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mariadb/mysql-test/r/group_min_max.result
unknown c9ef409150 Merge mysql.com:/home/timka/mysql/src/5.0-virgin 
into  mysql.com:/home/timka/mysql/src/5.0-bug-14920


sql/sql_class.cc:
  Auto merged
sql/sql_class.h:
  Auto merged
sql/sql_select.cc:
  Auto merged
mysql-test/r/group_min_max.result:
  Manually merged test cases.
mysql-test/t/group_min_max.test:
  Manually merged test cases.
2005-12-01 09:26:17 +02:00

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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(64) 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(64) 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 NULL 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 NULL 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 NULL 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 NULL 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 NULL 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 NULL 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 NULL 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 NULL 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 NULL 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 NULL 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 NULL 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 NULL 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 NULL 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 NULL 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 NULL 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 NULL 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 NULL 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 NULL 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 NULL 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 NULL 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 NULL 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 NULL 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 NULL 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 NULL 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 NULL 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 NULL 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 NULL 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 NULL 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 NULL 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 NULL 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 NULL 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 NULL 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 NULL 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 NULL 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 NULL 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 NULL 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 NULL 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 NULL 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 NULL 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 NULL 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 NULL 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 NULL 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 NULL 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 NULL 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 NULL 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 NULL 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 NULL 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 NULL 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 NULL 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 NULL 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 NULL 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 NULL 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 NULL 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 NULL 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 NULL 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 NULL 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 NULL 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 NULL 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 NULL 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 NULL 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 NULL 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 NULL 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 NULL 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 NULL 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 NULL 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 NULL 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 NULL 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 NULL 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 NULL 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 NULL 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');
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index NULL idx_t1_1 163 NULL 128 Using where; Using index
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 NULL 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 NULL 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 NULL 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');
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 index NULL idx_t2_1 163 NULL 164 Using where; Using index
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 NULL 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 NULL 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 NULL 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 NULL 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 NULL 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 NULL 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 NULL 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 NULL 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 NULL 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 index NULL idx_t1_2 147 NULL 128 Using where; Using index
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 index NULL idx_t1_1 163 NULL 128 Using where; Using index
explain 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 Extra
1 SIMPLE t1 index idx_t1_0,idx_t1_1,idx_t1_2 idx_t1_2 147 NULL 128 Using where; Using index
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 NULL idx_t1_2 147 NULL 128 Using where; Using index
explain select ord(a1) + 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 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 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 ord(a1) + count(distinct a1,a2,b) from t1 where (a1 > 'a') and (a2 > 'a');
ord(a1) + 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 NULL 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 NULL 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 NULL NULL NULL NULL 128 Using temporary; Using filesort
explain 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 Extra
1 SIMPLE t1 range idx_t1_0,idx_t1_1,idx_t1_2 idx_t1_1 130 NULL 76 Using where; Using index
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') and (d > 'xy2') group by a1,a2,b;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ALL idx_t1_0,idx_t1_1,idx_t1_2 NULL NULL NULL 128 Using where; Using temporary; Using filesort
explain 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 Extra
1 SIMPLE t1 ALL idx_t1_0,idx_t1_1,idx_t1_2 NULL NULL NULL 128 Using where; Using temporary; Using filesort
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 NULL idx_t2_1 163 NULL 164 Using where; Using index
explain 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 Extra
1 SIMPLE t1 range idx_t1_0,idx_t1_1,idx_t1_2 idx_t1_1 130 NULL 76 Using where; Using index
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 NULL 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 NULL 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 NULL 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 NULL 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 NULL idx_t1_1 163 NULL 128 Using index
explain 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 Extra
1 SIMPLE t1 index idx_t1_0,idx_t1_1,idx_t1_2 idx_t1_1 163 NULL 128 Using where; Using index
explain 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 Extra
1 SIMPLE t1 index idx_t1_0,idx_t1_1,idx_t1_2 idx_t1_1 163 NULL 128 Using where; Using index
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 NULL 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 NULL 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
create table t4 (
pk_col int auto_increment primary key, a1 char(64), a2 char(64), b char(16), c char(16) not null, d char(16), dummy char(64) default ' '
) engine=innodb;
insert into t4 (a1, a2, b, c, d, dummy) select * from t1;
create index idx12672_0 on t4 (a1);
create index idx12672_1 on t4 (a1,a2,b,c);
create index idx12672_2 on t4 (a1,a2,b);
analyze table t1;
Table Op Msg_type Msg_text
test.t1 analyze status Table is already up to date
select distinct a1 from t4 where pk_col not in (1,2,3,4);
a1
a
b
c
d
drop table t1,t2,t3,t4;
create table t1 (
a varchar(30), b varchar(30), primary key(a), key(b)
) engine=innodb;
select distinct a from t1;
a
drop table t1;
create table t1(a int, key(a)) engine=innodb;
insert into t1 values(1);
select a, count(a) from t1 group by a with rollup;
a count(a)
1 1
NULL 1
drop table t1;
create table t1 (f1 int, f2 char(1), primary key(f1,f2)) engine=innodb;
insert into t1 values ( 1,"e"),(2,"a"),( 3,"c"),(4,"d");
alter table t1 drop primary key, add primary key (f2, f1);
explain select distinct f1 a, f1 b from t1;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index NULL PRIMARY 5 NULL 4 Using index; Using temporary
explain select distinct f1, f2 from t1;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range NULL PRIMARY 5 NULL 3 Using index for group-by; Using temporary
drop table t1;
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;
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