diff options
Diffstat (limited to 'mysql-test/r/subselect3.result')
| -rw-r--r-- | mysql-test/r/subselect3.result | 153 |
1 files changed, 153 insertions, 0 deletions
diff --git a/mysql-test/r/subselect3.result b/mysql-test/r/subselect3.result new file mode 100644 index 00000000000..10cc2729f3e --- /dev/null +++ b/mysql-test/r/subselect3.result @@ -0,0 +1,153 @@ +drop table if exists t0, t1, t2, t3, t4; +create table t1 (oref int, grp int, ie int) ; +insert into t1 (oref, grp, ie) values +(1, 1, 1), +(1, 1, 1), +(1, 2, NULL), +(2, 1, 3), +(3, 1, 4), +(3, 2, NULL); +create table t2 (oref int, a int); +insert into t2 values +(1, 1), +(2, 2), +(3, 3), +(4, NULL), +(2, NULL); +select a, oref, a in (select max(ie) +from t1 where oref=t2.oref group by grp) from t2; +a oref a in (select max(ie) +from t1 where oref=t2.oref group by grp) +1 1 1 +2 2 0 +3 3 NULL +NULL 4 0 +NULL 2 NULL +explain extended +select a, oref, a in (select max(ie) +from t1 where oref=t2.oref group by grp) from t2; +id select_type table type possible_keys key key_len ref rows filtered Extra +1 PRIMARY t2 ALL NULL NULL NULL NULL 5 100.00 +2 DEPENDENT SUBQUERY t1 ALL NULL NULL NULL NULL 6 100.00 Using where; Using temporary; Using filesort +Warnings: +Note 1276 Field or reference 't2.oref' of SELECT #2 was resolved in SELECT #1 +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 `a in (select max(ie) +from t1 where oref=t2.oref group by grp)` from `test`.`t2` +explain extended +select a, oref from t2 +where a in (select max(ie) from t1 where oref=t2.oref group by grp); +id select_type table type possible_keys key key_len ref rows filtered Extra +1 PRIMARY t2 ALL NULL NULL NULL NULL 5 100.00 Using where +2 DEPENDENT SUBQUERY t1 ALL NULL NULL NULL NULL 6 100.00 Using where; Using temporary; Using filesort +Warnings: +Note 1276 Field or reference 't2.oref' of SELECT #2 was resolved in SELECT #1 +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`))))) +create table t3 (a int); +insert into t3 values (NULL), (NULL); +flush status; +select a in (select max(ie) from t1 where oref=4 group by grp) from t3; +a in (select max(ie) from t1 where oref=4 group by grp) +0 +0 +show status like 'Handler_read_rnd_next'; +Variable_name Value +Handler_read_rnd_next 11 +select ' ^ This must show 11' Z; +Z + ^ This must show 11 +explain extended select a in (select max(ie) from t1 where oref=4 group by grp) from t3; +id select_type table type possible_keys key key_len ref rows filtered Extra +1 PRIMARY t3 ALL NULL NULL NULL NULL 2 100.00 +2 DEPENDENT SUBQUERY t1 ALL NULL NULL NULL NULL 6 100.00 Using where; Using temporary; Using filesort +Warnings: +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` +drop table t1, t2, t3; +create table t1 (a int, oref int, key(a)); +insert into t1 values +(1, 1), +(1, NULL), +(2, 3), +(2, NULL), +(3, NULL); +create table t2 (a int, oref int); +insert into t2 values (1, 1), (2,2), (NULL, 3), (NULL, 4); +select oref, a, a in (select a from t1 where oref=t2.oref) Z from t2; +oref a Z +1 1 1 +2 2 0 +3 NULL NULL +4 NULL 0 +explain extended +select oref, a, a in (select a 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 4 100.00 +2 DEPENDENT SUBQUERY t1 index_subquery a a 5 func 2 100.00 Using index; Using where +Warnings: +Note 1276 Field or reference 't2.oref' of SELECT #2 was resolved in SELECT #1 +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`)))) AS `Z` from `test`.`t2` +flush status; +select oref, a from t2 where a in (select a from t1 where oref=t2.oref); +oref a +1 1 +show status like '%Handler_read_rnd_next'; +Variable_name Value +Handler_read_rnd_next 5 +delete from t2; +insert into t2 values (NULL, 0),(NULL, 0), (NULL, 0), (NULL, 0); +flush status; +select oref, a, a in (select a from t1 where oref=t2.oref) Z from t2; +oref a Z +0 NULL 0 +0 NULL 0 +0 NULL 0 +0 NULL 0 +show status like '%Handler_read%'; +Variable_name Value +Handler_read_first 0 +Handler_read_key 0 +Handler_read_next 0 +Handler_read_prev 0 +Handler_read_rnd 0 +Handler_read_rnd_next 29 +select 'No key lookups, seq reads: 29= 5 reads from t2 + 4 * 6 reads from t1.' Z; +Z +No key lookups, seq reads: 29= 5 reads from t2 + 4 * 6 reads from t1. +drop table t1, t2; +create table t1 (a int, b int, primary key (a)); +insert into t1 values (1,1), (3,1),(100,1); +create table t2 (a int, b int); +insert into t2 values (1,1),(2,1),(NULL,1),(NULL,0); +select a,b, a in (select a from t1 where t1.b = t2.b) Z from t2 ; +a b Z +1 1 1 +2 1 0 +NULL 1 NULL +NULL 0 0 +drop table t1, t2; +create table t1 (a int, b int, key(a)); +insert into t1 values +(0,0),(1,1),(2,2),(3,3),(4,4),(5,5),(6,6),(7,7),(8,8),(9,9); +create table t2 like t1; +insert into t2 select * from t1; +update t2 set b=1; +create table t3 (a int, oref int); +insert into t3 values (1, 1), (NULL,1), (NULL,0); +select a, oref, +t3.a in (select t1.a from t1, t2 where t1.b=t2.a and t2.b=t3.oref) Z +from t3; +a oref Z +1 1 1 +NULL 1 NULL +NULL 0 0 +explain extended +select a, oref, +t3.a in (select t1.a from t1, t2 where t1.b=t2.a and t2.b=t3.oref) Z +from t3; +id select_type table type possible_keys key key_len ref rows filtered Extra +1 PRIMARY t3 ALL NULL NULL NULL NULL 3 100.00 +2 DEPENDENT SUBQUERY t1 ref_or_null a a 5 func 4 100.00 Using where +2 DEPENDENT SUBQUERY t2 ref a a 5 test.t1.b 1 100.00 Using where +Warnings: +Note 1276 Field or reference 't3.oref' of SELECT #2 was resolved in SELECT #1 +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` +drop table t1, t2, t3; |