rows Extra x x x x x x x x x No matching min/max row SELECT MIN( a ) FROM t1 WHERE a IS NULL; MIN( a ) NULL INSERT INTO t1 VALUES (NULL), (NULL); EXPLAIN SELECT MIN( a ) FROM t1 WHERE a = NULL; id select_type table type possible_keys key key_len ref rows Extra x x x x x x x x x Impossible WHERE noticed after reading const tables SELECT MIN( a ) FROM t1 WHERE a = NULL; MIN( a ) NULL EXPLAIN SELECT MIN( a ) FROM t1 WHERE a <> NULL; id select_type table type possible_keys key key_len ref rows Extra x x x x x x x x x Impossible WHERE noticed after reading const tables SELECT MIN( a ) FROM t1 WHERE a <> NULL; MIN( a ) NULL EXPLAIN SELECT MIN( a ) FROM t1 WHERE a > NULL; id select_type table type possible_keys key key_len ref rows Extra x x x x x x x x x Impossible WHERE noticed after reading const tables SELECT MIN( a ) FROM t1 WHERE a > NULL; MIN( a ) NULL EXPLAIN SELECT MIN( a ) FROM t1 WHERE a < NULL; id select_type table type possible_keys key key_len ref rows Extra x x x x x x x x x Impossible WHERE noticed after reading const tables SELECT MIN( a ) FROM t1 WHERE a < NULL; MIN( a ) NULL EXPLAIN SELECT MIN( a ) FROM t1 WHERE a <=> NULL; id select_type table type possible_keys key key_len ref rows Extra x x x x x x x x x Select tables optimized away SELECT MIN( a ) FROM t1 WHERE a <=> NULL; MIN( a ) NULL EXPLAIN SELECT MIN( a ) FROM t1 WHERE a BETWEEN NULL AND 10; id select_type table type possible_keys key key_len ref rows Extra x x x x x x x x x Impossible WHERE noticed after reading const tables SELECT MIN( a ) FROM t1 WHERE a BETWEEN NULL AND 10; MIN( a ) NULL EXPLAIN SELECT MIN( a ) FROM t1 WHERE a BETWEEN NULL AND NULL; id select_type table type possible_keys key key_len ref rows Extra x x x x x x x x x Impossible WHERE noticed after reading const tables SELECT MIN( a ) FROM t1 WHERE a BETWEEN NULL AND NULL; MIN( a ) NULL EXPLAIN SELECT MIN( a ) FROM t1 WHERE a BETWEEN 10 AND NULL; id select_type table type possible_keys key key_len ref rows Extra x x x x x x x x x Impossible WHERE noticed after reading const tables SELECT MIN( a ) FROM t1 WHERE a BETWEEN 10 AND NULL; MIN( a ) NULL EXPLAIN SELECT MIN( a ) FROM t1 WHERE a = (SELECT a FROM t1 WHERE a < 0); id select_type table type possible_keys key key_len ref rows Extra x x x x x x x x x Impossible WHERE noticed after reading const tables x x x x x x x x x Using where; Using index SELECT MIN( a ) FROM t1 WHERE a = (SELECT a FROM t1 WHERE a < 0); MIN( a ) NULL EXPLAIN SELECT MIN( a ) FROM t1 WHERE a IS NULL; id select_type table type possible_keys key key_len ref rows Extra x x x x x x x x x Select tables optimized away SELECT MIN( a ) FROM t1 WHERE a IS NULL; MIN( a ) NULL DROP TABLE t1; ## Test for NOT NULLs CREATE TABLE t1 ( a INT NOT NULL PRIMARY KEY); INSERT INTO t1 VALUES (1), (2), (3); # # NULL-safe operator test disabled for non-NULL indexed columns. # # See bugs # # - Bug#52173: Reading NULL value from non-NULL index gives # wrong result in embedded server # # - Bug#52174: Sometimes wrong plan when reading a MAX value from # non-NULL index # EXPLAIN SELECT MIN( a ) FROM t1 WHERE a = NULL; id select_type table type possible_keys key key_len ref rows Extra x x x x x x x x x Impossible WHERE noticed after reading const tables SELECT MIN( a ) FROM t1 WHERE a = NULL; MIN( a ) NULL EXPLAIN SELECT MIN( a ) FROM t1 WHERE a <> NULL; id select_type table type possible_keys key key_len ref rows Extra x x x x x x x x x Impossible WHERE noticed after reading const tables SELECT MIN( a ) FROM t1 WHERE a <> NULL; MIN( a ) NULL EXPLAIN SELECT MIN( a ) FROM t1 WHERE a > NULL; id select_type table type possible_keys key key_len ref rows Extra x x x x x x x x x Impossible WHERE noticed after reading const tables SELECT MIN( a ) FROM t1 WHERE a > NULL; MIN( a ) NULL EXPLAIN SELECT MIN( a ) FROM t1 WHERE a < NULL; id select_type table type possible_keys key key_len ref rows Extra x x x x x x x x x Impossible WHERE noticed after reading const tables SELECT MIN( a ) FROM t1 WHERE a < NULL; MIN( a ) NULL EXPLAIN SELECT MIN( a ) FROM t1 WHERE a BETWEEN NULL AND 10; id select_type table type possible_keys key key_len ref rows Extra x x x x x x x x x Impossible WHERE noticed after reading const tables SELECT MIN( a ) FROM t1 WHERE a BETWEEN NULL AND 10; MIN( a ) NULL EXPLAIN SELECT MIN( a ) FROM t1 WHERE a BETWEEN NULL AND NULL; id select_type table type possible_keys key key_len ref rows Extra x x x x x x x x x Impossible WHERE noticed after reading const tables SELECT MIN( a ) FROM t1 WHERE a BETWEEN NULL AND NULL; MIN( a ) NULL EXPLAIN SELECT MIN( a ) FROM t1 WHERE a BETWEEN 10 AND NULL; id select_type table type possible_keys key key_len ref rows Extra x x x x x x x x x Impossible WHERE noticed after reading const tables SELECT MIN( a ) FROM t1 WHERE a BETWEEN 10 AND NULL; MIN( a ) NULL EXPLAIN SELECT MIN( a ) FROM t1 WHERE a = (SELECT a FROM t1 WHERE a < 0); id select_type table type possible_keys key key_len ref rows Extra x x x x x x x x x Impossible WHERE noticed after reading const tables x x x x x x x x x Using where; Using index SELECT MIN( a ) FROM t1 WHERE a = (SELECT a FROM t1 WHERE a < 0); MIN( a ) NULL EXPLAIN SELECT MIN( a ) FROM t1 WHERE a IS NULL; id select_type table type possible_keys key key_len ref rows Extra x x x x x x x x x Impossible WHERE SELECT MIN( a ) FROM t1 WHERE a IS NULL; MIN( a ) NULL DROP TABLE t1; # # Bug#53859: Valgrind: opt_sum_query(TABLE_LIST*, List&, Item*) at # opt_sum.cc:305 # CREATE TABLE t1 ( a INT, KEY (a) ); INSERT INTO t1 VALUES (1), (2), (3); SELECT MIN( a ) AS min_a FROM t1 WHERE a > 1 AND a IS NULL ORDER BY min_a; min_a NULL DROP TABLE t1; End of 5.1 tests # # WL#3220 (Loose index scan for COUNT DISTINCT) # CREATE TABLE t1 (a INT, b INT, c INT, KEY (a,b)); INSERT INTO t1 VALUES (1,1,1), (1,2,1), (1,3,1), (1,4,1); INSERT INTO t1 SELECT a, b + 4, 1 FROM t1; INSERT INTO t1 SELECT a + 1, b, 1 FROM t1; CREATE TABLE t2 (a INT, b INT, c INT, d INT, e INT, f INT, KEY (a,b,c)); INSERT INTO t2 VALUES (1,1,1,1,1,1), (1,2,1,1,1,1), (1,3,1,1,1,1), (1,4,1,1,1,1); INSERT INTO t2 SELECT a, b + 4, c,d,e,f FROM t2; INSERT INTO t2 SELECT a + 1, b, c,d,e,f FROM t2; EXPLAIN SELECT COUNT(DISTINCT a) FROM t1; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 range a a 5 NULL 9 Using index for group-by SELECT COUNT(DISTINCT a) FROM t1; COUNT(DISTINCT a) 2 EXPLAIN SELECT COUNT(DISTINCT a,b) FROM t1; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 range a a 10 NULL 9 Using index for group-by SELECT COUNT(DISTINCT a,b) FROM t1; COUNT(DISTINCT a,b) 16 EXPLAIN SELECT COUNT(DISTINCT b,a) FROM t1; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 range a a 10 NULL 9 Using index for group-by SELECT COUNT(DISTINCT b,a) FROM t1; COUNT(DISTINCT b,a) 16 EXPLAIN SELECT COUNT(DISTINCT b) FROM t1; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 index a a 10 NULL 16 Using index SELECT COUNT(DISTINCT b) FROM t1; COUNT(DISTINCT b) 8 EXPLAIN SELECT COUNT(DISTINCT a) FROM t1 GROUP BY a; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 range a a 5 NULL 9 Using index for group-by SELECT COUNT(DISTINCT a) FROM t1 GROUP BY a; COUNT(DISTINCT a) 1 1 EXPLAIN SELECT COUNT(DISTINCT b) FROM t1 GROUP BY a; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 range a a 10 NULL 9 Using index for group-by SELECT COUNT(DISTINCT b) FROM t1 GROUP BY a; COUNT(DISTINCT b) 8 8 EXPLAIN SELECT COUNT(DISTINCT a) FROM t1 GROUP BY b; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 index a a 10 NULL 16 Using index; Using filesort SELECT COUNT(DISTINCT a) FROM t1 GROUP BY b; COUNT(DISTINCT a) 2 2 2 2 2 2 2 2 EXPLAIN SELECT DISTINCT COUNT(DISTINCT a) FROM t1; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 index a a 10 NULL 16 Using index SELECT DISTINCT COUNT(DISTINCT a) FROM t1; COUNT(DISTINCT a) 2 EXPLAIN SELECT COUNT(DISTINCT a, b + 0) FROM t1; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 index NULL a 10 NULL 16 Using index SELECT COUNT(DISTINCT a, b + 0) FROM t1; COUNT(DISTINCT a, b + 0) 16 EXPLAIN SELECT COUNT(DISTINCT a) FROM t1 HAVING COUNT(DISTINCT b) < 10; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 index NULL a 10 NULL 16 Using index SELECT COUNT(DISTINCT a) FROM t1 HAVING COUNT(DISTINCT b) < 10; COUNT(DISTINCT a) 2 EXPLAIN SELECT COUNT(DISTINCT a) FROM t1 HAVING COUNT(DISTINCT c) < 10; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 ALL NULL NULL NULL NULL 16 NULL SELECT COUNT(DISTINCT a) FROM t1 HAVING COUNT(DISTINCT c) < 10; COUNT(DISTINCT a) 2 EXPLAIN SELECT 1 FROM t1 HAVING COUNT(DISTINCT a) < 10; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 range a a 5 NULL 9 Using index for group-by SELECT 1 FROM t1 HAVING COUNT(DISTINCT a) < 10; 1 1 EXPLAIN SELECT 1 FROM t1 GROUP BY a HAVING COUNT(DISTINCT b) > 1; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 range a a 10 NULL 9 Using index for group-by SELECT 1 FROM t1 GROUP BY a HAVING COUNT(DISTINCT b) > 1; 1 1 1 EXPLAIN SELECT COUNT(DISTINCT t1_1.a) FROM t1 t1_1, t1 t1_2 GROUP BY t1_1.a; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1_1 index a a 10 NULL 16 Using index; Using temporary; Using filesort 1 SIMPLE t1_2 index NULL a 10 NULL 16 Using index; Using join buffer (Block Nested Loop) SELECT COUNT(DISTINCT t1_1.a) FROM t1 t1_1, t1 t1_2 GROUP BY t1_1.a; COUNT(DISTINCT t1_1.a) 1 1 EXPLAIN SELECT COUNT(DISTINCT a), 12 FROM t1; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 range a a 5 NULL 9 Using index for group-by SELECT COUNT(DISTINCT a), 12 FROM t1; COUNT(DISTINCT a) 12 2 12 EXPLAIN SELECT COUNT(DISTINCT a, b, c) FROM t2; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t2 range a a 15 NULL 9 Using index for group-by SELECT COUNT(DISTINCT a, b, c) FROM t2; COUNT(DISTINCT a, b, c) 16 EXPLAIN SELECT COUNT(DISTINCT a), SUM(DISTINCT a), AVG(DISTINCT a) FROM t2; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t2 range a a 5 NULL 9 Using index for group-by SELECT COUNT(DISTINCT a), SUM(DISTINCT a), AVG(DISTINCT a) FROM t2; COUNT(DISTINCT a) SUM(DISTINCT a) AVG(DISTINCT a) 2 3 1.5000 EXPLAIN SELECT COUNT(DISTINCT a), SUM(DISTINCT a), AVG(DISTINCT f) FROM t2; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t2 ALL NULL NULL NULL NULL 16 NULL SELECT COUNT(DISTINCT a), SUM(DISTINCT a), AVG(DISTINCT f) FROM t2; COUNT(DISTINCT a) SUM(DISTINCT a) AVG(DISTINCT f) 2 3 1.0000 EXPLAIN SELECT COUNT(DISTINCT a, b), COUNT(DISTINCT b, a) FROM t2; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t2 range a a 10 NULL 9 Using index for group-by SELECT COUNT(DISTINCT a, b), COUNT(DISTINCT b, a) FROM t2; COUNT(DISTINCT a, b) COUNT(DISTINCT b, a) 16 16 EXPLAIN SELECT COUNT(DISTINCT a, b), COUNT(DISTINCT b, f) FROM t2; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t2 ALL NULL NULL NULL NULL 16 NULL SELECT COUNT(DISTINCT a, b), COUNT(DISTINCT b, f) FROM t2; COUNT(DISTINCT a, b) COUNT(DISTINCT b, f) 16 8 EXPLAIN SELECT COUNT(DISTINCT a, b), COUNT(DISTINCT b, d) FROM t2; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t2 ALL NULL NULL NULL NULL 16 NULL SELECT COUNT(DISTINCT a, b), COUNT(DISTINCT b, d) FROM t2; COUNT(DISTINCT a, b) COUNT(DISTINCT b, d) 16 8 EXPLAIN SELECT a, c, COUNT(DISTINCT c, a, b) FROM t2 GROUP BY a, b, c; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t2 range a a 15 NULL 9 Using index for group-by SELECT a, c, COUNT(DISTINCT c, a, b) FROM t2 GROUP BY a, b, c; a c COUNT(DISTINCT c, a, b) 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 2 1 1 2 1 1 2 1 1 2 1 1 2 1 1 2 1 1 2 1 1 2 1 1 EXPLAIN SELECT COUNT(DISTINCT c, a, b) FROM t2 WHERE a > 5 AND b BETWEEN 10 AND 20 GROUP BY a, b, c; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t2 range a a 15 NULL 1 Using where; Using index for group-by SELECT COUNT(DISTINCT c, a, b) FROM t2 WHERE a > 5 AND b BETWEEN 10 AND 20 GROUP BY a, b, c; COUNT(DISTINCT c, a, b) EXPLAIN SELECT COUNT(DISTINCT b), SUM(DISTINCT b) FROM t2 WHERE a = 5 GROUP BY b; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t2 ref a a 5 const 1 Using where; Using index SELECT COUNT(DISTINCT b), SUM(DISTINCT b) FROM t2 WHERE a = 5 GROUP BY b; COUNT(DISTINCT b) SUM(DISTINCT b) EXPLAIN SELECT a, COUNT(DISTINCT b), SUM(DISTINCT b) FROM t2 GROUP BY a; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t2 range a a 10 NULL 9 Using index for group-by SELECT a, COUNT(DISTINCT b), SUM(DISTINCT b) FROM t2 GROUP BY a; a COUNT(DISTINCT b) SUM(DISTINCT b) 1 8 36 2 8 36 EXPLAIN SELECT COUNT(DISTINCT b), SUM(DISTINCT b) FROM t2 GROUP BY a; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t2 range a a 10 NULL 9 Using index for group-by SELECT COUNT(DISTINCT b), SUM(DISTINCT b) FROM t2 GROUP BY a; COUNT(DISTINCT b) SUM(DISTINCT b) 8 36 8 36 EXPLAIN SELECT COUNT(DISTINCT a, b) FROM t2 WHERE c = 13 AND d = 42; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t2 ALL a NULL NULL NULL 16 Using where SELECT COUNT(DISTINCT a, b) FROM t2 WHERE c = 13 AND d = 42; COUNT(DISTINCT a, b) 0 EXPLAIN SELECT a, COUNT(DISTINCT a), SUM(DISTINCT a) FROM t2 WHERE b = 13 AND c = 42 GROUP BY a; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t2 range a a 15 NULL 9 Using where; Using index for group-by SELECT a, COUNT(DISTINCT a), SUM(DISTINCT a) FROM t2 WHERE b = 13 AND c = 42 GROUP BY a; a COUNT(DISTINCT a) SUM(DISTINCT a) # This query could have been resolved using loose index scan since # the second part of count(..) is defined by a constant predicate EXPLAIN SELECT COUNT(DISTINCT a, b), SUM(DISTINCT a) FROM t2 WHERE b = 42; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t2 index NULL a 15 NULL 16 Using where; Using index SELECT COUNT(DISTINCT a, b), SUM(DISTINCT a) FROM t2 WHERE b = 42; COUNT(DISTINCT a, b) SUM(DISTINCT a) 0 NULL EXPLAIN SELECT SUM(DISTINCT a), MAX(b) FROM t2 GROUP BY a; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t2 index a a 15 NULL 16 Using index SELECT SUM(DISTINCT a), MAX(b) FROM t2 GROUP BY a; SUM(DISTINCT a) MAX(b) 1 8 2 8 EXPLAIN SELECT 42 * (a + c + COUNT(DISTINCT c, a, b)) FROM t2 GROUP BY a, b, c; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t2 range a a 15 NULL 9 Using index for group-by SELECT 42 * (a + c + COUNT(DISTINCT c, a, b)) FROM t2 GROUP BY a, b, c; 42 * (a + c + COUNT(DISTINCT c, a, b)) 126 126 126 126 126 126 126 126 168 168 168 168 168 168 168 168 EXPLAIN SELECT (SUM(DISTINCT a) + MAX(b)) FROM t2 GROUP BY a; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t2 index a a 15 NULL 16 Using index SELECT (SUM(DISTINCT a) + MAX(b)) FROM t2 GROUP BY a; (SUM(DISTINCT a) + MAX(b)) 9 10 DROP TABLE t1,t2; # end of WL#3220 tests # # Bug#50539: Wrong result when loose index scan is used for an aggregate # function with distinct # CREATE TABLE t1 ( f1 int(11) NOT NULL DEFAULT '0', f2 char(1) NOT NULL DEFAULT '', PRIMARY KEY (f1,f2) ) ; insert into t1 values(1,'A'),(1 , 'B'), (1, 'C'), (2, 'A'), (3, 'A'), (3, 'B'), (3, 'C'), (3, 'D'); SELECT f1, COUNT(DISTINCT f2) FROM t1 GROUP BY f1; f1 COUNT(DISTINCT f2) 1 3 2 1 3 4 explain SELECT f1, COUNT(DISTINCT f2) FROM t1 GROUP BY f1; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 range PRIMARY PRIMARY 5 NULL 9 Using index for group-by (scanning) drop table t1; # End of test#50539. # # Bug#17217128 - BAD INTERACTION BETWEEN MIN/MAX AND # "HAVING SUM(DISTINCT)": WRONG RESULTS. # CREATE TABLE t (a INT, b INT, KEY(a,b)); INSERT INTO t VALUES (1,1), (2,2), (3,3), (4,4), (1,0), (3,2), (4,5); set optimizer_trace_max_mem_size=1048576; set @@session.optimizer_trace='enabled=on'; set end_markers_in_json=on; ANALYZE TABLE t; Table Op Msg_type Msg_text test.t analyze status OK SELECT a, SUM(DISTINCT a), MIN(b) FROM t GROUP BY a; a SUM(DISTINCT a) MIN(b) 1 1 0 2 2 2 3 3 2 4 4 4 EXPLAIN SELECT a, SUM(DISTINCT a), MIN(b) FROM t GROUP BY a; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t index a a 10 NULL 7 Using index SELECT TRACE RLIKE 'have_both_agg_distinct_and_min_max' AS OK FROM INFORMATION_SCHEMA.OPTIMIZER_TRACE; OK 1 SELECT a, SUM(DISTINCT a), MAX(b) FROM t GROUP BY a; a SUM(DISTINCT a) MAX(b) 1 1 1 2 2 2 3 3 3 4 4 5 EXPLAIN SELECT a, SUM(DISTINCT a), MAX(b) FROM t GROUP BY a; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t index a a 10 NULL 7 Using index SELECT TRACE RLIKE 'have_both_agg_distinct_and_min_max' AS OK FROM INFORMATION_SCHEMA.OPTIMIZER_TRACE; OK 1 SELECT a, MAX(b) FROM t GROUP BY a HAVING SUM(DISTINCT a); a MAX(b) 1 1 2 2 3 3 4 5 EXPLAIN SELECT a, MAX(b) FROM t GROUP BY a HAVING SUM(DISTINCT a); id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t index a a 10 NULL 7 Using index SELECT TRACE RLIKE 'have_both_agg_distinct_and_min_max' AS OK FROM INFORMATION_SCHEMA.OPTIMIZER_TRACE; OK 1 SELECT SUM(DISTINCT a), MIN(b), MAX(b) FROM t; SUM(DISTINCT a) MIN(b) MAX(b) 10 0 5 EXPLAIN SELECT SUM(DISTINCT a), MIN(b), MAX(b) FROM t; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t index a a 10 NULL 7 Using index SELECT TRACE RLIKE 'have_both_agg_distinct_and_min_max' AS OK FROM INFORMATION_SCHEMA.OPTIMIZER_TRACE; OK 1 SELECT a, SUM(DISTINCT a), MIN(b), MAX(b) FROM t GROUP BY a; a SUM(DISTINCT a) MIN(b) MAX(b) 1 1 0 1 2 2 2 2 3 3 2 3 4 4 4 5 EXPLAIN SELECT a, SUM(DISTINCT a), MIN(b), MAX(b) FROM t GROUP BY a; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t index a a 10 NULL 7 Using index SELECT TRACE RLIKE 'have_both_agg_distinct_and_min_max' AS OK FROM INFORMATION_SCHEMA.OPTIMIZER_TRACE; OK 1 SET optimizer_trace_max_mem_size=DEFAULT; SET optimizer_trace=DEFAULT; SET end_markers_in_json=DEFAULT; DROP TABLE t; # # Bug#18109609: LOOSE INDEX SCAN IS NOT USED WHEN IT SHOULD # CREATE TABLE t1 ( id INT AUTO_INCREMENT PRIMARY KEY, c1 INT, c2 INT, KEY(c1,c2)); INSERT INTO t1(c1,c2) VALUES (1, 1), (1,2), (2,1), (2,2), (3,1), (3,2), (3,3), (4,1), (4,2), (4,3), (4,4), (4,5), (4,6), (4,7), (4,8), (4,9), (4,10), (4,11), (4,12), (4,13), (4,14), (4,15), (4,16), (4,17), (4,18), (4,19), (4,20),(5,5); EXPLAIN SELECT MAX(c2), c1 FROM t1 WHERE c1 = 4 GROUP BY c1; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 range c1 c1 5 NULL 7 Using where; Using index for group-by FLUSH STATUS; SELECT MAX(c2), c1 FROM t1 WHERE c1 = 4 GROUP BY c1; MAX(c2) c1 20 4 SHOW SESSION STATUS LIKE 'Handler_read%'; Variable_name Value Handler_read_first 0 Handler_read_key 3 Handler_read_last 1 Handler_read_next 0 Handler_read_prev 0 Handler_read_rnd 0 Handler_read_rnd_next 0 DROP TABLE t1; # End of test for Bug#18109609