mirror of
https://github.com/MariaDB/server.git
synced 2025-12-06 05:42:06 +03:00
1c6fc3f6b9
Part 2 of: - Pass more tests - select with subselects is now shown with type=PRIMARY where it used to be (incorrectly) 'SIMPLE'
87 lines
2.6 KiB
Plaintext
87 lines
2.6 KiB
Plaintext
#
|
|
# MariaDB tests for EXPLAIN UPDATE/DELETE.
|
|
#
|
|
--disable_warnings
|
|
drop table if exists t0, t1;
|
|
--enable_warnings
|
|
|
|
create table t0 (a int) engine=myisam;
|
|
insert into t0 values (1),(2),(3),(4),(5),(6),(7),(8);
|
|
|
|
--echo #
|
|
--echo # Tests for single-table DELETE
|
|
--echo #
|
|
|
|
explain select * from t0 where a=3;
|
|
explain delete from t0 where a=3;
|
|
|
|
--echo # DELETE without WHERE is a special case:
|
|
explain delete from t0;
|
|
|
|
create table t1 (a int, b int, filler char(100), key(a), key(b));
|
|
insert into t1
|
|
select A.a+10*B.a + 10*C.a, A.a+10*B.a + 10*C.a, 'filler'
|
|
from t0 A, t0 B, t0 C;
|
|
|
|
--echo # This should use an index, possible_keys=NULL because there is no WHERE
|
|
explain delete from t1 order by a limit 2;
|
|
|
|
--echo # This should use range, possible_keys={a,b}
|
|
explain delete from t1 where a<20 and b < 10;
|
|
|
|
--echo # This should use ALL + filesort
|
|
explain delete from t1 order by a+1 limit 2;
|
|
|
|
--echo # This should use range + using filesort
|
|
explain delete from t1 where a<20 order by b limit 2;
|
|
|
|
--echo # Try some subqueries:
|
|
explain delete from t1 where a < (select max(a) from t0);
|
|
explain delete from t1 where a < (select max(a) from t0 where a < t1.b);
|
|
|
|
--echo #
|
|
--echo # Tests for multi-table DELETE
|
|
--echo #
|
|
explain delete t1 from t0, t1 where t0.a = t1.a;
|
|
drop table t0, t1;
|
|
|
|
--echo # ###################################################################
|
|
--echo # ## EXPLAIN UPDATE tests
|
|
--echo # ###################################################################
|
|
create table t0 (a int) engine=myisam;
|
|
insert into t0 values (1),(2),(3),(4),(5),(6),(7),(8);
|
|
|
|
explain update t0 set a=3 where a=4;
|
|
|
|
create table t1 (a int, b int, filler char(100), key(a), key(b));
|
|
insert into t1
|
|
select A.a+10*B.a + 10*C.a, A.a+10*B.a + 10*C.a, 'filler'
|
|
from t0 A, t0 B, t0 C;
|
|
|
|
explain update t1 set a=a+1 where 3>4;
|
|
explain update t1 set a=a+1 where a=3 and a=4;
|
|
|
|
--echo # This should use an index, possible_keys=NULL because there is no WHERE
|
|
explain update t1 set a=a+1 order by a limit 2;
|
|
|
|
--echo # This should use range, possible_keys={a,b}
|
|
explain update t1 set filler='fooo' where a<20 and b < 10;
|
|
|
|
--echo # This should use ALL + filesort
|
|
explain update t1 set filler='fooo' order by a+1 limit 2;
|
|
|
|
--echo # This should use range + using filesort
|
|
explain update t1 set filler='fooo' where a<20 order by b limit 2;
|
|
|
|
--echo # Try some subqueries:
|
|
explain update t1 set filler='fooo' where a < (select max(a) from t0);
|
|
explain update t1 set filler='fooo' where a < (select max(a) from t0 where a < t1.b);
|
|
|
|
--echo #
|
|
--echo # Tests for multi-table UPDATE
|
|
--echo #
|
|
explain update t0, t1 set t1.a=t1.a+1 where t0.a = t1.a;
|
|
|
|
|
|
drop table t0, t1;
|