mirror of
https://github.com/MariaDB/server.git
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fe03f6bbe0
- Renamed "Using join cache" to "Using join buffer". - "Using join buffer" is now printed on the last table that "reads" from the join buffer cache.
763 lines
26 KiB
Plaintext
763 lines
26 KiB
Plaintext
drop table if exists t0, t1, t2, t3, t4;
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create table t1 (oref int, grp int, ie int) ;
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insert into t1 (oref, grp, ie) values
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(1, 1, 1),
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(1, 1, 1),
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(1, 2, NULL),
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(2, 1, 3),
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(3, 1, 4),
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(3, 2, NULL);
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create table t2 (oref int, a int);
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insert into t2 values
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(1, 1),
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(2, 2),
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(3, 3),
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(4, NULL),
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(2, NULL);
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select a, oref, a in (select max(ie)
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from t1 where oref=t2.oref group by grp) Z from t2;
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a oref Z
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1 1 1
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2 2 0
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3 3 NULL
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NULL 4 0
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NULL 2 NULL
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explain extended
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select a, oref, a in (select max(ie)
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from t1 where oref=t2.oref group by grp) Z from t2;
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id select_type table type possible_keys key key_len ref rows filtered Extra
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1 PRIMARY t2 ALL NULL NULL NULL NULL 5 100.00
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2 DEPENDENT SUBQUERY t1 ALL NULL NULL NULL NULL 6 100.00 Using where; Using temporary; Using filesort
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Warnings:
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Note 1276 Field or reference 'test.t2.oref' of SELECT #2 was resolved in SELECT #1
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Note 1003 select `test`.`t2`.`a` AS `a`,`test`.`t2`.`oref` AS `oref`,<in_optimizer>(`test`.`t2`.`a`,<exists>(select max(`test`.`t1`.`ie`) AS `max(ie)` from `test`.`t1` where (`test`.`t1`.`oref` = `test`.`t2`.`oref`) group by `test`.`t1`.`grp` having trigcond((<cache>(`test`.`t2`.`a`) = <ref_null_helper>(max(`test`.`t1`.`ie`)))))) AS `Z` from `test`.`t2`
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explain extended
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select a, oref from t2
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where a in (select max(ie) from t1 where oref=t2.oref group by grp);
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id select_type table type possible_keys key key_len ref rows filtered Extra
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1 PRIMARY t2 ALL NULL NULL NULL NULL 5 100.00 Using where
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2 DEPENDENT SUBQUERY t1 ALL NULL NULL NULL NULL 6 100.00 Using where; Using temporary; Using filesort
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Warnings:
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Note 1276 Field or reference 'test.t2.oref' of SELECT #2 was resolved in SELECT #1
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Note 1003 select `test`.`t2`.`a` AS `a`,`test`.`t2`.`oref` AS `oref` from `test`.`t2` where <in_optimizer>(`test`.`t2`.`a`,<exists>(select max(`test`.`t1`.`ie`) AS `max(ie)` from `test`.`t1` where (`test`.`t1`.`oref` = `test`.`t2`.`oref`) group by `test`.`t1`.`grp` having (<cache>(`test`.`t2`.`a`) = <ref_null_helper>(max(`test`.`t1`.`ie`)))))
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select a, oref, a in (
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select max(ie) from t1 where oref=t2.oref group by grp union
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select max(ie) from t1 where oref=t2.oref group by grp
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) Z from t2;
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a oref Z
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1 1 1
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2 2 0
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3 3 NULL
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NULL 4 0
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NULL 2 NULL
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create table t3 (a int);
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insert into t3 values (NULL), (NULL);
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flush status;
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select a in (select max(ie) from t1 where oref=4 group by grp) from t3;
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a in (select max(ie) from t1 where oref=4 group by grp)
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0
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0
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show status like 'Handler_read_rnd_next';
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Variable_name Value
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Handler_read_rnd_next 11
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select ' ^ This must show 11' Z;
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Z
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^ This must show 11
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explain extended select a in (select max(ie) from t1 where oref=4 group by grp) from t3;
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id select_type table type possible_keys key key_len ref rows filtered Extra
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1 PRIMARY t3 ALL NULL NULL NULL NULL 2 100.00
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2 DEPENDENT SUBQUERY t1 ALL NULL NULL NULL NULL 6 100.00 Using where; Using temporary; Using filesort
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Warnings:
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Note 1003 select <in_optimizer>(`test`.`t3`.`a`,<exists>(select max(`test`.`t1`.`ie`) AS `max(ie)` from `test`.`t1` where (`test`.`t1`.`oref` = 4) group by `test`.`t1`.`grp` having trigcond((<cache>(`test`.`t3`.`a`) = <ref_null_helper>(max(`test`.`t1`.`ie`)))))) AS `a in (select max(ie) from t1 where oref=4 group by grp)` from `test`.`t3`
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drop table t1, t2, t3;
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create table t1 (a int, oref int, key(a));
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insert into t1 values
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(1, 1),
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(1, NULL),
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(2, 3),
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(2, NULL),
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(3, NULL);
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create table t2 (a int, oref int);
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insert into t2 values (1, 1), (2,2), (NULL, 3), (NULL, 4);
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select oref, a, a in (select a from t1 where oref=t2.oref) Z from t2;
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oref a Z
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1 1 1
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2 2 0
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3 NULL NULL
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4 NULL 0
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explain extended
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select oref, a, a in (select a from t1 where oref=t2.oref) Z from t2;
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id select_type table type possible_keys key key_len ref rows filtered Extra
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1 PRIMARY t2 ALL NULL NULL NULL NULL 4 100.00
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2 DEPENDENT SUBQUERY t1 index_subquery a a 5 func 2 100.00 Using where; Full scan on NULL key
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Warnings:
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Note 1276 Field or reference 'test.t2.oref' of SELECT #2 was resolved in SELECT #1
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Note 1003 select `test`.`t2`.`oref` AS `oref`,`test`.`t2`.`a` AS `a`,<in_optimizer>(`test`.`t2`.`a`,<exists>(<index_lookup>(<cache>(`test`.`t2`.`a`) in t1 on a checking NULL where (`test`.`t1`.`oref` = `test`.`t2`.`oref`) having trigcond(<is_not_null_test>(`test`.`t1`.`a`))))) AS `Z` from `test`.`t2`
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flush status;
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select oref, a from t2 where a in (select a from t1 where oref=t2.oref);
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oref a
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1 1
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show status like '%Handler_read_rnd_next';
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Variable_name Value
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Handler_read_rnd_next 5
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delete from t2;
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insert into t2 values (NULL, 0),(NULL, 0), (NULL, 0), (NULL, 0);
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flush status;
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select oref, a, a in (select a from t1 where oref=t2.oref) Z from t2;
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oref a Z
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0 NULL 0
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0 NULL 0
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0 NULL 0
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0 NULL 0
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show status like '%Handler_read%';
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Variable_name Value
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Handler_read_first 0
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Handler_read_key 0
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Handler_read_next 0
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Handler_read_prev 0
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Handler_read_rnd 0
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Handler_read_rnd_next 29
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select 'No key lookups, seq reads: 29= 5 reads from t2 + 4 * 6 reads from t1.' Z;
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Z
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No key lookups, seq reads: 29= 5 reads from t2 + 4 * 6 reads from t1.
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drop table t1, t2;
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create table t1 (a int, b int, primary key (a));
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insert into t1 values (1,1), (3,1),(100,1);
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create table t2 (a int, b int);
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insert into t2 values (1,1),(2,1),(NULL,1),(NULL,0);
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select a,b, a in (select a from t1 where t1.b = t2.b) Z from t2 ;
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a b Z
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1 1 1
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2 1 0
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NULL 1 NULL
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NULL 0 0
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drop table t1, t2;
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create table t1 (a int, b int, key(a));
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insert into t1 values
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(0,0),(1,1),(2,2),(3,3),(4,4),(5,5),(6,6),(7,7),(8,8),(9,9);
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create table t2 like t1;
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insert into t2 select * from t1;
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update t2 set b=1;
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create table t3 (a int, oref int);
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insert into t3 values (1, 1), (NULL,1), (NULL,0);
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select a, oref,
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t3.a in (select t1.a from t1, t2 where t1.b=t2.a and t2.b=t3.oref) Z
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from t3;
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a oref Z
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1 1 1
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NULL 1 NULL
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NULL 0 0
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explain extended
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select a, oref,
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t3.a in (select t1.a from t1, t2 where t1.b=t2.a and t2.b=t3.oref) Z
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from t3;
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id select_type table type possible_keys key key_len ref rows filtered Extra
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1 PRIMARY t3 ALL NULL NULL NULL NULL 3 100.00
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2 DEPENDENT SUBQUERY t1 ref_or_null a a 5 func 4 100.00 Using where; Full scan on NULL key
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2 DEPENDENT SUBQUERY t2 ref a a 5 test.t1.b 1 100.00 Using where
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Warnings:
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Note 1276 Field or reference 'test.t3.oref' of SELECT #2 was resolved in SELECT #1
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Note 1003 select `test`.`t3`.`a` AS `a`,`test`.`t3`.`oref` AS `oref`,<in_optimizer>(`test`.`t3`.`a`,<exists>(select 1 AS `Not_used` from `test`.`t1` join `test`.`t2` where ((`test`.`t2`.`a` = `test`.`t1`.`b`) and (`test`.`t2`.`b` = `test`.`t3`.`oref`) and trigcond(((<cache>(`test`.`t3`.`a`) = `test`.`t1`.`a`) or isnull(`test`.`t1`.`a`)))) having trigcond(<is_not_null_test>(`test`.`t1`.`a`)))) AS `Z` from `test`.`t3`
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drop table t1, t2, t3;
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create table t1 (a int NOT NULL, b int NOT NULL, key(a));
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insert into t1 values
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(0,0),(1,1),(2,2),(3,3),(4,4),(5,5),(6,6),(7,7),(8,8),(9,9);
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create table t2 like t1;
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insert into t2 select * from t1;
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update t2 set b=1;
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create table t3 (a int, oref int);
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insert into t3 values (1, 1), (NULL,1), (NULL,0);
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select a, oref,
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t3.a in (select t1.a from t1, t2 where t1.b=t2.a and t2.b=t3.oref) Z
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from t3;
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a oref Z
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1 1 1
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NULL 1 NULL
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NULL 0 0
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This must show a trig_cond:
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explain extended
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select a, oref,
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t3.a in (select t1.a from t1, t2 where t1.b=t2.a and t2.b=t3.oref) Z
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from t3;
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id select_type table type possible_keys key key_len ref rows filtered Extra
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1 PRIMARY t3 ALL NULL NULL NULL NULL 3 100.00
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2 DEPENDENT SUBQUERY t1 ref a a 4 func 2 100.00 Using where; Full scan on NULL key
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2 DEPENDENT SUBQUERY t2 ref a a 4 test.t1.b 1 100.00 Using where
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Warnings:
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Note 1276 Field or reference 'test.t3.oref' of SELECT #2 was resolved in SELECT #1
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Note 1003 select `test`.`t3`.`a` AS `a`,`test`.`t3`.`oref` AS `oref`,<in_optimizer>(`test`.`t3`.`a`,<exists>(select 1 AS `Not_used` from `test`.`t1` join `test`.`t2` where ((`test`.`t2`.`a` = `test`.`t1`.`b`) and (`test`.`t2`.`b` = `test`.`t3`.`oref`) and trigcond((<cache>(`test`.`t3`.`a`) = `test`.`t1`.`a`))))) AS `Z` from `test`.`t3`
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drop table t1,t2,t3;
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create table t1 (oref int, grp int);
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insert into t1 (oref, grp) values
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(1, 1),
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(1, 1);
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create table t2 (oref int, a int);
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insert into t2 values
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(1, NULL),
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(2, NULL);
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select a, oref,
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a in (select count(*) from t1 group by grp having grp=t2.oref) Z from t2;
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a oref Z
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NULL 1 NULL
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NULL 2 0
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This must show a trig_cond:
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explain extended
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select a, oref,
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a in (select count(*) from t1 group by grp having grp=t2.oref) Z from t2;
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id select_type table type possible_keys key key_len ref rows filtered Extra
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1 PRIMARY t2 ALL NULL NULL NULL NULL 2 100.00
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2 DEPENDENT SUBQUERY t1 ALL NULL NULL NULL NULL 2 100.00 Using temporary; Using filesort
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Warnings:
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Note 1276 Field or reference 't2.oref' of SELECT #2 was resolved in SELECT #1
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Note 1003 select `test`.`t2`.`a` AS `a`,`test`.`t2`.`oref` AS `oref`,<in_optimizer>(`test`.`t2`.`a`,<exists>(select count(0) AS `count(*)` from `test`.`t1` group by `test`.`t1`.`grp` having ((`test`.`t1`.`grp` = `test`.`t2`.`oref`) and trigcond((<cache>(`test`.`t2`.`a`) = <ref_null_helper>(count(0))))))) AS `Z` from `test`.`t2`
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drop table t1, t2;
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create table t1 (a int, b int, primary key (a));
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insert into t1 values (1,1), (3,1),(100,1);
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create table t2 (a int, b int);
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insert into t2 values (1,1),(2,1),(NULL,1),(NULL,0);
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select a,b, a in (select a from t1 where t1.b = t2.b union select a from
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t1 where t1.b = t2.b) Z from t2 ;
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a b Z
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1 1 1
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2 1 0
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NULL 1 NULL
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NULL 0 0
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select a,b, a in (select a from t1 where t1.b = t2.b) Z from t2 ;
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a b Z
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1 1 1
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2 1 0
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NULL 1 NULL
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NULL 0 0
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drop table t1, t2;
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create table t3 (a int);
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insert into t3 values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9);
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create table t2 (a int, b int, oref int);
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insert into t2 values (NULL,1, 100), (NULL,2, 100);
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create table t1 (a int, b int, c int, key(a,b));
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insert into t1 select 2*A, 2*A, 100 from t3;
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explain extended select a,b, oref, (a,b) in (select a,b from t1 where c=t2.oref) Z from t2;
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id select_type table type possible_keys key key_len ref rows filtered Extra
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1 PRIMARY t2 ALL NULL NULL NULL NULL 2 100.00
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2 DEPENDENT SUBQUERY t1 index_subquery a a 5 func 2 100.00 Using where; Full scan on NULL key
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Warnings:
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Note 1276 Field or reference 'test.t2.oref' of SELECT #2 was resolved in SELECT #1
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Note 1003 select `test`.`t2`.`a` AS `a`,`test`.`t2`.`b` AS `b`,`test`.`t2`.`oref` AS `oref`,<in_optimizer>((`test`.`t2`.`a`,`test`.`t2`.`b`),<exists>(<index_lookup>(<cache>(`test`.`t2`.`a`) in t1 on a checking NULL where ((`test`.`t1`.`c` = `test`.`t2`.`oref`) and trigcond(((<cache>(`test`.`t2`.`a`) = `test`.`t1`.`a`) or isnull(`test`.`t1`.`a`))) and trigcond(((<cache>(`test`.`t2`.`b`) = `test`.`t1`.`b`) or isnull(`test`.`t1`.`b`)))) having (trigcond(<is_not_null_test>(`test`.`t1`.`a`)) and trigcond(<is_not_null_test>(`test`.`t1`.`b`)))))) AS `Z` from `test`.`t2`
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select a,b, oref, (a,b) in (select a,b from t1 where c=t2.oref) Z from t2;
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a b oref Z
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NULL 1 100 0
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NULL 2 100 NULL
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create table t4 (x int);
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insert into t4 select A.a + 10*B.a from t1 A, t1 B;
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explain extended
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select a,b, oref,
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(a,b) in (select a,b from t1,t4 where c=t2.oref) Z
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from t2;
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id select_type table type possible_keys key key_len ref rows filtered Extra
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1 PRIMARY t2 ALL NULL NULL NULL NULL 2 100.00
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2 DEPENDENT SUBQUERY t1 ref_or_null a a 5 func 2 100.00 Using where; Full scan on NULL key
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2 DEPENDENT SUBQUERY t4 ALL NULL NULL NULL NULL 100 100.00 Using where; Using join buffer
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Warnings:
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Note 1276 Field or reference 'test.t2.oref' of SELECT #2 was resolved in SELECT #1
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Note 1003 select `test`.`t2`.`a` AS `a`,`test`.`t2`.`b` AS `b`,`test`.`t2`.`oref` AS `oref`,<in_optimizer>((`test`.`t2`.`a`,`test`.`t2`.`b`),<exists>(select `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b` from `test`.`t1` join `test`.`t4` where ((`test`.`t1`.`c` = `test`.`t2`.`oref`) and trigcond(((<cache>(`test`.`t2`.`a`) = `test`.`t1`.`a`) or isnull(`test`.`t1`.`a`))) and trigcond(((<cache>(`test`.`t2`.`b`) = `test`.`t1`.`b`) or isnull(`test`.`t1`.`b`)))) having (trigcond(<is_not_null_test>(`test`.`t1`.`a`)) and trigcond(<is_not_null_test>(`test`.`t1`.`b`))))) AS `Z` from `test`.`t2`
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select a,b, oref,
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(a,b) in (select a,b from t1,t4 where c=t2.oref) Z
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from t2;
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a b oref Z
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NULL 1 100 0
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NULL 2 100 NULL
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drop table t1,t2,t3,t4;
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create table t1 (oref char(4), grp int, ie1 int, ie2 int);
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insert into t1 (oref, grp, ie1, ie2) values
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('aa', 10, 2, 1),
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('aa', 10, 1, 1),
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('aa', 20, 2, 1),
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('bb', 10, 3, 1),
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('cc', 10, 4, 2),
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('cc', 20, 3, 2),
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('ee', 10, 2, 1),
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('ee', 10, 1, 2),
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('ff', 20, 2, 2),
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('ff', 20, 1, 2);
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create table t2 (oref char(4), a int, b int);
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insert into t2 values
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('ee', NULL, 1),
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('bb', 2, 1),
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('ff', 2, 2),
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('cc', 3, NULL),
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('bb', NULL, NULL),
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('aa', 1, 1),
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('dd', 1, NULL);
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alter table t1 add index idx(ie1,ie2);
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select oref, a, b, (a,b) in (select ie1,ie2 from t1 where oref=t2.oref) Z from t2 where a=3 and b is null ;
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oref a b Z
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cc 3 NULL NULL
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insert into t2 values ('new1', 10,10);
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insert into t1 values ('new1', 1234, 10, NULL);
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select oref, a, b, (a,b) in (select ie1,ie2 from t1 where oref=t2.oref) Z from t2 where a=10 and b=10;
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oref a b Z
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new1 10 10 NULL
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explain extended
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select oref, a, b, (a,b) in (select ie1,ie2 from t1 where oref=t2.oref) Z from t2 where a=10 and b=10;
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id select_type table type possible_keys key key_len ref rows filtered Extra
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1 PRIMARY t2 ALL NULL NULL NULL NULL 8 100.00 Using where
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2 DEPENDENT SUBQUERY t1 index_subquery idx idx 5 func 4 100.00 Using where; Full scan on NULL key
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Warnings:
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Note 1276 Field or reference 'test.t2.oref' of SELECT #2 was resolved in SELECT #1
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Note 1003 select `test`.`t2`.`oref` AS `oref`,`test`.`t2`.`a` AS `a`,`test`.`t2`.`b` AS `b`,<in_optimizer>((`test`.`t2`.`a`,`test`.`t2`.`b`),<exists>(<index_lookup>(<cache>(`test`.`t2`.`a`) in t1 on idx checking NULL where ((`test`.`t1`.`oref` = `test`.`t2`.`oref`) and trigcond(((<cache>(`test`.`t2`.`a`) = `test`.`t1`.`ie1`) or isnull(`test`.`t1`.`ie1`))) and trigcond(((<cache>(`test`.`t2`.`b`) = `test`.`t1`.`ie2`) or isnull(`test`.`t1`.`ie2`)))) having (trigcond(<is_not_null_test>(`test`.`t1`.`ie1`)) and trigcond(<is_not_null_test>(`test`.`t1`.`ie2`)))))) AS `Z` from `test`.`t2` where ((`test`.`t2`.`b` = 10) and (`test`.`t2`.`a` = 10))
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drop table t1, t2;
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create table t1 (oref char(4), grp int, ie int);
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insert into t1 (oref, grp, ie) values
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('aa', 10, 2),
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('aa', 10, 1),
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('aa', 20, NULL),
|
|
('bb', 10, 3),
|
|
('cc', 10, 4),
|
|
('cc', 20, NULL),
|
|
('ee', 10, NULL),
|
|
('ee', 10, NULL),
|
|
('ff', 20, 2),
|
|
('ff', 20, 1);
|
|
create table t2 (oref char(4), a int);
|
|
insert into t2 values
|
|
('ee', NULL),
|
|
('bb', 2),
|
|
('ff', 2),
|
|
('cc', 3),
|
|
('aa', 1),
|
|
('dd', NULL),
|
|
('bb', NULL);
|
|
select oref, a, a in (select ie from t1 where oref=t2.oref) Z from t2;
|
|
oref a Z
|
|
ee NULL NULL
|
|
bb 2 0
|
|
ff 2 1
|
|
cc 3 NULL
|
|
aa 1 1
|
|
dd NULL 0
|
|
bb NULL NULL
|
|
select oref, a from t2 where a in (select ie from t1 where oref=t2.oref);
|
|
oref a
|
|
ff 2
|
|
aa 1
|
|
select oref, a from t2 where a not in (select ie from t1 where oref=t2.oref);
|
|
oref a
|
|
bb 2
|
|
dd NULL
|
|
select oref, a, a in (select min(ie) from t1 where oref=t2.oref group by grp) Z from t2;
|
|
oref a Z
|
|
ee NULL NULL
|
|
bb 2 0
|
|
ff 2 0
|
|
cc 3 NULL
|
|
aa 1 1
|
|
dd NULL 0
|
|
bb NULL NULL
|
|
select oref, a from t2 where
|
|
a in (select min(ie) from t1 where oref=t2.oref group by grp);
|
|
oref a
|
|
aa 1
|
|
select oref, a from t2 where
|
|
a not in (select min(ie) from t1 where oref=t2.oref group by grp);
|
|
oref a
|
|
bb 2
|
|
ff 2
|
|
dd NULL
|
|
update t1 set ie=3 where oref='ff' and ie=1;
|
|
select oref, a, a in (select min(ie) from t1 where oref=t2.oref group by
|
|
grp) Z from t2;
|
|
oref a Z
|
|
ee NULL NULL
|
|
bb 2 0
|
|
ff 2 1
|
|
cc 3 NULL
|
|
aa 1 1
|
|
dd NULL 0
|
|
bb NULL NULL
|
|
select oref, a from t2 where a in (select min(ie) from t1 where
|
|
oref=t2.oref group by grp);
|
|
oref a
|
|
ff 2
|
|
aa 1
|
|
select oref, a from t2 where a not in (select min(ie) from t1 where
|
|
oref=t2.oref group by grp);
|
|
oref a
|
|
bb 2
|
|
dd NULL
|
|
select oref, a, a in (select min(ie) from t1 where oref=t2.oref group by
|
|
grp having min(ie) > 1) Z from t2;
|
|
oref a Z
|
|
ee NULL 0
|
|
bb 2 0
|
|
ff 2 1
|
|
cc 3 0
|
|
aa 1 0
|
|
dd NULL 0
|
|
bb NULL NULL
|
|
select oref, a from t2 where a in (select min(ie) from t1 where
|
|
oref=t2.oref group by grp having min(ie) > 1);
|
|
oref a
|
|
ff 2
|
|
select oref, a from t2 where a not in (select min(ie) from t1 where
|
|
oref=t2.oref group by grp having min(ie) > 1);
|
|
oref a
|
|
ee NULL
|
|
bb 2
|
|
cc 3
|
|
aa 1
|
|
dd NULL
|
|
alter table t1 add index idx(ie);
|
|
explain select oref, a, a in (select ie from t1 where oref=t2.oref) Z from t2;
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 PRIMARY t2 ALL NULL NULL NULL NULL 7
|
|
2 DEPENDENT SUBQUERY t1 index_subquery idx idx 5 func 4 Using where; Full scan on NULL key
|
|
select oref, a, a in (select ie from t1 where oref=t2.oref) Z from t2;
|
|
oref a Z
|
|
ee NULL NULL
|
|
bb 2 0
|
|
ff 2 1
|
|
cc 3 NULL
|
|
aa 1 1
|
|
dd NULL 0
|
|
bb NULL NULL
|
|
select oref, a from t2 where a in (select ie from t1 where oref=t2.oref);
|
|
oref a
|
|
ff 2
|
|
aa 1
|
|
select oref, a from t2 where a not in (select ie from t1 where oref=t2.oref);
|
|
oref a
|
|
bb 2
|
|
dd NULL
|
|
alter table t1 drop index idx;
|
|
alter table t1 add index idx(oref,ie);
|
|
explain select oref, a, a in (select ie from t1 where oref=t2.oref) Z from t2;
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 PRIMARY t2 ALL NULL NULL NULL NULL 7
|
|
2 DEPENDENT SUBQUERY t1 ref_or_null idx idx 10 test.t2.oref,func 4 Using where; Using index; Full scan on NULL key
|
|
select oref, a, a in (select ie from t1 where oref=t2.oref) Z from t2;
|
|
oref a Z
|
|
ee NULL NULL
|
|
bb 2 0
|
|
ff 2 1
|
|
cc 3 NULL
|
|
aa 1 1
|
|
dd NULL 0
|
|
bb NULL NULL
|
|
select oref, a from t2 where a in (select ie from t1 where oref=t2.oref);
|
|
oref a
|
|
ff 2
|
|
aa 1
|
|
select oref, a from t2 where a not in (select ie from t1 where oref=t2.oref);
|
|
oref a
|
|
bb 2
|
|
dd NULL
|
|
explain
|
|
select oref, a,
|
|
a in (select min(ie) from t1 where oref=t2.oref
|
|
group by grp having min(ie) > 1) Z
|
|
from t2;
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 PRIMARY t2 ALL NULL NULL NULL NULL 7
|
|
2 DEPENDENT SUBQUERY t1 ref idx idx 5 test.t2.oref 2 Using where; Using temporary; Using filesort
|
|
select oref, a,
|
|
a in (select min(ie) from t1 where oref=t2.oref
|
|
group by grp having min(ie) > 1) Z
|
|
from t2;
|
|
oref a Z
|
|
ee NULL 0
|
|
bb 2 0
|
|
ff 2 1
|
|
cc 3 0
|
|
aa 1 0
|
|
dd NULL 0
|
|
bb NULL NULL
|
|
select oref, a from t2 where a in (select min(ie) from t1 where oref=t2.oref
|
|
group by grp having min(ie) > 1);
|
|
oref a
|
|
ff 2
|
|
select oref, a from t2 where a not in (select min(ie) from t1 where oref=t2.oref
|
|
group by grp having min(ie) > 1);
|
|
oref a
|
|
ee NULL
|
|
bb 2
|
|
cc 3
|
|
aa 1
|
|
dd NULL
|
|
drop table t1,t2;
|
|
create table t1 (oref char(4), grp int, ie1 int, ie2 int);
|
|
insert into t1 (oref, grp, ie1, ie2) values
|
|
('aa', 10, 2, 1),
|
|
('aa', 10, 1, 1),
|
|
('aa', 20, 2, 1),
|
|
('bb', 10, 3, 1),
|
|
('cc', 10, 4, 2),
|
|
('cc', 20, 3, 2),
|
|
('ee', 10, 2, 1),
|
|
('ee', 10, 1, 2),
|
|
('ff', 20, 2, 2),
|
|
('ff', 20, 1, 2);
|
|
create table t2 (oref char(4), a int, b int);
|
|
insert into t2 values
|
|
('ee', NULL, 1),
|
|
('bb', 2, 1),
|
|
('ff', 2, 2),
|
|
('cc', 3, NULL),
|
|
('bb', NULL, NULL),
|
|
('aa', 1, 1),
|
|
('dd', 1, NULL);
|
|
select oref, a, b, (a,b) in (select ie1,ie2 from t1 where oref=t2.oref) Z from t2;
|
|
oref a b Z
|
|
ee NULL 1 NULL
|
|
bb 2 1 0
|
|
ff 2 2 1
|
|
cc 3 NULL NULL
|
|
bb NULL NULL NULL
|
|
aa 1 1 1
|
|
dd 1 NULL 0
|
|
select oref, a, b from t2 where (a,b) in (select ie1,ie2 from t1 where oref=t2.oref);
|
|
oref a b
|
|
ff 2 2
|
|
aa 1 1
|
|
select oref, a, b from t2 where (a,b) not in (select ie1,ie2 from t1 where oref=t2.oref);
|
|
oref a b
|
|
bb 2 1
|
|
dd 1 NULL
|
|
select oref, a, b,
|
|
(a,b) in (select min(ie1),max(ie2) from t1
|
|
where oref=t2.oref group by grp) Z
|
|
from t2;
|
|
oref a b Z
|
|
ee NULL 1 0
|
|
bb 2 1 0
|
|
ff 2 2 0
|
|
cc 3 NULL NULL
|
|
bb NULL NULL NULL
|
|
aa 1 1 1
|
|
dd 1 NULL 0
|
|
select oref, a, b from t2 where
|
|
(a,b) in (select min(ie1), max(ie2) from t1 where oref=t2.oref group by grp);
|
|
oref a b
|
|
aa 1 1
|
|
select oref, a, b from t2 where
|
|
(a,b) not in (select min(ie1), max(ie2) from t1 where oref=t2.oref group by grp);
|
|
oref a b
|
|
ee NULL 1
|
|
bb 2 1
|
|
ff 2 2
|
|
dd 1 NULL
|
|
alter table t1 add index idx(ie1,ie2);
|
|
explain select oref, a, b, (a,b) in (select ie1,ie2 from t1 where oref=t2.oref) Z from t2;
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 PRIMARY t2 ALL NULL NULL NULL NULL 7
|
|
2 DEPENDENT SUBQUERY t1 index_subquery idx idx 5 func 4 Using where; Full scan on NULL key
|
|
select oref, a, b, (a,b) in (select ie1,ie2 from t1 where oref=t2.oref) Z from t2;
|
|
oref a b Z
|
|
ee NULL 1 NULL
|
|
bb 2 1 0
|
|
ff 2 2 1
|
|
cc 3 NULL NULL
|
|
bb NULL NULL NULL
|
|
aa 1 1 1
|
|
dd 1 NULL 0
|
|
select oref, a, b from t2 where (a,b) in (select ie1,ie2 from t1 where oref=t2.oref);
|
|
oref a b
|
|
ff 2 2
|
|
aa 1 1
|
|
select oref, a, b from t2 where (a,b) not in (select ie1,ie2 from t1 where oref=t2.oref);
|
|
oref a b
|
|
bb 2 1
|
|
dd 1 NULL
|
|
explain extended
|
|
select oref, a, b, (a,b) in (select ie1,ie2 from t1 where oref=t2.oref) Z from t2;
|
|
id select_type table type possible_keys key key_len ref rows filtered Extra
|
|
1 PRIMARY t2 ALL NULL NULL NULL NULL 7 100.00
|
|
2 DEPENDENT SUBQUERY t1 index_subquery idx idx 5 func 4 100.00 Using where; Full scan on NULL key
|
|
Warnings:
|
|
Note 1276 Field or reference 'test.t2.oref' of SELECT #2 was resolved in SELECT #1
|
|
Note 1003 select `test`.`t2`.`oref` AS `oref`,`test`.`t2`.`a` AS `a`,`test`.`t2`.`b` AS `b`,<in_optimizer>((`test`.`t2`.`a`,`test`.`t2`.`b`),<exists>(<index_lookup>(<cache>(`test`.`t2`.`a`) in t1 on idx checking NULL where ((`test`.`t1`.`oref` = `test`.`t2`.`oref`) and trigcond(((<cache>(`test`.`t2`.`a`) = `test`.`t1`.`ie1`) or isnull(`test`.`t1`.`ie1`))) and trigcond(((<cache>(`test`.`t2`.`b`) = `test`.`t1`.`ie2`) or isnull(`test`.`t1`.`ie2`)))) having (trigcond(<is_not_null_test>(`test`.`t1`.`ie1`)) and trigcond(<is_not_null_test>(`test`.`t1`.`ie2`)))))) AS `Z` from `test`.`t2`
|
|
drop table t1,t2;
|
|
create table t1 (oref char(4), grp int, ie int primary key);
|
|
insert into t1 (oref, grp, ie) values
|
|
('aa', 10, 2),
|
|
('aa', 10, 1),
|
|
('bb', 10, 3),
|
|
('cc', 10, 4),
|
|
('cc', 20, 5),
|
|
('cc', 10, 6);
|
|
create table t2 (oref char(4), a int);
|
|
insert into t2 values
|
|
('ee', NULL),
|
|
('bb', 2),
|
|
('cc', 5),
|
|
('cc', 2),
|
|
('cc', NULL),
|
|
('aa', 1),
|
|
('bb', NULL);
|
|
explain select oref, a, a in (select ie from t1 where oref=t2.oref) Z from t2;
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 PRIMARY t2 ALL NULL NULL NULL NULL 7
|
|
2 DEPENDENT SUBQUERY t1 unique_subquery PRIMARY PRIMARY 4 func 1 Using where; Full scan on NULL key
|
|
select oref, a, a in (select ie from t1 where oref=t2.oref) Z from t2;
|
|
oref a Z
|
|
ee NULL 0
|
|
bb 2 0
|
|
cc 5 1
|
|
cc 2 0
|
|
cc NULL NULL
|
|
aa 1 1
|
|
bb NULL NULL
|
|
select oref, a from t2 where a in (select ie from t1 where oref=t2.oref);
|
|
oref a
|
|
cc 5
|
|
aa 1
|
|
select oref, a from t2 where a not in (select ie from t1 where oref=t2.oref);
|
|
oref a
|
|
ee NULL
|
|
bb 2
|
|
cc 2
|
|
explain
|
|
select oref, a, a in (select min(ie) from t1 where oref=t2.oref group by grp) Z from t2;
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 PRIMARY t2 ALL NULL NULL NULL NULL 7
|
|
2 DEPENDENT SUBQUERY t1 ALL NULL NULL NULL NULL 6 Using where; Using temporary; Using filesort
|
|
select oref, a, a in (select min(ie) from t1 where oref=t2.oref group by grp) Z from t2;
|
|
oref a Z
|
|
ee NULL 0
|
|
bb 2 0
|
|
cc 5 1
|
|
cc 2 0
|
|
cc NULL NULL
|
|
aa 1 1
|
|
bb NULL NULL
|
|
drop table t1,t2;
|
|
create table t1 (a int, b int);
|
|
insert into t1 values (0,0), (2,2), (3,3);
|
|
create table t2 (a int, b int);
|
|
insert into t2 values (1,1), (3,3);
|
|
select a, b, (a,b) in (select a, min(b) from t2 group by a) Z from t1;
|
|
a b Z
|
|
0 0 0
|
|
2 2 0
|
|
3 3 1
|
|
insert into t2 values (NULL,4);
|
|
select a, b, (a,b) in (select a, min(b) from t2 group by a) Z from t1;
|
|
a b Z
|
|
0 0 0
|
|
2 2 0
|
|
3 3 1
|
|
drop table t1,t2;
|
|
CREATE TABLE t1 (a int, b INT, c CHAR(10) NOT NULL, PRIMARY KEY (a, b));
|
|
INSERT INTO t1 VALUES (1,1,'a'), (1,2,'b'), (1,3,'c'), (1,4,'d'), (1,5,'e'),
|
|
(2,1,'f'), (2,2,'g'), (2,3,'h'), (3,4,'i'),(3,3,'j'), (3,2,'k'), (3,1,'l'),
|
|
(1,9,'m');
|
|
CREATE TABLE t2 (a int, b INT, c CHAR(10) NOT NULL, PRIMARY KEY (a, b));
|
|
INSERT INTO t2 SELECT * FROM t1;
|
|
SELECT a, MAX(b), (SELECT t.c FROM t1 AS t WHERE t1.a=t.a AND t.b=MAX(t1.b))
|
|
as test FROM t1 GROUP BY a;
|
|
a MAX(b) test
|
|
1 9 m
|
|
2 3 h
|
|
3 4 i
|
|
SELECT * FROM t1 GROUP by t1.a
|
|
HAVING (MAX(t1.b) > (SELECT MAX(t2.b) FROM t2 WHERE t2.c < t1.c
|
|
HAVING MAX(t2.b+t1.a) < 10));
|
|
a b c
|
|
SELECT a,b,c FROM t1 WHERE b in (9,3,4) ORDER BY b,c;
|
|
a b c
|
|
1 3 c
|
|
2 3 h
|
|
3 3 j
|
|
1 4 d
|
|
3 4 i
|
|
1 9 m
|
|
SELECT a, MAX(b),
|
|
(SELECT COUNT(DISTINCT t.c) FROM t1 AS t WHERE t1.a=t.a AND t.b=MAX(t1.b)
|
|
LIMIT 1)
|
|
as cnt,
|
|
(SELECT t.b FROM t1 AS t WHERE t1.a=t.a AND t.b=MAX(t1.b) LIMIT 1)
|
|
as t_b,
|
|
(SELECT t.c FROM t1 AS t WHERE t1.a=t.a AND t.b=MAX(t1.b) LIMIT 1)
|
|
as t_b,
|
|
(SELECT t.c FROM t1 AS t WHERE t1.a=t.a AND t.b=MAX(t1.b) ORDER BY t.c LIMIT 1)
|
|
as t_b
|
|
FROM t1 GROUP BY a;
|
|
a MAX(b) cnt t_b t_b t_b
|
|
1 9 1 9 m m
|
|
2 3 1 3 h h
|
|
3 4 1 4 i i
|
|
SELECT a, MAX(b),
|
|
(SELECT t.c FROM t1 AS t WHERE t1.a=t.a AND t.b=MAX(t1.b) LIMIT 1) as test
|
|
FROM t1 GROUP BY a;
|
|
a MAX(b) test
|
|
1 9 m
|
|
2 3 h
|
|
3 4 i
|
|
DROP TABLE t1, t2;
|
|
CREATE TABLE t1 (a int);
|
|
CREATE TABLE t2 (b int, PRIMARY KEY(b));
|
|
INSERT INTO t1 VALUES (1), (NULL), (4);
|
|
INSERT INTO t2 VALUES (3), (1),(2), (5), (4), (7), (6);
|
|
EXPLAIN EXTENDED
|
|
SELECT a FROM t1, t2 WHERE a=b AND (b NOT IN (SELECT a FROM t1));
|
|
id select_type table type possible_keys key key_len ref rows filtered Extra
|
|
1 PRIMARY t1 ALL NULL NULL NULL NULL 3 100.00 Using where
|
|
1 PRIMARY t2 eq_ref PRIMARY PRIMARY 4 test.t1.a 1 100.00 Using index
|
|
2 DEPENDENT SUBQUERY t1 ALL NULL NULL NULL NULL 3 100.00 Using where
|
|
Warnings:
|
|
Note 1003 select `test`.`t1`.`a` AS `a` from `test`.`t1` join `test`.`t2` where ((`test`.`t2`.`b` = `test`.`t1`.`a`) and (not(<in_optimizer>(`test`.`t1`.`a`,<exists>(select 1 AS `Not_used` from `test`.`t1` where ((<cache>(`test`.`t2`.`b`) = `test`.`t1`.`a`) or isnull(`test`.`t1`.`a`)) having <is_not_null_test>(`test`.`t1`.`a`))))))
|
|
SELECT a FROM t1, t2 WHERE a=b AND (b NOT IN (SELECT a FROM t1));
|
|
a
|
|
SELECT a FROM t1, t2 WHERE a=b AND (b NOT IN (SELECT a FROM t1 WHERE a > 4));
|
|
a
|
|
1
|
|
4
|
|
DROP TABLE t1,t2;
|
|
CREATE TABLE t1 (id int);
|
|
CREATE TABLE t2 (id int PRIMARY KEY);
|
|
CREATE TABLE t3 (id int PRIMARY KEY, name varchar(10));
|
|
INSERT INTO t1 VALUES (2), (NULL), (3), (1);
|
|
INSERT INTO t2 VALUES (234), (345), (457);
|
|
INSERT INTO t3 VALUES (222,'bbb'), (333,'ccc'), (111,'aaa');
|
|
EXPLAIN
|
|
SELECT * FROM t1
|
|
WHERE t1.id NOT IN (SELECT t2.id FROM t2,t3
|
|
WHERE t3.name='xxx' AND t2.id=t3.id);
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 PRIMARY t1 ALL NULL NULL NULL NULL 4 Using where
|
|
2 DEPENDENT SUBQUERY t2 eq_ref PRIMARY PRIMARY 4 func 1 Using where; Using index; Full scan on NULL key
|
|
2 DEPENDENT SUBQUERY t3 eq_ref PRIMARY PRIMARY 4 func 1 Using where; Full scan on NULL key
|
|
SELECT * FROM t1
|
|
WHERE t1.id NOT IN (SELECT t2.id FROM t2,t3
|
|
WHERE t3.name='xxx' AND t2.id=t3.id);
|
|
id
|
|
2
|
|
NULL
|
|
3
|
|
1
|
|
SELECT (t1.id IN (SELECT t2.id FROM t2,t3
|
|
WHERE t3.name='xxx' AND t2.id=t3.id)) AS x
|
|
FROM t1;
|
|
x
|
|
0
|
|
0
|
|
0
|
|
0
|
|
DROP TABLE t1,t2,t3;
|
|
CREATE TABLE t1 (a INT NOT NULL);
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INSERT INTO t1 VALUES (1),(-1), (65),(66);
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CREATE TABLE t2 (a INT UNSIGNED NOT NULL PRIMARY KEY);
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INSERT INTO t2 VALUES (65),(66);
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|
SELECT a FROM t1 WHERE a NOT IN (65,66);
|
|
a
|
|
1
|
|
-1
|
|
SELECT a FROM t1 WHERE a NOT IN (SELECT a FROM t2);
|
|
a
|
|
1
|
|
-1
|
|
EXPLAIN SELECT a FROM t1 WHERE a NOT IN (SELECT a FROM t2);
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|
id select_type table type possible_keys key key_len ref rows Extra
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1 PRIMARY t1 ALL NULL NULL NULL NULL 4 Using where
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2 DEPENDENT SUBQUERY t2 unique_subquery PRIMARY PRIMARY 4 func 1 Using index
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DROP TABLE t1;
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End of 5.0 tests
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