mariadb/mysql-test/main/delete_use_source_engines.result

set @save_default_engine=@@default_storage_engine;
#######################################
#                                     #
#            Engine InnoDB            #
#                                     #
#######################################
set global innodb_stats_persistent=1;
set default_storage_engine=InnoDB;
create table t1 (c1 integer, c2 integer, c3 integer);
insert into t1(c1,c2,c3)
values (1,1,1),(1,2,2),(1,3,3),
(2,1,4),(2,2,5),(2,3,6),
(2,4,7),(2,5,8);
insert into t1 select c1+10,c2,c3+10 from t1;
insert into t1 select c1+20,c2+1,c3+20 from t1;
analyze table t1 persistent for all;
Table	Op	Msg_type	Msg_text
test.t1	analyze	status	Engine-independent statistics collected
test.t1	analyze	status	OK
create view v1 as select * from t1 where c2=2;
#######################################
#        Test without any index       #
#######################################
#
# Delete with value from subquery on the same table
#
analyze table t1 persistent for all;
Table	Op	Msg_type	Msg_text
test.t1	analyze	status	Engine-independent statistics collected
test.t1	analyze	status	OK
create table tmp as select * from t1 where c1=(select a.c3 from t1 a where a.c3 = t1.c3);
explain select * from t1 where c1=(select a.c3 from t1 a where a.c3 = t1.c3);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	32	Using where
2	DEPENDENT SUBQUERY	a	ALL	NULL	NULL	NULL	NULL	32	Using where
explain delete from t1 where c1=(select a.c3 from t1 a where a.c3 = t1.c3);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	32	Using where
2	DEPENDENT SUBQUERY	a	ALL	NULL	NULL	NULL	NULL	32	Using where
delete from t1 where c1=(select a.c3 from t1 a where a.c3 = t1.c3);
affected rows: 4
select * from t1;
c1	c2	c3
1	2	2
1	3	3
11	2	12
11	3	13
12	1	14
12	2	15
12	3	16
12	4	17
12	5	18
2	1	4
2	2	5
2	3	6
2	4	7
2	5	8
21	3	22
21	4	23
22	2	24
22	3	25
22	4	26
22	5	27
22	6	28
31	3	32
31	4	33
32	2	34
32	3	35
32	4	36
32	5	37
32	6	38
insert into t1(c1,c2,c3) select c1,c2,c3 from tmp;
drop table tmp;
#
# Delete with EXISTS subquery over the updated table
# in WHERE + possibly sargable condition
#
analyze table t1 persistent for all;
Table	Op	Msg_type	Msg_text
test.t1	analyze	status	Engine-independent statistics collected
test.t1	analyze	status	OK
create table tmp as select * from t1 where c1 = 1 and exists (select 'X' from t1 a where a.c1 = t1.c2);
explain select * from t1 where c1 = 1 and exists (select 'X' from t1 a where a.c1 = t1.c2);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	32	Using where
1	PRIMARY	a	ALL	NULL	NULL	NULL	NULL	32	Using where; FirstMatch(t1); Using join buffer (flat, BNL join)
explain delete from t1 where c1 = 1 and exists (select 'X' from t1 a where a.c1 = t1.c2);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	32	Using where
1	PRIMARY	a	ALL	NULL	NULL	NULL	NULL	32	Using where; FirstMatch(t1)
analyze delete from t1 where c1 = 1 and exists (select 'X' from t1 a where a.c1 = t1.c2);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	r_rows	filtered	r_filtered	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	32	32.00	9.38	9.38	Using where
1	PRIMARY	a	ALL	NULL	NULL	NULL	NULL	32	12.00	3.12	5.56	Using where; FirstMatch(t1)
select * from t1;
c1	c2	c3
1	3	3
11	1	11
11	2	12
11	3	13
12	1	14
12	2	15
12	3	16
12	4	17
12	5	18
2	1	4
2	2	5
2	3	6
2	4	7
2	5	8
21	2	21
21	3	22
21	4	23
22	2	24
22	3	25
22	4	26
22	5	27
22	6	28
31	2	31
31	3	32
31	4	33
32	2	34
32	3	35
32	4	36
32	5	37
32	6	38
insert into t1(c1,c2,c3) select c1,c2,c3 from tmp;
drop table tmp;
#
# Delete with IN predicand over the updated table in WHERE
#
create table tmp as select * from t1 where c3 in (select distinct a.c1 from t1 a where t1.c2=a.c2);
explain select * from t1 where c3 in (select distinct a.c1 from t1 a where t1.c2=a.c2);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	32	
1	PRIMARY	a	ALL	NULL	NULL	NULL	NULL	32	Using where; FirstMatch(t1); Using join buffer (flat, BNL join)
explain delete from t1 where c3 in (select distinct a.c1 from t1 a where t1.c2=a.c2);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	32	
1	PRIMARY	a	ALL	NULL	NULL	NULL	NULL	32	Using where; FirstMatch(t1)
delete from t1 where c3 in (select distinct a.c1 from t1 a where t1.c2=a.c2);
affected rows: 8
select * from t1;
c1	c2	c3
1	3	3
11	3	13
12	1	14
12	2	15
12	3	16
12	4	17
12	5	18
2	1	4
2	2	5
2	3	6
2	4	7
2	5	8
21	4	23
22	2	24
22	3	25
22	4	26
22	5	27
22	6	28
31	4	33
32	2	34
32	3	35
32	4	36
32	5	37
32	6	38
insert into t1(c1,c2,c3) select c1,c2,c3 from tmp;
drop table tmp;
#
# Delete with a limit - can be deleted
#
create table tmp as select * from t1 where c1 in (select a.c2 from t1 a where a.c2 = t1.c3) limit 1;
explain select * from t1 where c1 in (select a.c2 from t1 a where a.c2 = t1.c3) limit 1;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	32	Using where
1	PRIMARY	a	ALL	NULL	NULL	NULL	NULL	32	Using where; FirstMatch(t1); Using join buffer (flat, BNL join)
explain delete from t1 where c1 in (select a.c2 from t1 a where a.c2 = t1.c3) limit 1;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	32	Using where
1	PRIMARY	a	ALL	NULL	NULL	NULL	NULL	32	Using where; FirstMatch(t1)
analyze delete from t1 where c1 in (select a.c2 from t1 a where a.c2 = t1.c3) limit 1;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	r_rows	filtered	r_filtered	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	32	32.00	100.00	12.50	Using where
1	PRIMARY	a	ALL	NULL	NULL	NULL	NULL	32	24.50	3.12	1.02	Using where; FirstMatch(t1)
select * from t1;
c1	c2	c3
1	2	2
1	3	3
11	1	11
11	2	12
11	3	13
12	1	14
12	2	15
12	3	16
12	4	17
12	5	18
2	1	4
2	2	5
2	3	6
2	4	7
2	5	8
21	2	21
21	3	22
21	4	23
22	2	24
22	3	25
22	4	26
22	5	27
22	6	28
31	2	31
31	3	32
31	4	33
32	2	34
32	3	35
32	4	36
32	5	37
32	6	38
insert into t1(c1,c2,c3) select c1,c2,c3 from tmp;
drop table tmp;
#
# Delete with a limit and an order by
#
create table tmp as select * from t1 where c1 in (select a.c2 from t1 a where a.c3 = t1.c3)
order by c3 desc limit 1;
explain select * from t1 where c1 in (select a.c2 from t1 a where a.c3 = t1.c3)
order by c3 desc limit 1;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	32	Using temporary; Using filesort
1	PRIMARY	a	ALL	NULL	NULL	NULL	NULL	32	Using where; FirstMatch(t1); Using join buffer (flat, BNL join)
explain delete from t1 where c1 in (select a.c2 from t1 a where a.c3 = t1.c3)
order by c3 desc limit 1;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	32	Using where; Using filesort
2	DEPENDENT SUBQUERY	a	ALL	NULL	NULL	NULL	NULL	32	Using where
delete from t1 where c1 in (select a.c2 from t1 a where a.c3 = t1.c3)
order by c3 desc limit 1;
affected rows: 1
select * from t1;
c1	c2	c3
1	1	1
1	2	2
1	3	3
11	1	11
11	2	12
11	3	13
12	1	14
12	2	15
12	3	16
12	4	17
12	5	18
2	1	4
2	3	6
2	4	7
2	5	8
21	2	21
21	3	22
21	4	23
22	2	24
22	3	25
22	4	26
22	5	27
22	6	28
31	2	31
31	3	32
31	4	33
32	2	34
32	3	35
32	4	36
32	5	37
32	6	38
insert into t1(c1,c2,c3) select c1,c2,c3 from tmp;
drop table tmp;
#
# Delete: 2 execution of PS
#
prepare create_tmp_stmt from
"create table tmp as select * from t1
      where c2=(select a.c3 from t1 a where a.c3 = ?)";
prepare delete_t1_stmt from
"delete from t1 where c2=(select a.c3 from t1 a where a.c3 = ?)";
set @a:=5;
execute create_tmp_stmt using @a;
execute delete_t1_stmt using @a;
execute delete_t1_stmt using @a;
select * from t1;
c1	c2	c3
1	1	1
1	2	2
1	3	3
11	1	11
11	2	12
11	3	13
12	1	14
12	2	15
12	3	16
12	4	17
2	1	4
2	2	5
2	3	6
2	4	7
21	2	21
21	3	22
21	4	23
22	2	24
22	3	25
22	4	26
22	6	28
31	2	31
31	3	32
31	4	33
32	2	34
32	3	35
32	4	36
32	6	38
prepare insert_tmp_stmt from
"insert into tmp(c1,c2,c3) select * from t1
      where c2=(select a.c3 from t1 a where a.c3 = ?)";
set @a:=2;
execute insert_tmp_stmt using @a;
execute delete_t1_stmt using @a;
select * from t1;
c1	c2	c3
1	1	1
1	3	3
11	1	11
11	3	13
12	1	14
12	3	16
12	4	17
2	1	4
2	3	6
2	4	7
21	3	22
21	4	23
22	3	25
22	4	26
22	6	28
31	3	32
31	4	33
32	3	35
32	4	36
32	6	38
insert into t1(c1,c2,c3) select c1,c2,c3 from tmp;
select * from t1;
c1	c2	c3
1	1	1
1	2	2
1	3	3
11	1	11
11	2	12
11	3	13
12	1	14
12	2	15
12	3	16
12	4	17
12	5	18
2	1	4
2	2	5
2	3	6
2	4	7
2	5	8
21	2	21
21	3	22
21	4	23
22	2	24
22	3	25
22	4	26
22	5	27
22	6	28
31	2	31
31	3	32
31	4	33
32	2	34
32	3	35
32	4	36
32	5	37
32	6	38
drop table tmp;
#
# Delete in stored procedure
#
create procedure sp()
begin
delete from t1 where c1 in (select a.c2 from t1 a where a.c3 = t1.c3)
order by c3 desc limit 1;
end
//
create table tmp as select * from t1
where c1 in (select a.c2 from t1 a where a.c3 = t1.c3)
order by c3 desc limit 1;
CALL sp;
insert into tmp(c1,c2,c3) select * from t1
where c1 in (select a.c2 from t1 a where a.c3 = t1.c3)
order by c3 desc limit 1;
CALL sp;
insert into tmp(c1,c2,c3) select * from t1
where c1 in (select a.c2 from t1 a where a.c3 = t1.c3)
order by c3 desc limit 1;
CALL sp;
select * from t1;
c1	c2	c3
1	2	2
1	3	3
11	1	11
11	2	12
11	3	13
12	1	14
12	2	15
12	3	16
12	4	17
12	5	18
2	1	4
2	3	6
2	4	7
2	5	8
21	2	21
21	3	22
21	4	23
22	2	24
22	3	25
22	4	26
22	5	27
22	6	28
31	2	31
31	3	32
31	4	33
32	2	34
32	3	35
32	4	36
32	5	37
32	6	38
insert into t1(c1,c2,c3) select c1,c2,c3 from tmp;
drop procedure sp;
drop table tmp;
#
# Delete in stored function
#
create function f1(IN a INT) returns int
begin
delete from t1 where c3 < a  order by c3 limit 1;
return  1;
end;//
set @a:=7;
create table tmp as select * from t1 where c3 < @a
order by c3 limit 1;
select f1(@a);
f1(@a)
1
insert into tmp(c1,c2,c3) select * from t1 where c3 < @a
order by c3 limit 1;
select f1(@a);
f1(@a)
1
select * from t1;
c1	c2	c3
1	3	3
11	1	11
11	2	12
11	3	13
12	1	14
12	2	15
12	3	16
12	4	17
12	5	18
2	1	4
2	2	5
2	3	6
2	4	7
2	5	8
21	2	21
21	3	22
21	4	23
22	2	24
22	3	25
22	4	26
22	5	27
22	6	28
31	2	31
31	3	32
31	4	33
32	2	34
32	3	35
32	4	36
32	5	37
32	6	38
insert into t1(c1,c2,c3) select c1,c2,c3 from tmp;
drop function f1;
drop table tmp;
#
# Delete in trigger
#
create table t2 (c1 integer);
insert into t2(c1) values (1), (2), (3), (4), (5), (6), (7), (8);
CREATE TABLE cnt(del integer);
INSERT INTO cnt VALUES(0);
CREATE TRIGGER tr1 AFTER DELETE ON t1 FOR EACH ROW
UPDATE cnt SET del=del+1;
CREATE TRIGGER tr2 AFTER DELETE ON t1 FOR EACH ROW
DELETE FROM t2 WHERE c1> (SELECT count(*)-1 FROM t2);
CREATE TABLE tmp as SELECT * FROM t1 WHERE c2>=3;
DELETE FROM t1 WHERE c2>=3;
affected rows: 20
select * from t1;
c1	c2	c3
1	1	1
1	2	2
11	1	11
11	2	12
12	1	14
12	2	15
2	1	4
2	2	5
21	2	21
22	2	24
31	2	31
32	2	34
SELECT * FROM t2;
c1
SELECT * FROM cnt;
del
20
insert into t1(c1,c2,c3) select c1,c2,c3 from tmp;
DROP TRIGGER tr1;
DROP TRIGGER tr2;
drop table t2, cnt, tmp;
#
# Delete with a reference to view in subquery
#
create table tmp as select * from t1 where t1.c2 in ( select max(a.c2) from v1 a
where a.c1 = t1.c1);
explain select * from t1 where t1.c2 in ( select max(a.c2) from v1 a
where a.c1 = t1.c1);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	32	Using where
2	DEPENDENT SUBQUERY	t1	ALL	NULL	NULL	NULL	NULL	32	Using where
explain delete from t1 where t1.c2 in ( select max(a.c2) from v1 a
where a.c1 = t1.c1);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	32	Using where
2	DEPENDENT SUBQUERY	t1	ALL	NULL	NULL	NULL	NULL	32	Using where
analyze delete from t1 where t1.c2 in ( select max(a.c2) from v1 a
where a.c1 = t1.c1);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	r_rows	filtered	r_filtered	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	32	32.00	100.00	25.00	Using where
2	DEPENDENT SUBQUERY	t1	ALL	NULL	NULL	NULL	NULL	32	32.00	25.00	3.12	Using where
select * from t1;
c1	c2	c3
1	1	1
1	3	3
11	1	11
11	3	13
12	1	14
12	3	16
12	4	17
12	5	18
2	1	4
2	3	6
2	4	7
2	5	8
21	3	22
21	4	23
22	3	25
22	4	26
22	5	27
22	6	28
31	3	32
31	4	33
32	3	35
32	4	36
32	5	37
32	6	38
insert into t1(c1,c2,c3) select c1,c2,c3 from tmp;
drop table tmp;
#######################################
#          Test with an index         #
#######################################
create index t1_c2 on t1 (c2,c1);
#
# Delete with value from subquery on the same table
#
analyze table t1 persistent for all;
Table	Op	Msg_type	Msg_text
test.t1	analyze	status	Engine-independent statistics collected
test.t1	analyze	status	OK
create table tmp as select * from t1 where c1=(select a.c3 from t1 a where a.c3 = t1.c3);
explain select * from t1 where c1=(select a.c3 from t1 a where a.c3 = t1.c3);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	32	Using where
2	DEPENDENT SUBQUERY	a	ALL	NULL	NULL	NULL	NULL	32	Using where
explain delete from t1 where c1=(select a.c3 from t1 a where a.c3 = t1.c3);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	32	Using where
2	DEPENDENT SUBQUERY	a	ALL	NULL	NULL	NULL	NULL	32	Using where
delete from t1 where c1=(select a.c3 from t1 a where a.c3 = t1.c3);
affected rows: 4
select * from t1;
c1	c2	c3
1	2	2
1	3	3
11	2	12
11	3	13
12	1	14
12	2	15
12	3	16
12	4	17
12	5	18
2	1	4
2	2	5
2	3	6
2	4	7
2	5	8
21	3	22
21	4	23
22	2	24
22	3	25
22	4	26
22	5	27
22	6	28
31	3	32
31	4	33
32	2	34
32	3	35
32	4	36
32	5	37
32	6	38
insert into t1(c1,c2,c3) select c1,c2,c3 from tmp;
drop table tmp;
#
# Delete with EXISTS subquery over the updated table
# in WHERE + possibly sargable condition
#
analyze table t1 persistent for all;
Table	Op	Msg_type	Msg_text
test.t1	analyze	status	Engine-independent statistics collected
test.t1	analyze	status	OK
create table tmp as select * from t1 where c1 = 1 and exists (select 'X' from t1 a where a.c1 = t1.c2);
explain select * from t1 where c1 = 1 and exists (select 'X' from t1 a where a.c1 = t1.c2);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	t1_c2	NULL	NULL	NULL	32	Using where
1	PRIMARY	a	index	NULL	t1_c2	10	NULL	32	Using where; Using index; FirstMatch(t1); Using join buffer (flat, BNL join)
explain delete from t1 where c1 = 1 and exists (select 'X' from t1 a where a.c1 = t1.c2);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	t1_c2	NULL	NULL	NULL	32	Using where
1	PRIMARY	a	index	NULL	t1_c2	10	NULL	32	Using where; Using index; FirstMatch(t1)
analyze delete from t1 where c1 = 1 and exists (select 'X' from t1 a where a.c1 = t1.c2);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	r_rows	filtered	r_filtered	Extra
1	PRIMARY	t1	ALL	t1_c2	NULL	NULL	NULL	32	32.00	9.38	9.38	Using where
1	PRIMARY	a	index	NULL	t1_c2	10	NULL	32	11.67	3.12	5.71	Using where; Using index; FirstMatch(t1)
select * from t1;
c1	c2	c3
1	3	3
11	1	11
11	2	12
11	3	13
12	1	14
12	2	15
12	3	16
12	4	17
12	5	18
2	1	4
2	2	5
2	3	6
2	4	7
2	5	8
21	2	21
21	3	22
21	4	23
22	2	24
22	3	25
22	4	26
22	5	27
22	6	28
31	2	31
31	3	32
31	4	33
32	2	34
32	3	35
32	4	36
32	5	37
32	6	38
insert into t1(c1,c2,c3) select c1,c2,c3 from tmp;
drop table tmp;
#
# Delete with IN predicand over the updated table in WHERE
#
create table tmp as select * from t1 where c3 in (select distinct a.c1 from t1 a where t1.c2=a.c2);
explain select * from t1 where c3 in (select distinct a.c1 from t1 a where t1.c2=a.c2);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	t1_c2	NULL	NULL	NULL	32	Using where
1	PRIMARY	a	ref	t1_c2	t1_c2	10	test.t1.c2,test.t1.c3	1	Using index; FirstMatch(t1)
explain delete from t1 where c3 in (select distinct a.c1 from t1 a where t1.c2=a.c2);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	t1_c2	NULL	NULL	NULL	32	Using where
1	PRIMARY	a	ref	t1_c2	t1_c2	10	test.t1.c2,test.t1.c3	1	Using index; FirstMatch(t1)
delete from t1 where c3 in (select distinct a.c1 from t1 a where t1.c2=a.c2);
affected rows: 8
select * from t1;
c1	c2	c3
1	3	3
11	3	13
12	1	14
12	2	15
12	3	16
12	4	17
12	5	18
2	1	4
2	2	5
2	3	6
2	4	7
2	5	8
21	4	23
22	2	24
22	3	25
22	4	26
22	5	27
22	6	28
31	4	33
32	2	34
32	3	35
32	4	36
32	5	37
32	6	38
insert into t1(c1,c2,c3) select c1,c2,c3 from tmp;
drop table tmp;
#
# Delete with a limit - can be deleted
#
create table tmp as select * from t1 where c1 in (select a.c2 from t1 a where a.c2 = t1.c3) limit 1;
explain select * from t1 where c1 in (select a.c2 from t1 a where a.c2 = t1.c3) limit 1;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	32	Using where
1	PRIMARY	a	ref	t1_c2	t1_c2	5	test.t1.c1	5	Using index; FirstMatch(t1)
explain delete from t1 where c1 in (select a.c2 from t1 a where a.c2 = t1.c3) limit 1;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	32	Using where
1	PRIMARY	a	ref	t1_c2	t1_c2	5	test.t1.c1	5	Using index; FirstMatch(t1)
analyze delete from t1 where c1 in (select a.c2 from t1 a where a.c2 = t1.c3) limit 1;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	r_rows	filtered	r_filtered	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	32	32.00	100.00	12.50	Using where
1	PRIMARY	a	ref	t1_c2	t1_c2	5	test.t1.c1	5	0.25	18.75	100.00	Using index; FirstMatch(t1)
select * from t1;
c1	c2	c3
1	2	2
1	3	3
11	1	11
11	2	12
11	3	13
12	1	14
12	2	15
12	3	16
12	4	17
12	5	18
2	1	4
2	2	5
2	3	6
2	4	7
2	5	8
21	2	21
21	3	22
21	4	23
22	2	24
22	3	25
22	4	26
22	5	27
22	6	28
31	2	31
31	3	32
31	4	33
32	2	34
32	3	35
32	4	36
32	5	37
32	6	38
insert into t1(c1,c2,c3) select c1,c2,c3 from tmp;
drop table tmp;
#
# Delete with a limit and an order by
#
create table tmp as select * from t1 where c1 in (select a.c2 from t1 a where a.c3 = t1.c3)
order by c3 desc limit 1;
explain select * from t1 where c1 in (select a.c2 from t1 a where a.c3 = t1.c3)
order by c3 desc limit 1;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	32	Using temporary; Using filesort
1	PRIMARY	a	ALL	t1_c2	NULL	NULL	NULL	32	Using where; FirstMatch(t1); Using join buffer (flat, BNL join)
explain delete from t1 where c1 in (select a.c2 from t1 a where a.c3 = t1.c3)
order by c3 desc limit 1;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	32	Using where; Using filesort
2	DEPENDENT SUBQUERY	a	index_subquery	t1_c2	t1_c2	5	func	5	Using where
delete from t1 where c1 in (select a.c2 from t1 a where a.c3 = t1.c3)
order by c3 desc limit 1;
affected rows: 1
select * from t1;
c1	c2	c3
1	1	1
1	2	2
1	3	3
11	1	11
11	2	12
11	3	13
12	1	14
12	2	15
12	3	16
12	4	17
12	5	18
2	1	4
2	3	6
2	4	7
2	5	8
21	2	21
21	3	22
21	4	23
22	2	24
22	3	25
22	4	26
22	5	27
22	6	28
31	2	31
31	3	32
31	4	33
32	2	34
32	3	35
32	4	36
32	5	37
32	6	38
insert into t1(c1,c2,c3) select c1,c2,c3 from tmp;
drop table tmp;
#
# Delete: 2 execution of PS
#
prepare create_tmp_stmt from
"create table tmp as select * from t1
      where c2=(select a.c3 from t1 a where a.c3 = ?)";
prepare delete_t1_stmt from
"delete from t1 where c2=(select a.c3 from t1 a where a.c3 = ?)";
set @a:=5;
execute create_tmp_stmt using @a;
execute delete_t1_stmt using @a;
execute delete_t1_stmt using @a;
select * from t1;
c1	c2	c3
1	1	1
1	2	2
1	3	3
11	1	11
11	2	12
11	3	13
12	1	14
12	2	15
12	3	16
12	4	17
2	1	4
2	2	5
2	3	6
2	4	7
21	2	21
21	3	22
21	4	23
22	2	24
22	3	25
22	4	26
22	6	28
31	2	31
31	3	32
31	4	33
32	2	34
32	3	35
32	4	36
32	6	38
prepare insert_tmp_stmt from
"insert into tmp(c1,c2,c3) select * from t1
      where c2=(select a.c3 from t1 a where a.c3 = ?)";
set @a:=2;
execute insert_tmp_stmt using @a;
execute delete_t1_stmt using @a;
select * from t1;
c1	c2	c3
1	1	1
1	3	3
11	1	11
11	3	13
12	1	14
12	3	16
12	4	17
2	1	4
2	3	6
2	4	7
21	3	22
21	4	23
22	3	25
22	4	26
22	6	28
31	3	32
31	4	33
32	3	35
32	4	36
32	6	38
insert into t1(c1,c2,c3) select c1,c2,c3 from tmp;
select * from t1;
c1	c2	c3
1	1	1
1	2	2
1	3	3
11	1	11
11	2	12
11	3	13
12	1	14
12	2	15
12	3	16
12	4	17
12	5	18
2	1	4
2	2	5
2	3	6
2	4	7
2	5	8
21	2	21
21	3	22
21	4	23
22	2	24
22	3	25
22	4	26
22	5	27
22	6	28
31	2	31
31	3	32
31	4	33
32	2	34
32	3	35
32	4	36
32	5	37
32	6	38
drop table tmp;
#
# Delete in stored procedure
#
create procedure sp()
begin
delete from t1 where c1 in (select a.c2 from t1 a where a.c3 = t1.c3)
order by c3 desc limit 1;
end
//
create table tmp as select * from t1
where c1 in (select a.c2 from t1 a where a.c3 = t1.c3)
order by c3 desc limit 1;
CALL sp;
insert into tmp(c1,c2,c3) select * from t1
where c1 in (select a.c2 from t1 a where a.c3 = t1.c3)
order by c3 desc limit 1;
CALL sp;
insert into tmp(c1,c2,c3) select * from t1
where c1 in (select a.c2 from t1 a where a.c3 = t1.c3)
order by c3 desc limit 1;
CALL sp;
select * from t1;
c1	c2	c3
1	2	2
1	3	3
11	1	11
11	2	12
11	3	13
12	1	14
12	2	15
12	3	16
12	4	17
12	5	18
2	1	4
2	3	6
2	4	7
2	5	8
21	2	21
21	3	22
21	4	23
22	2	24
22	3	25
22	4	26
22	5	27
22	6	28
31	2	31
31	3	32
31	4	33
32	2	34
32	3	35
32	4	36
32	5	37
32	6	38
insert into t1(c1,c2,c3) select c1,c2,c3 from tmp;
drop procedure sp;
drop table tmp;
#
# Delete in stored function
#
create function f1(IN a INT) returns int
begin
delete from t1 where c3 < a  order by c3 limit 1;
return  1;
end;//
set @a:=7;
create table tmp as select * from t1 where c3 < @a
order by c3 limit 1;
select f1(@a);
f1(@a)
1
insert into tmp(c1,c2,c3) select * from t1 where c3 < @a
order by c3 limit 1;
select f1(@a);
f1(@a)
1
select * from t1;
c1	c2	c3
1	3	3
11	1	11
11	2	12
11	3	13
12	1	14
12	2	15
12	3	16
12	4	17
12	5	18
2	1	4
2	2	5
2	3	6
2	4	7
2	5	8
21	2	21
21	3	22
21	4	23
22	2	24
22	3	25
22	4	26
22	5	27
22	6	28
31	2	31
31	3	32
31	4	33
32	2	34
32	3	35
32	4	36
32	5	37
32	6	38
insert into t1(c1,c2,c3) select c1,c2,c3 from tmp;
drop function f1;
drop table tmp;
#
# Delete in trigger
#
create table t2 (c1 integer);
insert into t2(c1) values (1), (2), (3), (4), (5), (6), (7), (8);
CREATE TABLE cnt(del integer);
INSERT INTO cnt VALUES(0);
CREATE TRIGGER tr1 AFTER DELETE ON t1 FOR EACH ROW
UPDATE cnt SET del=del+1;
CREATE TRIGGER tr2 AFTER DELETE ON t1 FOR EACH ROW
DELETE FROM t2 WHERE c1> (SELECT count(*)-1 FROM t2);
CREATE TABLE tmp as SELECT * FROM t1 WHERE c2>=3;
DELETE FROM t1 WHERE c2>=3;
affected rows: 20
select * from t1;
c1	c2	c3
1	1	1
1	2	2
11	1	11
11	2	12
12	1	14
12	2	15
2	1	4
2	2	5
21	2	21
22	2	24
31	2	31
32	2	34
SELECT * FROM t2;
c1
SELECT * FROM cnt;
del
20
insert into t1(c1,c2,c3) select c1,c2,c3 from tmp;
DROP TRIGGER tr1;
DROP TRIGGER tr2;
drop table t2, cnt, tmp;
#
# Delete with a reference to view in subquery
#
create table tmp as select * from t1 where t1.c2 in ( select max(a.c2) from v1 a
where a.c1 = t1.c1);
explain select * from t1 where t1.c2 in ( select max(a.c2) from v1 a
where a.c1 = t1.c1);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	32	Using where
2	DEPENDENT SUBQUERY	t1	ref	t1_c2	t1_c2	10	const,test.t1.c1	1	Using index
explain delete from t1 where t1.c2 in ( select max(a.c2) from v1 a
where a.c1 = t1.c1);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	32	Using where
2	DEPENDENT SUBQUERY	t1	ref	t1_c2	t1_c2	10	const,test.t1.c1	1	Using index
analyze delete from t1 where t1.c2 in ( select max(a.c2) from v1 a
where a.c1 = t1.c1);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	r_rows	filtered	r_filtered	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	32	32.00	100.00	25.00	Using where
2	DEPENDENT SUBQUERY	t1	ref	t1_c2	t1_c2	10	const,test.t1.c1	1	1.00	100.00	100.00	Using index
select * from t1;
c1	c2	c3
1	1	1
1	3	3
11	1	11
11	3	13
12	1	14
12	3	16
12	4	17
12	5	18
2	1	4
2	3	6
2	4	7
2	5	8
21	3	22
21	4	23
22	3	25
22	4	26
22	5	27
22	6	28
31	3	32
31	4	33
32	3	35
32	4	36
32	5	37
32	6	38
insert into t1(c1,c2,c3) select c1,c2,c3 from tmp;
drop table tmp;
#######################################
#       Test with a primary key       #
#######################################
drop index t1_c2 on t1;
alter table t1 add primary key (c3);
#
# Delete with value from subquery on the same table
#
analyze table t1 persistent for all;
Table	Op	Msg_type	Msg_text
test.t1	analyze	status	Engine-independent statistics collected
test.t1	analyze	status	OK
create table tmp as select * from t1 where c1=(select a.c3 from t1 a where a.c3 = t1.c3);
explain select * from t1 where c1=(select a.c3 from t1 a where a.c3 = t1.c3);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	32	Using where
2	DEPENDENT SUBQUERY	a	eq_ref	PRIMARY	PRIMARY	4	test.t1.c3	1	
explain delete from t1 where c1=(select a.c3 from t1 a where a.c3 = t1.c3);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	32	Using where
2	DEPENDENT SUBQUERY	a	eq_ref	PRIMARY	PRIMARY	4	test.t1.c3	1	
delete from t1 where c1=(select a.c3 from t1 a where a.c3 = t1.c3);
affected rows: 4
select * from t1;
c1	c2	c3
1	2	2
1	3	3
11	2	12
11	3	13
12	1	14
12	2	15
12	3	16
12	4	17
12	5	18
2	1	4
2	2	5
2	3	6
2	4	7
2	5	8
21	3	22
21	4	23
22	2	24
22	3	25
22	4	26
22	5	27
22	6	28
31	3	32
31	4	33
32	2	34
32	3	35
32	4	36
32	5	37
32	6	38
insert into t1(c1,c2,c3) select c1,c2,c3 from tmp;
drop table tmp;
#
# Delete with EXISTS subquery over the updated table
# in WHERE + possibly sargable condition
#
analyze table t1 persistent for all;
Table	Op	Msg_type	Msg_text
test.t1	analyze	status	Engine-independent statistics collected
test.t1	analyze	status	OK
create table tmp as select * from t1 where c1 = 1 and exists (select 'X' from t1 a where a.c1 = t1.c2);
explain select * from t1 where c1 = 1 and exists (select 'X' from t1 a where a.c1 = t1.c2);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	32	Using where
1	PRIMARY	a	ALL	NULL	NULL	NULL	NULL	32	Using where; FirstMatch(t1); Using join buffer (flat, BNL join)
explain delete from t1 where c1 = 1 and exists (select 'X' from t1 a where a.c1 = t1.c2);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	32	Using where
1	PRIMARY	a	ALL	NULL	NULL	NULL	NULL	32	Using where; FirstMatch(t1)
analyze delete from t1 where c1 = 1 and exists (select 'X' from t1 a where a.c1 = t1.c2);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	r_rows	filtered	r_filtered	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	32	32.00	9.38	9.38	Using where
1	PRIMARY	a	ALL	NULL	NULL	NULL	NULL	32	12.33	3.12	5.41	Using where; FirstMatch(t1)
select * from t1;
c1	c2	c3
1	3	3
11	1	11
11	2	12
11	3	13
12	1	14
12	2	15
12	3	16
12	4	17
12	5	18
2	1	4
2	2	5
2	3	6
2	4	7
2	5	8
21	2	21
21	3	22
21	4	23
22	2	24
22	3	25
22	4	26
22	5	27
22	6	28
31	2	31
31	3	32
31	4	33
32	2	34
32	3	35
32	4	36
32	5	37
32	6	38
insert into t1(c1,c2,c3) select c1,c2,c3 from tmp;
drop table tmp;
#
# Delete with IN predicand over the updated table in WHERE
#
create table tmp as select * from t1 where c3 in (select distinct a.c1 from t1 a where t1.c2=a.c2);
explain select * from t1 where c3 in (select distinct a.c1 from t1 a where t1.c2=a.c2);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	a	ALL	NULL	NULL	NULL	NULL	32	Using where; Start temporary
1	PRIMARY	t1	eq_ref	PRIMARY	PRIMARY	4	test.a.c1	1	Using where; End temporary
explain delete from t1 where c3 in (select distinct a.c1 from t1 a where t1.c2=a.c2);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	a	ALL	NULL	NULL	NULL	NULL	32	Using where; Start temporary
1	PRIMARY	t1	eq_ref	PRIMARY	PRIMARY	4	test.a.c1	1	Using where; End temporary
delete from t1 where c3 in (select distinct a.c1 from t1 a where t1.c2=a.c2);
affected rows: 8
select * from t1;
c1	c2	c3
1	3	3
11	3	13
12	1	14
12	2	15
12	3	16
12	4	17
12	5	18
2	1	4
2	2	5
2	3	6
2	4	7
2	5	8
21	4	23
22	2	24
22	3	25
22	4	26
22	5	27
22	6	28
31	4	33
32	2	34
32	3	35
32	4	36
32	5	37
32	6	38
insert into t1(c1,c2,c3) select c1,c2,c3 from tmp;
drop table tmp;
#
# Delete with a limit - can be deleted
#
create table tmp as select * from t1 where c1 in (select a.c2 from t1 a where a.c2 = t1.c3) limit 1;
explain select * from t1 where c1 in (select a.c2 from t1 a where a.c2 = t1.c3) limit 1;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	a	ALL	NULL	NULL	NULL	NULL	32	Using where; Start temporary
1	PRIMARY	t1	eq_ref	PRIMARY	PRIMARY	4	test.a.c2	1	Using where; End temporary
explain delete from t1 where c1 in (select a.c2 from t1 a where a.c2 = t1.c3) limit 1;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	a	ALL	NULL	NULL	NULL	NULL	32	Using where; Start temporary
1	PRIMARY	t1	eq_ref	PRIMARY	PRIMARY	4	test.a.c2	1	Using where; End temporary
analyze delete from t1 where c1 in (select a.c2 from t1 a where a.c2 = t1.c3) limit 1;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	r_rows	filtered	r_filtered	Extra
1	PRIMARY	a	ALL	NULL	NULL	NULL	NULL	32	1.00	100.00	100.00	Using where; Start temporary
1	PRIMARY	t1	eq_ref	PRIMARY	PRIMARY	4	test.a.c2	1	1.00	3.12	100.00	Using where; End temporary
select * from t1;
c1	c2	c3
1	2	2
1	3	3
11	1	11
11	2	12
11	3	13
12	1	14
12	2	15
12	3	16
12	4	17
12	5	18
2	1	4
2	2	5
2	3	6
2	4	7
2	5	8
21	2	21
21	3	22
21	4	23
22	2	24
22	3	25
22	4	26
22	5	27
22	6	28
31	2	31
31	3	32
31	4	33
32	2	34
32	3	35
32	4	36
32	5	37
32	6	38
insert into t1(c1,c2,c3) select c1,c2,c3 from tmp;
drop table tmp;
#
# Delete with a limit and an order by
#
create table tmp as select * from t1 where c1 in (select a.c2 from t1 a where a.c3 = t1.c3)
order by c3 desc limit 1;
explain select * from t1 where c1 in (select a.c2 from t1 a where a.c3 = t1.c3)
order by c3 desc limit 1;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	index	PRIMARY	PRIMARY	4	NULL	1	
1	PRIMARY	a	eq_ref	PRIMARY	PRIMARY	4	test.t1.c3	1	Using where
explain delete from t1 where c1 in (select a.c2 from t1 a where a.c3 = t1.c3)
order by c3 desc limit 1;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	index	NULL	PRIMARY	4	NULL	1	Using where
2	DEPENDENT SUBQUERY	a	eq_ref	PRIMARY	PRIMARY	4	test.t1.c3	1	Using where
delete from t1 where c1 in (select a.c2 from t1 a where a.c3 = t1.c3)
order by c3 desc limit 1;
affected rows: 1
select * from t1;
c1	c2	c3
1	1	1
1	2	2
1	3	3
11	1	11
11	2	12
11	3	13
12	1	14
12	2	15
12	3	16
12	4	17
12	5	18
2	1	4
2	3	6
2	4	7
2	5	8
21	2	21
21	3	22
21	4	23
22	2	24
22	3	25
22	4	26
22	5	27
22	6	28
31	2	31
31	3	32
31	4	33
32	2	34
32	3	35
32	4	36
32	5	37
32	6	38
insert into t1(c1,c2,c3) select c1,c2,c3 from tmp;
drop table tmp;
#
# Delete: 2 execution of PS
#
prepare create_tmp_stmt from
"create table tmp as select * from t1
      where c2=(select a.c3 from t1 a where a.c3 = ?)";
prepare delete_t1_stmt from
"delete from t1 where c2=(select a.c3 from t1 a where a.c3 = ?)";
set @a:=5;
execute create_tmp_stmt using @a;
execute delete_t1_stmt using @a;
execute delete_t1_stmt using @a;
select * from t1;
c1	c2	c3
1	1	1
1	2	2
1	3	3
11	1	11
11	2	12
11	3	13
12	1	14
12	2	15
12	3	16
12	4	17
2	1	4
2	2	5
2	3	6
2	4	7
21	2	21
21	3	22
21	4	23
22	2	24
22	3	25
22	4	26
22	6	28
31	2	31
31	3	32
31	4	33
32	2	34
32	3	35
32	4	36
32	6	38
prepare insert_tmp_stmt from
"insert into tmp(c1,c2,c3) select * from t1
      where c2=(select a.c3 from t1 a where a.c3 = ?)";
set @a:=2;
execute insert_tmp_stmt using @a;
execute delete_t1_stmt using @a;
select * from t1;
c1	c2	c3
1	1	1
1	3	3
11	1	11
11	3	13
12	1	14
12	3	16
12	4	17
2	1	4
2	3	6
2	4	7
21	3	22
21	4	23
22	3	25
22	4	26
22	6	28
31	3	32
31	4	33
32	3	35
32	4	36
32	6	38
insert into t1(c1,c2,c3) select c1,c2,c3 from tmp;
select * from t1;
c1	c2	c3
1	1	1
1	2	2
1	3	3
11	1	11
11	2	12
11	3	13
12	1	14
12	2	15
12	3	16
12	4	17
12	5	18
2	1	4
2	2	5
2	3	6
2	4	7
2	5	8
21	2	21
21	3	22
21	4	23
22	2	24
22	3	25
22	4	26
22	5	27
22	6	28
31	2	31
31	3	32
31	4	33
32	2	34
32	3	35
32	4	36
32	5	37
32	6	38
drop table tmp;
#
# Delete in stored procedure
#
create procedure sp()
begin
delete from t1 where c1 in (select a.c2 from t1 a where a.c3 = t1.c3)
order by c3 desc limit 1;
end
//
create table tmp as select * from t1
where c1 in (select a.c2 from t1 a where a.c3 = t1.c3)
order by c3 desc limit 1;
CALL sp;
insert into tmp(c1,c2,c3) select * from t1
where c1 in (select a.c2 from t1 a where a.c3 = t1.c3)
order by c3 desc limit 1;
CALL sp;
insert into tmp(c1,c2,c3) select * from t1
where c1 in (select a.c2 from t1 a where a.c3 = t1.c3)
order by c3 desc limit 1;
CALL sp;
select * from t1;
c1	c2	c3
1	2	2
1	3	3
11	1	11
11	2	12
11	3	13
12	1	14
12	2	15
12	3	16
12	4	17
12	5	18
2	1	4
2	3	6
2	4	7
2	5	8
21	2	21
21	3	22
21	4	23
22	2	24
22	3	25
22	4	26
22	5	27
22	6	28
31	2	31
31	3	32
31	4	33
32	2	34
32	3	35
32	4	36
32	5	37
32	6	38
insert into t1(c1,c2,c3) select c1,c2,c3 from tmp;
drop procedure sp;
drop table tmp;
#
# Delete in stored function
#
create function f1(IN a INT) returns int
begin
delete from t1 where c3 < a  order by c3 limit 1;
return  1;
end;//
set @a:=7;
create table tmp as select * from t1 where c3 < @a
order by c3 limit 1;
select f1(@a);
f1(@a)
1
insert into tmp(c1,c2,c3) select * from t1 where c3 < @a
order by c3 limit 1;
select f1(@a);
f1(@a)
1
select * from t1;
c1	c2	c3
1	3	3
11	1	11
11	2	12
11	3	13
12	1	14
12	2	15
12	3	16
12	4	17
12	5	18
2	1	4
2	2	5
2	3	6
2	4	7
2	5	8
21	2	21
21	3	22
21	4	23
22	2	24
22	3	25
22	4	26
22	5	27
22	6	28
31	2	31
31	3	32
31	4	33
32	2	34
32	3	35
32	4	36
32	5	37
32	6	38
insert into t1(c1,c2,c3) select c1,c2,c3 from tmp;
drop function f1;
drop table tmp;
#
# Delete in trigger
#
create table t2 (c1 integer);
insert into t2(c1) values (1), (2), (3), (4), (5), (6), (7), (8);
CREATE TABLE cnt(del integer);
INSERT INTO cnt VALUES(0);
CREATE TRIGGER tr1 AFTER DELETE ON t1 FOR EACH ROW
UPDATE cnt SET del=del+1;
CREATE TRIGGER tr2 AFTER DELETE ON t1 FOR EACH ROW
DELETE FROM t2 WHERE c1> (SELECT count(*)-1 FROM t2);
CREATE TABLE tmp as SELECT * FROM t1 WHERE c2>=3;
DELETE FROM t1 WHERE c2>=3;
affected rows: 20
select * from t1;
c1	c2	c3
1	1	1
1	2	2
11	1	11
11	2	12
12	1	14
12	2	15
2	1	4
2	2	5
21	2	21
22	2	24
31	2	31
32	2	34
SELECT * FROM t2;
c1
SELECT * FROM cnt;
del
20
insert into t1(c1,c2,c3) select c1,c2,c3 from tmp;
DROP TRIGGER tr1;
DROP TRIGGER tr2;
drop table t2, cnt, tmp;
#
# Delete with a reference to view in subquery
#
create table tmp as select * from t1 where t1.c2 in ( select max(a.c2) from v1 a
where a.c1 = t1.c1);
explain select * from t1 where t1.c2 in ( select max(a.c2) from v1 a
where a.c1 = t1.c1);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	32	Using where
2	DEPENDENT SUBQUERY	t1	ALL	NULL	NULL	NULL	NULL	32	Using where
explain delete from t1 where t1.c2 in ( select max(a.c2) from v1 a
where a.c1 = t1.c1);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	32	Using where
2	DEPENDENT SUBQUERY	t1	ALL	NULL	NULL	NULL	NULL	32	Using where
analyze delete from t1 where t1.c2 in ( select max(a.c2) from v1 a
where a.c1 = t1.c1);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	r_rows	filtered	r_filtered	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	32	32.00	100.00	25.00	Using where
2	DEPENDENT SUBQUERY	t1	ALL	NULL	NULL	NULL	NULL	32	32.00	25.00	3.12	Using where
select * from t1;
c1	c2	c3
1	1	1
1	3	3
11	1	11
11	3	13
12	1	14
12	3	16
12	4	17
12	5	18
2	1	4
2	3	6
2	4	7
2	5	8
21	3	22
21	4	23
22	3	25
22	4	26
22	5	27
22	6	28
31	3	32
31	4	33
32	3	35
32	4	36
32	5	37
32	6	38
insert into t1(c1,c2,c3) select c1,c2,c3 from tmp;
drop table tmp;
drop view v1;
drop table t1;
#
# Test on dynamic columns (blob)
#
create table assets (
item_name varchar(32) primary key, -- A common attribute for all items
dynamic_cols  blob  -- Dynamic columns will be stored here
);
INSERT INTO assets
VALUES ('MariaDB T-shirt',
COLUMN_CREATE('color', 'blue', 'size', 'XL'));
INSERT INTO assets
VALUES ('Thinkpad Laptop',
COLUMN_CREATE('color', 'black', 'price', 500));
INSERT INTO assets
VALUES ('Fridge',
COLUMN_CREATE('color', 'white', 'warranty', '5 years'));
INSERT INTO assets
VALUES ('Microwave',
COLUMN_CREATE('warranty', '3 years'));
SELECT item_name, COLUMN_GET(dynamic_cols, 'color' as char) AS color
FROM assets ORDER BY item_name;
item_name	color
Fridge	white
MariaDB T-shirt	blue
Microwave	NULL
Thinkpad Laptop	black
UPDATE assets SET dynamic_cols=COLUMN_DELETE(dynamic_cols, 'color')
WHERE item_name='Fridge';
SELECT item_name, COLUMN_GET(dynamic_cols, 'color' as char) AS color
FROM assets ORDER BY item_name;
item_name	color
Fridge	NULL
MariaDB T-shirt	blue
Microwave	NULL
Thinkpad Laptop	black
DELETE FROM assets
WHERE item_name in
(select b.item_name from assets b
where COLUMN_GET(b.dynamic_cols, 'color' as char) ='black');
SELECT item_name, COLUMN_GET(dynamic_cols, 'color' as char) AS color
FROM assets ORDER BY item_name;
item_name	color
Fridge	NULL
MariaDB T-shirt	blue
Microwave	NULL
DELETE FROM assets WHERE item_name='Microwave';
SELECT item_name, COLUMN_GET(dynamic_cols, 'color' as char) AS color
FROM assets ORDER BY item_name;
item_name	color
Fridge	NULL
MariaDB T-shirt	blue
drop table assets ;
#
# Test on fulltext columns
#
CREATE TABLE ft2(copy TEXT,FULLTEXT(copy));
INSERT INTO ft2(copy) VALUES
('MySQL vs MariaDB database'),
('Oracle vs MariaDB database'),
('PostgreSQL vs MariaDB database'),
('MariaDB overview'),
('Foreign keys'),
('Primary keys'),
('Indexes'),
('Transactions'),
('Triggers');
SELECT * FROM ft2 WHERE MATCH(copy) AGAINST('database');
copy
MySQL vs MariaDB database
Oracle vs MariaDB database
PostgreSQL vs MariaDB database
DELETE FROM ft2 WHERE  MATCH(copy) AGAINST('database');
SELECT * FROM ft2 WHERE MATCH(copy) AGAINST('database');
copy
drop table ft2;
#######################################
#                                     #
#            Engine Aria              #
#                                     #
#######################################
set default_storage_engine=Aria;
create table t1 (c1 integer, c2 integer, c3 integer);
insert into t1(c1,c2,c3)
values (1,1,1),(1,2,2),(1,3,3),
(2,1,4),(2,2,5),(2,3,6),
(2,4,7),(2,5,8);
insert into t1 select c1+10,c2,c3+10 from t1;
insert into t1 select c1+20,c2+1,c3+20 from t1;
analyze table t1 persistent for all;
Table	Op	Msg_type	Msg_text
test.t1	analyze	status	Engine-independent statistics collected
test.t1	analyze	status	OK
create view v1 as select * from t1 where c2=2;
#######################################
#        Test without any index       #
#######################################
#
# Delete with value from subquery on the same table
#
analyze table t1 persistent for all;
Table	Op	Msg_type	Msg_text
test.t1	analyze	status	Engine-independent statistics collected
test.t1	analyze	status	Table is already up to date
create table tmp as select * from t1 where c1=(select a.c3 from t1 a where a.c3 = t1.c3);
explain select * from t1 where c1=(select a.c3 from t1 a where a.c3 = t1.c3);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	32	Using where
2	DEPENDENT SUBQUERY	a	ALL	NULL	NULL	NULL	NULL	32	Using where
explain delete from t1 where c1=(select a.c3 from t1 a where a.c3 = t1.c3);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	32	Using where
2	DEPENDENT SUBQUERY	a	ALL	NULL	NULL	NULL	NULL	32	Using where
delete from t1 where c1=(select a.c3 from t1 a where a.c3 = t1.c3);
affected rows: 4
select * from t1;
c1	c2	c3
1	2	2
1	3	3
11	2	12
11	3	13
12	1	14
12	2	15
12	3	16
12	4	17
12	5	18
2	1	4
2	2	5
2	3	6
2	4	7
2	5	8
21	3	22
21	4	23
22	2	24
22	3	25
22	4	26
22	5	27
22	6	28
31	3	32
31	4	33
32	2	34
32	3	35
32	4	36
32	5	37
32	6	38
insert into t1(c1,c2,c3) select c1,c2,c3 from tmp;
drop table tmp;
#
# Delete with EXISTS subquery over the updated table
# in WHERE + possibly sargable condition
#
analyze table t1 persistent for all;
Table	Op	Msg_type	Msg_text
test.t1	analyze	status	Engine-independent statistics collected
test.t1	analyze	status	OK
create table tmp as select * from t1 where c1 = 1 and exists (select 'X' from t1 a where a.c1 = t1.c2);
explain select * from t1 where c1 = 1 and exists (select 'X' from t1 a where a.c1 = t1.c2);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	32	Using where
1	PRIMARY	a	ALL	NULL	NULL	NULL	NULL	32	Using where; FirstMatch(t1); Using join buffer (flat, BNL join)
explain delete from t1 where c1 = 1 and exists (select 'X' from t1 a where a.c1 = t1.c2);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	32	Using where
1	PRIMARY	a	ALL	NULL	NULL	NULL	NULL	32	Using where; FirstMatch(t1)
analyze delete from t1 where c1 = 1 and exists (select 'X' from t1 a where a.c1 = t1.c2);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	r_rows	filtered	r_filtered	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	32	32.00	9.38	9.38	Using where
1	PRIMARY	a	ALL	NULL	NULL	NULL	NULL	32	12.67	3.12	5.26	Using where; FirstMatch(t1)
select * from t1;
c1	c2	c3
1	3	3
11	1	11
11	2	12
11	3	13
12	1	14
12	2	15
12	3	16
12	4	17
12	5	18
2	1	4
2	2	5
2	3	6
2	4	7
2	5	8
21	2	21
21	3	22
21	4	23
22	2	24
22	3	25
22	4	26
22	5	27
22	6	28
31	2	31
31	3	32
31	4	33
32	2	34
32	3	35
32	4	36
32	5	37
32	6	38
insert into t1(c1,c2,c3) select c1,c2,c3 from tmp;
drop table tmp;
#
# Delete with IN predicand over the updated table in WHERE
#
create table tmp as select * from t1 where c3 in (select distinct a.c1 from t1 a where t1.c2=a.c2);
explain select * from t1 where c3 in (select distinct a.c1 from t1 a where t1.c2=a.c2);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	32	
1	PRIMARY	a	ALL	NULL	NULL	NULL	NULL	32	Using where; FirstMatch(t1); Using join buffer (flat, BNL join)
explain delete from t1 where c3 in (select distinct a.c1 from t1 a where t1.c2=a.c2);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	32	
1	PRIMARY	a	ALL	NULL	NULL	NULL	NULL	32	Using where; FirstMatch(t1)
delete from t1 where c3 in (select distinct a.c1 from t1 a where t1.c2=a.c2);
affected rows: 8
select * from t1;
c1	c2	c3
1	3	3
11	3	13
12	1	14
12	2	15
12	3	16
12	4	17
12	5	18
2	1	4
2	2	5
2	3	6
2	4	7
2	5	8
21	4	23
22	2	24
22	3	25
22	4	26
22	5	27
22	6	28
31	4	33
32	2	34
32	3	35
32	4	36
32	5	37
32	6	38
insert into t1(c1,c2,c3) select c1,c2,c3 from tmp;
drop table tmp;
#
# Delete with a limit - can be deleted
#
create table tmp as select * from t1 where c1 in (select a.c2 from t1 a where a.c2 = t1.c3) limit 1;
explain select * from t1 where c1 in (select a.c2 from t1 a where a.c2 = t1.c3) limit 1;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	32	Using where
1	PRIMARY	a	ALL	NULL	NULL	NULL	NULL	32	Using where; FirstMatch(t1); Using join buffer (flat, BNL join)
explain delete from t1 where c1 in (select a.c2 from t1 a where a.c2 = t1.c3) limit 1;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	32	Using where
1	PRIMARY	a	ALL	NULL	NULL	NULL	NULL	32	Using where; FirstMatch(t1)
analyze delete from t1 where c1 in (select a.c2 from t1 a where a.c2 = t1.c3) limit 1;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	r_rows	filtered	r_filtered	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	32	25.00	100.00	12.00	Using where
1	PRIMARY	a	ALL	NULL	NULL	NULL	NULL	32	22.67	3.12	1.47	Using where; FirstMatch(t1)
select * from t1;
c1	c2	c3
1	2	2
1	3	3
11	1	11
11	2	12
11	3	13
12	1	14
12	2	15
12	3	16
12	4	17
12	5	18
2	1	4
2	2	5
2	3	6
2	4	7
2	5	8
21	2	21
21	3	22
21	4	23
22	2	24
22	3	25
22	4	26
22	5	27
22	6	28
31	2	31
31	3	32
31	4	33
32	2	34
32	3	35
32	4	36
32	5	37
32	6	38
insert into t1(c1,c2,c3) select c1,c2,c3 from tmp;
drop table tmp;
#
# Delete with a limit and an order by
#
create table tmp as select * from t1 where c1 in (select a.c2 from t1 a where a.c3 = t1.c3)
order by c3 desc limit 1;
explain select * from t1 where c1 in (select a.c2 from t1 a where a.c3 = t1.c3)
order by c3 desc limit 1;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	32	Using temporary; Using filesort
1	PRIMARY	a	ALL	NULL	NULL	NULL	NULL	32	Using where; FirstMatch(t1); Using join buffer (flat, BNL join)
explain delete from t1 where c1 in (select a.c2 from t1 a where a.c3 = t1.c3)
order by c3 desc limit 1;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	32	Using where; Using filesort
2	DEPENDENT SUBQUERY	a	ALL	NULL	NULL	NULL	NULL	32	Using where
delete from t1 where c1 in (select a.c2 from t1 a where a.c3 = t1.c3)
order by c3 desc limit 1;
affected rows: 1
select * from t1;
c1	c2	c3
1	1	1
1	2	2
1	3	3
11	1	11
11	2	12
11	3	13
12	1	14
12	2	15
12	3	16
12	4	17
12	5	18
2	1	4
2	3	6
2	4	7
2	5	8
21	2	21
21	3	22
21	4	23
22	2	24
22	3	25
22	4	26
22	5	27
22	6	28
31	2	31
31	3	32
31	4	33
32	2	34
32	3	35
32	4	36
32	5	37
32	6	38
insert into t1(c1,c2,c3) select c1,c2,c3 from tmp;
drop table tmp;
#
# Delete: 2 execution of PS
#
prepare create_tmp_stmt from
"create table tmp as select * from t1
      where c2=(select a.c3 from t1 a where a.c3 = ?)";
prepare delete_t1_stmt from
"delete from t1 where c2=(select a.c3 from t1 a where a.c3 = ?)";
set @a:=5;
execute create_tmp_stmt using @a;
execute delete_t1_stmt using @a;
execute delete_t1_stmt using @a;
select * from t1;
c1	c2	c3
1	1	1
1	2	2
1	3	3
11	1	11
11	2	12
11	3	13
12	1	14
12	2	15
12	3	16
12	4	17
2	1	4
2	2	5
2	3	6
2	4	7
21	2	21
21	3	22
21	4	23
22	2	24
22	3	25
22	4	26
22	6	28
31	2	31
31	3	32
31	4	33
32	2	34
32	3	35
32	4	36
32	6	38
prepare insert_tmp_stmt from
"insert into tmp(c1,c2,c3) select * from t1
      where c2=(select a.c3 from t1 a where a.c3 = ?)";
set @a:=2;
execute insert_tmp_stmt using @a;
execute delete_t1_stmt using @a;
select * from t1;
c1	c2	c3
1	1	1
1	3	3
11	1	11
11	3	13
12	1	14
12	3	16
12	4	17
2	1	4
2	3	6
2	4	7
21	3	22
21	4	23
22	3	25
22	4	26
22	6	28
31	3	32
31	4	33
32	3	35
32	4	36
32	6	38
insert into t1(c1,c2,c3) select c1,c2,c3 from tmp;
select * from t1;
c1	c2	c3
1	1	1
1	2	2
1	3	3
11	1	11
11	2	12
11	3	13
12	1	14
12	2	15
12	3	16
12	4	17
12	5	18
2	1	4
2	2	5
2	3	6
2	4	7
2	5	8
21	2	21
21	3	22
21	4	23
22	2	24
22	3	25
22	4	26
22	5	27
22	6	28
31	2	31
31	3	32
31	4	33
32	2	34
32	3	35
32	4	36
32	5	37
32	6	38
drop table tmp;
#
# Delete in stored procedure
#
create procedure sp()
begin
delete from t1 where c1 in (select a.c2 from t1 a where a.c3 = t1.c3)
order by c3 desc limit 1;
end
//
create table tmp as select * from t1
where c1 in (select a.c2 from t1 a where a.c3 = t1.c3)
order by c3 desc limit 1;
CALL sp;
insert into tmp(c1,c2,c3) select * from t1
where c1 in (select a.c2 from t1 a where a.c3 = t1.c3)
order by c3 desc limit 1;
CALL sp;
insert into tmp(c1,c2,c3) select * from t1
where c1 in (select a.c2 from t1 a where a.c3 = t1.c3)
order by c3 desc limit 1;
CALL sp;
select * from t1;
c1	c2	c3
1	2	2
1	3	3
11	1	11
11	2	12
11	3	13
12	1	14
12	2	15
12	3	16
12	4	17
12	5	18
2	1	4
2	3	6
2	4	7
2	5	8
21	2	21
21	3	22
21	4	23
22	2	24
22	3	25
22	4	26
22	5	27
22	6	28
31	2	31
31	3	32
31	4	33
32	2	34
32	3	35
32	4	36
32	5	37
32	6	38
insert into t1(c1,c2,c3) select c1,c2,c3 from tmp;
drop procedure sp;
drop table tmp;
#
# Delete in stored function
#
create function f1(IN a INT) returns int
begin
delete from t1 where c3 < a  order by c3 limit 1;
return  1;
end;//
set @a:=7;
create table tmp as select * from t1 where c3 < @a
order by c3 limit 1;
select f1(@a);
f1(@a)
1
insert into tmp(c1,c2,c3) select * from t1 where c3 < @a
order by c3 limit 1;
select f1(@a);
f1(@a)
1
select * from t1;
c1	c2	c3
1	3	3
11	1	11
11	2	12
11	3	13
12	1	14
12	2	15
12	3	16
12	4	17
12	5	18
2	1	4
2	2	5
2	3	6
2	4	7
2	5	8
21	2	21
21	3	22
21	4	23
22	2	24
22	3	25
22	4	26
22	5	27
22	6	28
31	2	31
31	3	32
31	4	33
32	2	34
32	3	35
32	4	36
32	5	37
32	6	38
insert into t1(c1,c2,c3) select c1,c2,c3 from tmp;
drop function f1;
drop table tmp;
#
# Delete in trigger
#
create table t2 (c1 integer);
insert into t2(c1) values (1), (2), (3), (4), (5), (6), (7), (8);
CREATE TABLE cnt(del integer);
INSERT INTO cnt VALUES(0);
CREATE TRIGGER tr1 AFTER DELETE ON t1 FOR EACH ROW
UPDATE cnt SET del=del+1;
CREATE TRIGGER tr2 AFTER DELETE ON t1 FOR EACH ROW
DELETE FROM t2 WHERE c1> (SELECT count(*)-1 FROM t2);
CREATE TABLE tmp as SELECT * FROM t1 WHERE c2>=3;
DELETE FROM t1 WHERE c2>=3;
affected rows: 20
select * from t1;
c1	c2	c3
1	1	1
1	2	2
11	1	11
11	2	12
12	1	14
12	2	15
2	1	4
2	2	5
21	2	21
22	2	24
31	2	31
32	2	34
SELECT * FROM t2;
c1
SELECT * FROM cnt;
del
20
insert into t1(c1,c2,c3) select c1,c2,c3 from tmp;
DROP TRIGGER tr1;
DROP TRIGGER tr2;
drop table t2, cnt, tmp;
#
# Delete with a reference to view in subquery
#
create table tmp as select * from t1 where t1.c2 in ( select max(a.c2) from v1 a
where a.c1 = t1.c1);
explain select * from t1 where t1.c2 in ( select max(a.c2) from v1 a
where a.c1 = t1.c1);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	32	Using where
2	DEPENDENT SUBQUERY	t1	ALL	NULL	NULL	NULL	NULL	32	Using where
explain delete from t1 where t1.c2 in ( select max(a.c2) from v1 a
where a.c1 = t1.c1);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	32	Using where
2	DEPENDENT SUBQUERY	t1	ALL	NULL	NULL	NULL	NULL	32	Using where
analyze delete from t1 where t1.c2 in ( select max(a.c2) from v1 a
where a.c1 = t1.c1);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	r_rows	filtered	r_filtered	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	32	32.00	100.00	25.00	Using where
2	DEPENDENT SUBQUERY	t1	ALL	NULL	NULL	NULL	NULL	32	32.00	25.00	3.12	Using where
select * from t1;
c1	c2	c3
1	1	1
1	3	3
11	1	11
11	3	13
12	1	14
12	3	16
12	4	17
12	5	18
2	1	4
2	3	6
2	4	7
2	5	8
21	3	22
21	4	23
22	3	25
22	4	26
22	5	27
22	6	28
31	3	32
31	4	33
32	3	35
32	4	36
32	5	37
32	6	38
insert into t1(c1,c2,c3) select c1,c2,c3 from tmp;
drop table tmp;
#
# Delete with EXISTS subquery over the updated table
# in WHERE + non-sargable condition
#
analyze table t1 persistent for all;
Table	Op	Msg_type	Msg_text
test.t1	analyze	status	Engine-independent statistics collected
test.t1	analyze	status	OK
create table tmp as select * from t1 where exists (select 'X' from t1 a where a.c2 = t1.c2) and c2 = 3;
explain select * from t1 where exists (select 'X' from t1 a where a.c2 = t1.c2) and c2 = 3;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	32	Using where
1	PRIMARY	a	ALL	NULL	NULL	NULL	NULL	32	Using where; FirstMatch(t1); Using join buffer (flat, BNL join)
explain delete from t1 where exists (select 'X' from t1 a where a.c2 = t1.c2) and c2 = 3;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	32	Using where
1	PRIMARY	a	ALL	NULL	NULL	NULL	NULL	32	Using where; FirstMatch(t1)
delete from t1 where exists (select 'X' from t1 a where a.c2 = t1.c2) and c2 = 3;
affected rows: 8
select * from t1;
c1	c2	c3
1	1	1
1	2	2
11	1	11
11	2	12
12	1	14
12	2	15
12	4	17
12	5	18
2	1	4
2	2	5
2	4	7
2	5	8
21	2	21
21	4	23
22	2	24
22	4	26
22	5	27
22	6	28
31	2	31
31	4	33
32	2	34
32	4	36
32	5	37
32	6	38
insert into t1(c1,c2,c3) select c1,c2,c3 from tmp;
drop table tmp;
#
# Delete with order by
#
analyze table t1 persistent for all;
Table	Op	Msg_type	Msg_text
test.t1	analyze	status	Engine-independent statistics collected
test.t1	analyze	status	OK
create table tmp as select * from t1 where exists (select 'X' from t1 a where a.c2 = t1.c2)
and c2 >= 3 order by c2;
explain select * from t1 where exists (select 'X' from t1 a where a.c2 = t1.c2)
and c2 >= 3 order by c2;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	#	Using where; Using filesort
1	PRIMARY	<subquery2>	eq_ref	distinct_key	distinct_key	4	func	#	
2	MATERIALIZED	a	ALL	NULL	NULL	NULL	NULL	#	
explain delete from t1 where exists (select 'X' from t1 a where a.c2 = t1.c2)
and c2 >= 3 order by c2;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	#	Using where
1	PRIMARY	<subquery2>	eq_ref	distinct_key	distinct_key	4	func	#	
2	MATERIALIZED	a	ALL	NULL	NULL	NULL	NULL	#	
analyze delete from t1 where exists (select 'X' from t1 a where a.c2 = t1.c2)
and c2 >= 3 order by c2;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	r_rows	filtered	r_filtered	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	#	32.00	62.50	62.50	Using where
1	PRIMARY	<subquery2>	eq_ref	distinct_key	distinct_key	4	func	#	1.00	100.00	100.00	
2	MATERIALIZED	a	ALL	NULL	NULL	NULL	NULL	#	32.00	62.50	100.00	
select * from t1;
c1	c2	c3
1	1	1
1	2	2
11	1	11
11	2	12
12	1	14
12	2	15
2	1	4
2	2	5
21	2	21
22	2	24
31	2	31
32	2	34
insert into t1(c1,c2,c3) select c1,c2,c3 from tmp;
drop table tmp;
#
# Delete from view
#
analyze table t1 persistent for all;
Table	Op	Msg_type	Msg_text
test.t1	analyze	status	Engine-independent statistics collected
test.t1	analyze	status	OK
create table tmp as select * from v1 where v1.c1 in
(select max(a.c1) from t1 a where a.c2 = v1.c2) and c3 = 5;
explain select * from v1 where v1.c1 in
(select max(a.c1) from t1 a where a.c2 = v1.c2) and c3 = 5;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	32	Using where
2	DEPENDENT SUBQUERY	a	ALL	NULL	NULL	NULL	NULL	32	Using where
explain delete from v1 where v1.c1 in
(select max(a.c1) from t1 a where a.c2 = v1.c2) and c3 = 5;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	32	Using where
2	DEPENDENT SUBQUERY	a	ALL	NULL	NULL	NULL	NULL	32	Using where
delete from v1 where v1.c1 in
(select max(a.c1) from t1 a where a.c2 = v1.c2) and c3 = 5;
affected rows: 0
select * from t1;
c1	c2	c3
1	1	1
1	2	2
1	3	3
11	1	11
11	2	12
11	3	13
12	1	14
12	2	15
12	3	16
12	4	17
12	5	18
2	1	4
2	2	5
2	3	6
2	4	7
2	5	8
21	2	21
21	3	22
21	4	23
22	2	24
22	3	25
22	4	26
22	5	27
22	6	28
31	2	31
31	3	32
31	4	33
32	2	34
32	3	35
32	4	36
32	5	37
32	6	38
insert into t1(c1,c2,c3) select c1,c2,c3 from tmp;
drop table tmp;
#
# Delete from view using reference
# to the same view in subquery
#
analyze table t1 persistent for all;
Table	Op	Msg_type	Msg_text
test.t1	analyze	status	Engine-independent statistics collected
test.t1	analyze	status	Table is already up to date
create table tmp as select * from v1 where v1.c2 in (select max(a.c2) from t1 a where a.c3 = v1.c3)
and c1 = 2
and exists (select 'X' from v1 a where a.c1 = v1.c1);
explain select * from v1 where v1.c2 in (select max(a.c2) from t1 a where a.c3 = v1.c3)
and c1 = 2
and exists (select 'X' from v1 a where a.c1 = v1.c1);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	#	Using where
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	#	Using where; FirstMatch(t1); Using join buffer (flat, BNL join)
2	DEPENDENT SUBQUERY	a	ALL	NULL	NULL	NULL	NULL	#	Using where
explain delete from v1 where v1.c2 in (select max(a.c2) from t1 a where a.c3 = v1.c3)
and c1 = 2
and exists (select 'X' from v1 a where a.c1 = v1.c1);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	#	Using where
3	DEPENDENT SUBQUERY	t1	ALL	NULL	NULL	NULL	NULL	#	Using where
2	DEPENDENT SUBQUERY	a	ALL	NULL	NULL	NULL	NULL	#	Using where
analyze delete from v1 where v1.c2 in (select max(a.c2) from t1 a where a.c3 = v1.c3)
and c1 = 2
and exists (select 'X' from v1 a where a.c1 = v1.c1);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	r_rows	filtered	r_filtered	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	#	32.00	3.91	3.12	Using where
3	DEPENDENT SUBQUERY	t1	ALL	NULL	NULL	NULL	NULL	#	5.00	25.00	20.00	Using where
2	DEPENDENT SUBQUERY	a	ALL	NULL	NULL	NULL	NULL	#	32.00	100.00	3.12	Using where
select * from t1;
c1	c2	c3
1	1	1
1	2	2
1	3	3
11	1	11
11	2	12
11	3	13
12	1	14
12	2	15
12	3	16
12	4	17
12	5	18
2	1	4
2	3	6
2	4	7
2	5	8
21	2	21
21	3	22
21	4	23
22	2	24
22	3	25
22	4	26
22	5	27
22	6	28
31	2	31
31	3	32
31	4	33
32	2	34
32	3	35
32	4	36
32	5	37
32	6	38
insert into t1(c1,c2,c3) select c1,c2,c3 from tmp;
drop table tmp;
#######################################
#          Test with an index         #
#######################################
create index t1_c2 on t1 (c2,c1);
#
# Delete with value from subquery on the same table
#
analyze table t1 persistent for all;
Table	Op	Msg_type	Msg_text
test.t1	analyze	status	Engine-independent statistics collected
test.t1	analyze	status	OK
create table tmp as select * from t1 where c1=(select a.c3 from t1 a where a.c3 = t1.c3);
explain select * from t1 where c1=(select a.c3 from t1 a where a.c3 = t1.c3);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	32	Using where
2	DEPENDENT SUBQUERY	a	ALL	NULL	NULL	NULL	NULL	32	Using where
explain delete from t1 where c1=(select a.c3 from t1 a where a.c3 = t1.c3);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	32	Using where
2	DEPENDENT SUBQUERY	a	ALL	NULL	NULL	NULL	NULL	32	Using where
delete from t1 where c1=(select a.c3 from t1 a where a.c3 = t1.c3);
affected rows: 4
select * from t1;
c1	c2	c3
1	2	2
1	3	3
11	2	12
11	3	13
12	1	14
12	2	15
12	3	16
12	4	17
12	5	18
2	1	4
2	2	5
2	3	6
2	4	7
2	5	8
21	3	22
21	4	23
22	2	24
22	3	25
22	4	26
22	5	27
22	6	28
31	3	32
31	4	33
32	2	34
32	3	35
32	4	36
32	5	37
32	6	38
insert into t1(c1,c2,c3) select c1,c2,c3 from tmp;
drop table tmp;
#
# Delete with EXISTS subquery over the updated table
# in WHERE + possibly sargable condition
#
analyze table t1 persistent for all;
Table	Op	Msg_type	Msg_text
test.t1	analyze	status	Engine-independent statistics collected
test.t1	analyze	status	OK
create table tmp as select * from t1 where c1 = 1 and exists (select 'X' from t1 a where a.c1 = t1.c2);
explain select * from t1 where c1 = 1 and exists (select 'X' from t1 a where a.c1 = t1.c2);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	t1_c2	NULL	NULL	NULL	32	Using where
1	PRIMARY	a	index	NULL	t1_c2	10	NULL	32	Using where; Using index; FirstMatch(t1); Using join buffer (flat, BNL join)
explain delete from t1 where c1 = 1 and exists (select 'X' from t1 a where a.c1 = t1.c2);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	t1_c2	NULL	NULL	NULL	32	Using where
1	PRIMARY	a	index	NULL	t1_c2	10	NULL	32	Using where; Using index; FirstMatch(t1)
analyze delete from t1 where c1 = 1 and exists (select 'X' from t1 a where a.c1 = t1.c2);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	r_rows	filtered	r_filtered	Extra
1	PRIMARY	t1	ALL	t1_c2	NULL	NULL	NULL	32	32.00	9.38	9.38	Using where
1	PRIMARY	a	index	NULL	t1_c2	10	NULL	32	11.67	3.12	5.71	Using where; Using index; FirstMatch(t1)
select * from t1;
c1	c2	c3
1	3	3
11	1	11
11	2	12
11	3	13
12	1	14
12	2	15
12	3	16
12	4	17
12	5	18
2	1	4
2	2	5
2	3	6
2	4	7
2	5	8
21	2	21
21	3	22
21	4	23
22	2	24
22	3	25
22	4	26
22	5	27
22	6	28
31	2	31
31	3	32
31	4	33
32	2	34
32	3	35
32	4	36
32	5	37
32	6	38
insert into t1(c1,c2,c3) select c1,c2,c3 from tmp;
drop table tmp;
#
# Delete with IN predicand over the updated table in WHERE
#
create table tmp as select * from t1 where c3 in (select distinct a.c1 from t1 a where t1.c2=a.c2);
explain select * from t1 where c3 in (select distinct a.c1 from t1 a where t1.c2=a.c2);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	t1_c2	NULL	NULL	NULL	32	Using where
1	PRIMARY	a	ref	t1_c2	t1_c2	10	test.t1.c2,test.t1.c3	1	Using index; FirstMatch(t1)
explain delete from t1 where c3 in (select distinct a.c1 from t1 a where t1.c2=a.c2);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	t1_c2	NULL	NULL	NULL	32	Using where
1	PRIMARY	a	ref	t1_c2	t1_c2	10	test.t1.c2,test.t1.c3	1	Using index; FirstMatch(t1)
delete from t1 where c3 in (select distinct a.c1 from t1 a where t1.c2=a.c2);
affected rows: 8
select * from t1;
c1	c2	c3
1	3	3
11	3	13
12	1	14
12	2	15
12	3	16
12	4	17
12	5	18
2	1	4
2	2	5
2	3	6
2	4	7
2	5	8
21	4	23
22	2	24
22	3	25
22	4	26
22	5	27
22	6	28
31	4	33
32	2	34
32	3	35
32	4	36
32	5	37
32	6	38
insert into t1(c1,c2,c3) select c1,c2,c3 from tmp;
drop table tmp;
#
# Delete with a limit - can be deleted
#
create table tmp as select * from t1 where c1 in (select a.c2 from t1 a where a.c2 = t1.c3) limit 1;
explain select * from t1 where c1 in (select a.c2 from t1 a where a.c2 = t1.c3) limit 1;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	32	Using where
1	PRIMARY	a	ref	t1_c2	t1_c2	5	test.t1.c1	5	Using index; FirstMatch(t1)
explain delete from t1 where c1 in (select a.c2 from t1 a where a.c2 = t1.c3) limit 1;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	32	Using where
1	PRIMARY	a	ref	t1_c2	t1_c2	5	test.t1.c1	5	Using index; FirstMatch(t1)
analyze delete from t1 where c1 in (select a.c2 from t1 a where a.c2 = t1.c3) limit 1;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	r_rows	filtered	r_filtered	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	32	27.00	100.00	14.81	Using where
1	PRIMARY	a	ref	t1_c2	t1_c2	5	test.t1.c1	5	0.25	18.75	100.00	Using index; FirstMatch(t1)
select * from t1;
c1	c2	c3
1	2	2
1	3	3
11	1	11
11	2	12
11	3	13
12	1	14
12	2	15
12	3	16
12	4	17
12	5	18
2	1	4
2	2	5
2	3	6
2	4	7
2	5	8
21	2	21
21	3	22
21	4	23
22	2	24
22	3	25
22	4	26
22	5	27
22	6	28
31	2	31
31	3	32
31	4	33
32	2	34
32	3	35
32	4	36
32	5	37
32	6	38
insert into t1(c1,c2,c3) select c1,c2,c3 from tmp;
drop table tmp;
#
# Delete with a limit and an order by
#
create table tmp as select * from t1 where c1 in (select a.c2 from t1 a where a.c3 = t1.c3)
order by c3 desc limit 1;
explain select * from t1 where c1 in (select a.c2 from t1 a where a.c3 = t1.c3)
order by c3 desc limit 1;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	32	Using where; Using filesort
1	PRIMARY	a	ref	t1_c2	t1_c2	5	test.t1.c1	5	Using where; FirstMatch(t1)
explain delete from t1 where c1 in (select a.c2 from t1 a where a.c3 = t1.c3)
order by c3 desc limit 1;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	32	Using where; Using filesort
2	DEPENDENT SUBQUERY	a	index_subquery	t1_c2	t1_c2	5	func	5	Using where
delete from t1 where c1 in (select a.c2 from t1 a where a.c3 = t1.c3)
order by c3 desc limit 1;
affected rows: 1
select * from t1;
c1	c2	c3
1	1	1
1	2	2
1	3	3
11	1	11
11	2	12
11	3	13
12	1	14
12	2	15
12	3	16
12	4	17
12	5	18
2	1	4
2	3	6
2	4	7
2	5	8
21	2	21
21	3	22
21	4	23
22	2	24
22	3	25
22	4	26
22	5	27
22	6	28
31	2	31
31	3	32
31	4	33
32	2	34
32	3	35
32	4	36
32	5	37
32	6	38
insert into t1(c1,c2,c3) select c1,c2,c3 from tmp;
drop table tmp;
#
# Delete: 2 execution of PS
#
prepare create_tmp_stmt from
"create table tmp as select * from t1
      where c2=(select a.c3 from t1 a where a.c3 = ?)";
prepare delete_t1_stmt from
"delete from t1 where c2=(select a.c3 from t1 a where a.c3 = ?)";
set @a:=5;
execute create_tmp_stmt using @a;
execute delete_t1_stmt using @a;
execute delete_t1_stmt using @a;
select * from t1;
c1	c2	c3
1	1	1
1	2	2
1	3	3
11	1	11
11	2	12
11	3	13
12	1	14
12	2	15
12	3	16
12	4	17
2	1	4
2	2	5
2	3	6
2	4	7
21	2	21
21	3	22
21	4	23
22	2	24
22	3	25
22	4	26
22	6	28
31	2	31
31	3	32
31	4	33
32	2	34
32	3	35
32	4	36
32	6	38
prepare insert_tmp_stmt from
"insert into tmp(c1,c2,c3) select * from t1
      where c2=(select a.c3 from t1 a where a.c3 = ?)";
set @a:=2;
execute insert_tmp_stmt using @a;
execute delete_t1_stmt using @a;
select * from t1;
c1	c2	c3
1	1	1
1	3	3
11	1	11
11	3	13
12	1	14
12	3	16
12	4	17
2	1	4
2	3	6
2	4	7
21	3	22
21	4	23
22	3	25
22	4	26
22	6	28
31	3	32
31	4	33
32	3	35
32	4	36
32	6	38
insert into t1(c1,c2,c3) select c1,c2,c3 from tmp;
select * from t1;
c1	c2	c3
1	1	1
1	2	2
1	3	3
11	1	11
11	2	12
11	3	13
12	1	14
12	2	15
12	3	16
12	4	17
12	5	18
2	1	4
2	2	5
2	3	6
2	4	7
2	5	8
21	2	21
21	3	22
21	4	23
22	2	24
22	3	25
22	4	26
22	5	27
22	6	28
31	2	31
31	3	32
31	4	33
32	2	34
32	3	35
32	4	36
32	5	37
32	6	38
drop table tmp;
#
# Delete in stored procedure
#
create procedure sp()
begin
delete from t1 where c1 in (select a.c2 from t1 a where a.c3 = t1.c3)
order by c3 desc limit 1;
end
//
create table tmp as select * from t1
where c1 in (select a.c2 from t1 a where a.c3 = t1.c3)
order by c3 desc limit 1;
CALL sp;
insert into tmp(c1,c2,c3) select * from t1
where c1 in (select a.c2 from t1 a where a.c3 = t1.c3)
order by c3 desc limit 1;
CALL sp;
insert into tmp(c1,c2,c3) select * from t1
where c1 in (select a.c2 from t1 a where a.c3 = t1.c3)
order by c3 desc limit 1;
CALL sp;
select * from t1;
c1	c2	c3
1	2	2
1	3	3
11	1	11
11	2	12
11	3	13
12	1	14
12	2	15
12	3	16
12	4	17
12	5	18
2	1	4
2	3	6
2	4	7
2	5	8
21	2	21
21	3	22
21	4	23
22	2	24
22	3	25
22	4	26
22	5	27
22	6	28
31	2	31
31	3	32
31	4	33
32	2	34
32	3	35
32	4	36
32	5	37
32	6	38
insert into t1(c1,c2,c3) select c1,c2,c3 from tmp;
drop procedure sp;
drop table tmp;
#
# Delete in stored function
#
create function f1(IN a INT) returns int
begin
delete from t1 where c3 < a  order by c3 limit 1;
return  1;
end;//
set @a:=7;
create table tmp as select * from t1 where c3 < @a
order by c3 limit 1;
select f1(@a);
f1(@a)
1
insert into tmp(c1,c2,c3) select * from t1 where c3 < @a
order by c3 limit 1;
select f1(@a);
f1(@a)
1
select * from t1;
c1	c2	c3
1	3	3
11	1	11
11	2	12
11	3	13
12	1	14
12	2	15
12	3	16
12	4	17
12	5	18
2	1	4
2	2	5
2	3	6
2	4	7
2	5	8
21	2	21
21	3	22
21	4	23
22	2	24
22	3	25
22	4	26
22	5	27
22	6	28
31	2	31
31	3	32
31	4	33
32	2	34
32	3	35
32	4	36
32	5	37
32	6	38
insert into t1(c1,c2,c3) select c1,c2,c3 from tmp;
drop function f1;
drop table tmp;
#
# Delete in trigger
#
create table t2 (c1 integer);
insert into t2(c1) values (1), (2), (3), (4), (5), (6), (7), (8);
CREATE TABLE cnt(del integer);
INSERT INTO cnt VALUES(0);
CREATE TRIGGER tr1 AFTER DELETE ON t1 FOR EACH ROW
UPDATE cnt SET del=del+1;
CREATE TRIGGER tr2 AFTER DELETE ON t1 FOR EACH ROW
DELETE FROM t2 WHERE c1> (SELECT count(*)-1 FROM t2);
CREATE TABLE tmp as SELECT * FROM t1 WHERE c2>=3;
DELETE FROM t1 WHERE c2>=3;
affected rows: 20
select * from t1;
c1	c2	c3
1	1	1
1	2	2
11	1	11
11	2	12
12	1	14
12	2	15
2	1	4
2	2	5
21	2	21
22	2	24
31	2	31
32	2	34
SELECT * FROM t2;
c1
SELECT * FROM cnt;
del
20
insert into t1(c1,c2,c3) select c1,c2,c3 from tmp;
DROP TRIGGER tr1;
DROP TRIGGER tr2;
drop table t2, cnt, tmp;
#
# Delete with a reference to view in subquery
#
create table tmp as select * from t1 where t1.c2 in ( select max(a.c2) from v1 a
where a.c1 = t1.c1);
explain select * from t1 where t1.c2 in ( select max(a.c2) from v1 a
where a.c1 = t1.c1);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	32	Using where
2	DEPENDENT SUBQUERY	t1	ref	t1_c2	t1_c2	10	const,test.t1.c1	1	Using index
explain delete from t1 where t1.c2 in ( select max(a.c2) from v1 a
where a.c1 = t1.c1);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	32	Using where
2	DEPENDENT SUBQUERY	t1	ref	t1_c2	t1_c2	10	const,test.t1.c1	1	Using index
analyze delete from t1 where t1.c2 in ( select max(a.c2) from v1 a
where a.c1 = t1.c1);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	r_rows	filtered	r_filtered	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	32	32.00	100.00	25.00	Using where
2	DEPENDENT SUBQUERY	t1	ref	t1_c2	t1_c2	10	const,test.t1.c1	1	1.00	100.00	100.00	Using index
select * from t1;
c1	c2	c3
1	1	1
1	3	3
11	1	11
11	3	13
12	1	14
12	3	16
12	4	17
12	5	18
2	1	4
2	3	6
2	4	7
2	5	8
21	3	22
21	4	23
22	3	25
22	4	26
22	5	27
22	6	28
31	3	32
31	4	33
32	3	35
32	4	36
32	5	37
32	6	38
insert into t1(c1,c2,c3) select c1,c2,c3 from tmp;
drop table tmp;
#
# Delete with EXISTS subquery over the updated table
# in WHERE + non-sargable condition
#
analyze table t1 persistent for all;
Table	Op	Msg_type	Msg_text
test.t1	analyze	status	Engine-independent statistics collected
test.t1	analyze	status	OK
create table tmp as select * from t1 where exists (select 'X' from t1 a where a.c2 = t1.c2) and c2 = 3;
explain select * from t1 where exists (select 'X' from t1 a where a.c2 = t1.c2) and c2 = 3;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ref	t1_c2	t1_c2	5	const	8	
1	PRIMARY	a	ref	t1_c2	t1_c2	5	const	8	Using index; FirstMatch(t1)
explain delete from t1 where exists (select 'X' from t1 a where a.c2 = t1.c2) and c2 = 3;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ref	t1_c2	t1_c2	5	const	8	
1	PRIMARY	a	ref	t1_c2	t1_c2	5	const	8	Using index; FirstMatch(t1)
delete from t1 where exists (select 'X' from t1 a where a.c2 = t1.c2) and c2 = 3;
affected rows: 8
select * from t1;
c1	c2	c3
1	1	1
1	2	2
11	1	11
11	2	12
12	1	14
12	2	15
12	4	17
12	5	18
2	1	4
2	2	5
2	4	7
2	5	8
21	2	21
21	4	23
22	2	24
22	4	26
22	5	27
22	6	28
31	2	31
31	4	33
32	2	34
32	4	36
32	5	37
32	6	38
insert into t1(c1,c2,c3) select c1,c2,c3 from tmp;
drop table tmp;
#
# Delete with order by
#
analyze table t1 persistent for all;
Table	Op	Msg_type	Msg_text
test.t1	analyze	status	Engine-independent statistics collected
test.t1	analyze	status	OK
create table tmp as select * from t1 where exists (select 'X' from t1 a where a.c2 = t1.c2)
and c2 >= 3 order by c2;
explain select * from t1 where exists (select 'X' from t1 a where a.c2 = t1.c2)
and c2 >= 3 order by c2;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	range	t1_c2	t1_c2	5	NULL	#	Using index condition
1	PRIMARY	a	ref	t1_c2	t1_c2	5	test.t1.c2	#	Using index; FirstMatch(t1)
explain delete from t1 where exists (select 'X' from t1 a where a.c2 = t1.c2)
and c2 >= 3 order by c2;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	a	index	t1_c2	t1_c2	10	NULL	#	Using where; Using index; LooseScan
1	PRIMARY	t1	ref	t1_c2	t1_c2	5	test.a.c2	#	
analyze delete from t1 where exists (select 'X' from t1 a where a.c2 = t1.c2)
and c2 >= 3 order by c2;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	r_rows	filtered	r_filtered	Extra
1	PRIMARY	a	index	t1_c2	t1_c2	10	NULL	#	16.00	20.00	25.00	Using where; Using index; LooseScan
1	PRIMARY	t1	ref	t1_c2	t1_c2	5	test.a.c2	#	5.00	4.76	100.00	
select * from t1;
c1	c2	c3
1	1	1
1	2	2
11	1	11
11	2	12
12	1	14
12	2	15
2	1	4
2	2	5
21	2	21
22	2	24
31	2	31
32	2	34
insert into t1(c1,c2,c3) select c1,c2,c3 from tmp;
drop table tmp;
#
# Delete from view
#
analyze table t1 persistent for all;
Table	Op	Msg_type	Msg_text
test.t1	analyze	status	Engine-independent statistics collected
test.t1	analyze	status	OK
create table tmp as select * from v1 where v1.c1 in
(select max(a.c1) from t1 a where a.c2 = v1.c2) and c3 = 5;
explain select * from v1 where v1.c1 in
(select max(a.c1) from t1 a where a.c2 = v1.c2) and c3 = 5;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ref	t1_c2	t1_c2	5	const	8	Using where
2	DEPENDENT SUBQUERY	a	ref	t1_c2	t1_c2	5	test.t1.c2	5	Using index
explain delete from v1 where v1.c1 in
(select max(a.c1) from t1 a where a.c2 = v1.c2) and c3 = 5;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ref	t1_c2	t1_c2	5	const	8	Using where
2	DEPENDENT SUBQUERY	a	ref	t1_c2	t1_c2	5	test.t1.c2	5	Using index
delete from v1 where v1.c1 in
(select max(a.c1) from t1 a where a.c2 = v1.c2) and c3 = 5;
affected rows: 0
select * from t1;
c1	c2	c3
1	1	1
1	2	2
1	3	3
11	1	11
11	2	12
11	3	13
12	1	14
12	2	15
12	3	16
12	4	17
12	5	18
2	1	4
2	2	5
2	3	6
2	4	7
2	5	8
21	2	21
21	3	22
21	4	23
22	2	24
22	3	25
22	4	26
22	5	27
22	6	28
31	2	31
31	3	32
31	4	33
32	2	34
32	3	35
32	4	36
32	5	37
32	6	38
insert into t1(c1,c2,c3) select c1,c2,c3 from tmp;
drop table tmp;
#
# Delete from view using reference
# to the same view in subquery
#
analyze table t1 persistent for all;
Table	Op	Msg_type	Msg_text
test.t1	analyze	status	Engine-independent statistics collected
test.t1	analyze	status	Table is already up to date
create table tmp as select * from v1 where v1.c2 in (select max(a.c2) from t1 a where a.c3 = v1.c3)
and c1 = 2
and exists (select 'X' from v1 a where a.c1 = v1.c1);
explain select * from v1 where v1.c2 in (select max(a.c2) from t1 a where a.c3 = v1.c3)
and c1 = 2
and exists (select 'X' from v1 a where a.c1 = v1.c1);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ref	t1_c2	t1_c2	10	const,const	#	Using where
1	PRIMARY	t1	ref	t1_c2	t1_c2	10	const,const	#	Using index; FirstMatch(t1)
2	DEPENDENT SUBQUERY	a	ALL	NULL	NULL	NULL	NULL	#	Using where
explain delete from v1 where v1.c2 in (select max(a.c2) from t1 a where a.c3 = v1.c3)
and c1 = 2
and exists (select 'X' from v1 a where a.c1 = v1.c1);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ref	t1_c2	t1_c2	10	const,const	#	Using where
3	DEPENDENT SUBQUERY	t1	ref	t1_c2	t1_c2	10	const,func	#	Using where; Using index
2	DEPENDENT SUBQUERY	a	ALL	NULL	NULL	NULL	NULL	#	Using where
analyze delete from v1 where v1.c2 in (select max(a.c2) from t1 a where a.c3 = v1.c3)
and c1 = 2
and exists (select 'X' from v1 a where a.c1 = v1.c1);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	r_rows	filtered	r_filtered	Extra
1	PRIMARY	t1	ref	t1_c2	t1_c2	10	const,const	#	1.00	100.00	100.00	Using where
3	DEPENDENT SUBQUERY	t1	ref	t1_c2	t1_c2	10	const,func	#	1.00	100.00	100.00	Using where; Using index
2	DEPENDENT SUBQUERY	a	ALL	NULL	NULL	NULL	NULL	#	32.00	100.00	3.12	Using where
select * from t1;
c1	c2	c3
1	1	1
1	2	2
1	3	3
11	1	11
11	2	12
11	3	13
12	1	14
12	2	15
12	3	16
12	4	17
12	5	18
2	1	4
2	3	6
2	4	7
2	5	8
21	2	21
21	3	22
21	4	23
22	2	24
22	3	25
22	4	26
22	5	27
22	6	28
31	2	31
31	3	32
31	4	33
32	2	34
32	3	35
32	4	36
32	5	37
32	6	38
insert into t1(c1,c2,c3) select c1,c2,c3 from tmp;
drop table tmp;
#######################################
#       Test with a primary key       #
#######################################
drop index t1_c2 on t1;
alter table t1 add primary key (c3);
#
# Delete with value from subquery on the same table
#
analyze table t1 persistent for all;
Table	Op	Msg_type	Msg_text
test.t1	analyze	status	Engine-independent statistics collected
test.t1	analyze	status	OK
create table tmp as select * from t1 where c1=(select a.c3 from t1 a where a.c3 = t1.c3);
explain select * from t1 where c1=(select a.c3 from t1 a where a.c3 = t1.c3);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	32	Using where
2	DEPENDENT SUBQUERY	a	eq_ref	PRIMARY	PRIMARY	4	test.t1.c3	1	Using index
explain delete from t1 where c1=(select a.c3 from t1 a where a.c3 = t1.c3);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	32	Using where
2	DEPENDENT SUBQUERY	a	eq_ref	PRIMARY	PRIMARY	4	test.t1.c3	1	Using index
delete from t1 where c1=(select a.c3 from t1 a where a.c3 = t1.c3);
affected rows: 4
select * from t1;
c1	c2	c3
1	2	2
1	3	3
11	2	12
11	3	13
12	1	14
12	2	15
12	3	16
12	4	17
12	5	18
2	1	4
2	2	5
2	3	6
2	4	7
2	5	8
21	3	22
21	4	23
22	2	24
22	3	25
22	4	26
22	5	27
22	6	28
31	3	32
31	4	33
32	2	34
32	3	35
32	4	36
32	5	37
32	6	38
insert into t1(c1,c2,c3) select c1,c2,c3 from tmp;
drop table tmp;
#
# Delete with EXISTS subquery over the updated table
# in WHERE + possibly sargable condition
#
analyze table t1 persistent for all;
Table	Op	Msg_type	Msg_text
test.t1	analyze	status	Engine-independent statistics collected
test.t1	analyze	status	OK
create table tmp as select * from t1 where c1 = 1 and exists (select 'X' from t1 a where a.c1 = t1.c2);
explain select * from t1 where c1 = 1 and exists (select 'X' from t1 a where a.c1 = t1.c2);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	32	Using where
1	PRIMARY	a	ALL	NULL	NULL	NULL	NULL	32	Using where; FirstMatch(t1); Using join buffer (flat, BNL join)
explain delete from t1 where c1 = 1 and exists (select 'X' from t1 a where a.c1 = t1.c2);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	32	Using where
1	PRIMARY	a	ALL	NULL	NULL	NULL	NULL	32	Using where; FirstMatch(t1)
analyze delete from t1 where c1 = 1 and exists (select 'X' from t1 a where a.c1 = t1.c2);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	r_rows	filtered	r_filtered	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	32	32.00	9.38	9.38	Using where
1	PRIMARY	a	ALL	NULL	NULL	NULL	NULL	32	12.00	3.12	5.56	Using where; FirstMatch(t1)
select * from t1;
c1	c2	c3
1	3	3
11	1	11
11	2	12
11	3	13
12	1	14
12	2	15
12	3	16
12	4	17
12	5	18
2	1	4
2	2	5
2	3	6
2	4	7
2	5	8
21	2	21
21	3	22
21	4	23
22	2	24
22	3	25
22	4	26
22	5	27
22	6	28
31	2	31
31	3	32
31	4	33
32	2	34
32	3	35
32	4	36
32	5	37
32	6	38
insert into t1(c1,c2,c3) select c1,c2,c3 from tmp;
drop table tmp;
#
# Delete with IN predicand over the updated table in WHERE
#
create table tmp as select * from t1 where c3 in (select distinct a.c1 from t1 a where t1.c2=a.c2);
explain select * from t1 where c3 in (select distinct a.c1 from t1 a where t1.c2=a.c2);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	a	ALL	NULL	NULL	NULL	NULL	32	Using where; Start temporary
1	PRIMARY	t1	eq_ref	PRIMARY	PRIMARY	4	test.a.c1	1	Using where; End temporary
explain delete from t1 where c3 in (select distinct a.c1 from t1 a where t1.c2=a.c2);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	a	ALL	NULL	NULL	NULL	NULL	32	Using where; Start temporary
1	PRIMARY	t1	eq_ref	PRIMARY	PRIMARY	4	test.a.c1	1	Using where; End temporary
delete from t1 where c3 in (select distinct a.c1 from t1 a where t1.c2=a.c2);
affected rows: 8
select * from t1;
c1	c2	c3
1	3	3
11	3	13
12	1	14
12	2	15
12	3	16
12	4	17
12	5	18
2	1	4
2	2	5
2	3	6
2	4	7
2	5	8
21	4	23
22	2	24
22	3	25
22	4	26
22	5	27
22	6	28
31	4	33
32	2	34
32	3	35
32	4	36
32	5	37
32	6	38
insert into t1(c1,c2,c3) select c1,c2,c3 from tmp;
drop table tmp;
#
# Delete with a limit - can be deleted
#
create table tmp as select * from t1 where c1 in (select a.c2 from t1 a where a.c2 = t1.c3) limit 1;
explain select * from t1 where c1 in (select a.c2 from t1 a where a.c2 = t1.c3) limit 1;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	a	ALL	NULL	NULL	NULL	NULL	32	Using where; Start temporary
1	PRIMARY	t1	eq_ref	PRIMARY	PRIMARY	4	test.a.c2	1	Using where; End temporary
explain delete from t1 where c1 in (select a.c2 from t1 a where a.c2 = t1.c3) limit 1;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	a	ALL	NULL	NULL	NULL	NULL	32	Using where; Start temporary
1	PRIMARY	t1	eq_ref	PRIMARY	PRIMARY	4	test.a.c2	1	Using where; End temporary
analyze delete from t1 where c1 in (select a.c2 from t1 a where a.c2 = t1.c3) limit 1;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	r_rows	filtered	r_filtered	Extra
1	PRIMARY	a	ALL	NULL	NULL	NULL	NULL	32	4.00	100.00	100.00	Using where; Start temporary
1	PRIMARY	t1	eq_ref	PRIMARY	PRIMARY	4	test.a.c2	1	1.00	3.12	25.00	Using where; End temporary
select * from t1;
c1	c2	c3
1	2	2
1	3	3
11	1	11
11	2	12
11	3	13
12	1	14
12	2	15
12	3	16
12	4	17
12	5	18
2	1	4
2	2	5
2	3	6
2	4	7
2	5	8
21	2	21
21	3	22
21	4	23
22	2	24
22	3	25
22	4	26
22	5	27
22	6	28
31	2	31
31	3	32
31	4	33
32	2	34
32	3	35
32	4	36
32	5	37
32	6	38
insert into t1(c1,c2,c3) select c1,c2,c3 from tmp;
drop table tmp;
#
# Delete with a limit and an order by
#
create table tmp as select * from t1 where c1 in (select a.c2 from t1 a where a.c3 = t1.c3)
order by c3 desc limit 1;
explain select * from t1 where c1 in (select a.c2 from t1 a where a.c3 = t1.c3)
order by c3 desc limit 1;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	index	PRIMARY	PRIMARY	4	NULL	1	
1	PRIMARY	a	eq_ref	PRIMARY	PRIMARY	4	test.t1.c3	1	Using where
explain delete from t1 where c1 in (select a.c2 from t1 a where a.c3 = t1.c3)
order by c3 desc limit 1;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	index	NULL	PRIMARY	4	NULL	1	Using where
2	DEPENDENT SUBQUERY	a	eq_ref	PRIMARY	PRIMARY	4	test.t1.c3	1	Using where
delete from t1 where c1 in (select a.c2 from t1 a where a.c3 = t1.c3)
order by c3 desc limit 1;
affected rows: 1
select * from t1;
c1	c2	c3
1	1	1
1	2	2
1	3	3
11	1	11
11	2	12
11	3	13
12	1	14
12	2	15
12	3	16
12	4	17
12	5	18
2	1	4
2	3	6
2	4	7
2	5	8
21	2	21
21	3	22
21	4	23
22	2	24
22	3	25
22	4	26
22	5	27
22	6	28
31	2	31
31	3	32
31	4	33
32	2	34
32	3	35
32	4	36
32	5	37
32	6	38
insert into t1(c1,c2,c3) select c1,c2,c3 from tmp;
drop table tmp;
#
# Delete: 2 execution of PS
#
prepare create_tmp_stmt from
"create table tmp as select * from t1
      where c2=(select a.c3 from t1 a where a.c3 = ?)";
prepare delete_t1_stmt from
"delete from t1 where c2=(select a.c3 from t1 a where a.c3 = ?)";
set @a:=5;
execute create_tmp_stmt using @a;
execute delete_t1_stmt using @a;
execute delete_t1_stmt using @a;
select * from t1;
c1	c2	c3
1	1	1
1	2	2
1	3	3
11	1	11
11	2	12
11	3	13
12	1	14
12	2	15
12	3	16
12	4	17
2	1	4
2	2	5
2	3	6
2	4	7
21	2	21
21	3	22
21	4	23
22	2	24
22	3	25
22	4	26
22	6	28
31	2	31
31	3	32
31	4	33
32	2	34
32	3	35
32	4	36
32	6	38
prepare insert_tmp_stmt from
"insert into tmp(c1,c2,c3) select * from t1
      where c2=(select a.c3 from t1 a where a.c3 = ?)";
set @a:=2;
execute insert_tmp_stmt using @a;
execute delete_t1_stmt using @a;
select * from t1;
c1	c2	c3
1	1	1
1	3	3
11	1	11
11	3	13
12	1	14
12	3	16
12	4	17
2	1	4
2	3	6
2	4	7
21	3	22
21	4	23
22	3	25
22	4	26
22	6	28
31	3	32
31	4	33
32	3	35
32	4	36
32	6	38
insert into t1(c1,c2,c3) select c1,c2,c3 from tmp;
select * from t1;
c1	c2	c3
1	1	1
1	2	2
1	3	3
11	1	11
11	2	12
11	3	13
12	1	14
12	2	15
12	3	16
12	4	17
12	5	18
2	1	4
2	2	5
2	3	6
2	4	7
2	5	8
21	2	21
21	3	22
21	4	23
22	2	24
22	3	25
22	4	26
22	5	27
22	6	28
31	2	31
31	3	32
31	4	33
32	2	34
32	3	35
32	4	36
32	5	37
32	6	38
drop table tmp;
#
# Delete in stored procedure
#
create procedure sp()
begin
delete from t1 where c1 in (select a.c2 from t1 a where a.c3 = t1.c3)
order by c3 desc limit 1;
end
//
create table tmp as select * from t1
where c1 in (select a.c2 from t1 a where a.c3 = t1.c3)
order by c3 desc limit 1;
CALL sp;
insert into tmp(c1,c2,c3) select * from t1
where c1 in (select a.c2 from t1 a where a.c3 = t1.c3)
order by c3 desc limit 1;
CALL sp;
insert into tmp(c1,c2,c3) select * from t1
where c1 in (select a.c2 from t1 a where a.c3 = t1.c3)
order by c3 desc limit 1;
CALL sp;
select * from t1;
c1	c2	c3
1	2	2
1	3	3
11	1	11
11	2	12
11	3	13
12	1	14
12	2	15
12	3	16
12	4	17
12	5	18
2	1	4
2	3	6
2	4	7
2	5	8
21	2	21
21	3	22
21	4	23
22	2	24
22	3	25
22	4	26
22	5	27
22	6	28
31	2	31
31	3	32
31	4	33
32	2	34
32	3	35
32	4	36
32	5	37
32	6	38
insert into t1(c1,c2,c3) select c1,c2,c3 from tmp;
drop procedure sp;
drop table tmp;
#
# Delete in stored function
#
create function f1(IN a INT) returns int
begin
delete from t1 where c3 < a  order by c3 limit 1;
return  1;
end;//
set @a:=7;
create table tmp as select * from t1 where c3 < @a
order by c3 limit 1;
select f1(@a);
f1(@a)
1
insert into tmp(c1,c2,c3) select * from t1 where c3 < @a
order by c3 limit 1;
select f1(@a);
f1(@a)
1
select * from t1;
c1	c2	c3
1	3	3
11	1	11
11	2	12
11	3	13
12	1	14
12	2	15
12	3	16
12	4	17
12	5	18
2	1	4
2	2	5
2	3	6
2	4	7
2	5	8
21	2	21
21	3	22
21	4	23
22	2	24
22	3	25
22	4	26
22	5	27
22	6	28
31	2	31
31	3	32
31	4	33
32	2	34
32	3	35
32	4	36
32	5	37
32	6	38
insert into t1(c1,c2,c3) select c1,c2,c3 from tmp;
drop function f1;
drop table tmp;
#
# Delete in trigger
#
create table t2 (c1 integer);
insert into t2(c1) values (1), (2), (3), (4), (5), (6), (7), (8);
CREATE TABLE cnt(del integer);
INSERT INTO cnt VALUES(0);
CREATE TRIGGER tr1 AFTER DELETE ON t1 FOR EACH ROW
UPDATE cnt SET del=del+1;
CREATE TRIGGER tr2 AFTER DELETE ON t1 FOR EACH ROW
DELETE FROM t2 WHERE c1> (SELECT count(*)-1 FROM t2);
CREATE TABLE tmp as SELECT * FROM t1 WHERE c2>=3;
DELETE FROM t1 WHERE c2>=3;
affected rows: 20
select * from t1;
c1	c2	c3
1	1	1
1	2	2
11	1	11
11	2	12
12	1	14
12	2	15
2	1	4
2	2	5
21	2	21
22	2	24
31	2	31
32	2	34
SELECT * FROM t2;
c1
SELECT * FROM cnt;
del
20
insert into t1(c1,c2,c3) select c1,c2,c3 from tmp;
DROP TRIGGER tr1;
DROP TRIGGER tr2;
drop table t2, cnt, tmp;
#
# Delete with a reference to view in subquery
#
create table tmp as select * from t1 where t1.c2 in ( select max(a.c2) from v1 a
where a.c1 = t1.c1);
explain select * from t1 where t1.c2 in ( select max(a.c2) from v1 a
where a.c1 = t1.c1);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	32	Using where
2	DEPENDENT SUBQUERY	t1	ALL	NULL	NULL	NULL	NULL	32	Using where
explain delete from t1 where t1.c2 in ( select max(a.c2) from v1 a
where a.c1 = t1.c1);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	32	Using where
2	DEPENDENT SUBQUERY	t1	ALL	NULL	NULL	NULL	NULL	32	Using where
analyze delete from t1 where t1.c2 in ( select max(a.c2) from v1 a
where a.c1 = t1.c1);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	r_rows	filtered	r_filtered	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	32	32.00	100.00	25.00	Using where
2	DEPENDENT SUBQUERY	t1	ALL	NULL	NULL	NULL	NULL	32	32.00	25.00	3.12	Using where
select * from t1;
c1	c2	c3
1	1	1
1	3	3
11	1	11
11	3	13
12	1	14
12	3	16
12	4	17
12	5	18
2	1	4
2	3	6
2	4	7
2	5	8
21	3	22
21	4	23
22	3	25
22	4	26
22	5	27
22	6	28
31	3	32
31	4	33
32	3	35
32	4	36
32	5	37
32	6	38
insert into t1(c1,c2,c3) select c1,c2,c3 from tmp;
drop table tmp;
#
# Delete with EXISTS subquery over the updated table
# in WHERE + non-sargable condition
#
analyze table t1 persistent for all;
Table	Op	Msg_type	Msg_text
test.t1	analyze	status	Engine-independent statistics collected
test.t1	analyze	status	OK
create table tmp as select * from t1 where exists (select 'X' from t1 a where a.c2 = t1.c2) and c2 = 3;
explain select * from t1 where exists (select 'X' from t1 a where a.c2 = t1.c2) and c2 = 3;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	32	Using where
1	PRIMARY	a	ALL	NULL	NULL	NULL	NULL	32	Using where; FirstMatch(t1); Using join buffer (flat, BNL join)
explain delete from t1 where exists (select 'X' from t1 a where a.c2 = t1.c2) and c2 = 3;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	32	Using where
1	PRIMARY	a	ALL	NULL	NULL	NULL	NULL	32	Using where; FirstMatch(t1)
delete from t1 where exists (select 'X' from t1 a where a.c2 = t1.c2) and c2 = 3;
affected rows: 8
select * from t1;
c1	c2	c3
1	1	1
1	2	2
11	1	11
11	2	12
12	1	14
12	2	15
12	4	17
12	5	18
2	1	4
2	2	5
2	4	7
2	5	8
21	2	21
21	4	23
22	2	24
22	4	26
22	5	27
22	6	28
31	2	31
31	4	33
32	2	34
32	4	36
32	5	37
32	6	38
insert into t1(c1,c2,c3) select c1,c2,c3 from tmp;
drop table tmp;
#
# Delete with order by
#
analyze table t1 persistent for all;
Table	Op	Msg_type	Msg_text
test.t1	analyze	status	Engine-independent statistics collected
test.t1	analyze	status	OK
create table tmp as select * from t1 where exists (select 'X' from t1 a where a.c2 = t1.c2)
and c2 >= 3 order by c2;
explain select * from t1 where exists (select 'X' from t1 a where a.c2 = t1.c2)
and c2 >= 3 order by c2;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	#	Using where; Using filesort
1	PRIMARY	<subquery2>	eq_ref	distinct_key	distinct_key	4	func	#	
2	MATERIALIZED	a	ALL	NULL	NULL	NULL	NULL	#	
explain delete from t1 where exists (select 'X' from t1 a where a.c2 = t1.c2)
and c2 >= 3 order by c2;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	#	Using where
1	PRIMARY	<subquery2>	eq_ref	distinct_key	distinct_key	4	func	#	
2	MATERIALIZED	a	ALL	NULL	NULL	NULL	NULL	#	
analyze delete from t1 where exists (select 'X' from t1 a where a.c2 = t1.c2)
and c2 >= 3 order by c2;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	r_rows	filtered	r_filtered	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	#	32.00	62.50	62.50	Using where
1	PRIMARY	<subquery2>	eq_ref	distinct_key	distinct_key	4	func	#	1.00	100.00	100.00	
2	MATERIALIZED	a	ALL	NULL	NULL	NULL	NULL	#	32.00	62.50	100.00	
select * from t1;
c1	c2	c3
1	1	1
1	2	2
11	1	11
11	2	12
12	1	14
12	2	15
2	1	4
2	2	5
21	2	21
22	2	24
31	2	31
32	2	34
insert into t1(c1,c2,c3) select c1,c2,c3 from tmp;
drop table tmp;
#
# Delete from view
#
analyze table t1 persistent for all;
Table	Op	Msg_type	Msg_text
test.t1	analyze	status	Engine-independent statistics collected
test.t1	analyze	status	OK
create table tmp as select * from v1 where v1.c1 in
(select max(a.c1) from t1 a where a.c2 = v1.c2) and c3 = 5;
explain select * from v1 where v1.c1 in
(select max(a.c1) from t1 a where a.c2 = v1.c2) and c3 = 5;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	const	PRIMARY	PRIMARY	4	const	1	
2	DEPENDENT SUBQUERY	a	ALL	NULL	NULL	NULL	NULL	32	Using where
explain delete from v1 where v1.c1 in
(select max(a.c1) from t1 a where a.c2 = v1.c2) and c3 = 5;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	const	PRIMARY	PRIMARY	4	const	1	
2	DEPENDENT SUBQUERY	a	ALL	NULL	NULL	NULL	NULL	32	Using where
delete from v1 where v1.c1 in
(select max(a.c1) from t1 a where a.c2 = v1.c2) and c3 = 5;
affected rows: 0
select * from t1;
c1	c2	c3
1	1	1
1	2	2
1	3	3
11	1	11
11	2	12
11	3	13
12	1	14
12	2	15
12	3	16
12	4	17
12	5	18
2	1	4
2	2	5
2	3	6
2	4	7
2	5	8
21	2	21
21	3	22
21	4	23
22	2	24
22	3	25
22	4	26
22	5	27
22	6	28
31	2	31
31	3	32
31	4	33
32	2	34
32	3	35
32	4	36
32	5	37
32	6	38
insert into t1(c1,c2,c3) select c1,c2,c3 from tmp;
drop table tmp;
#
# Delete from view using reference
# to the same view in subquery
#
analyze table t1 persistent for all;
Table	Op	Msg_type	Msg_text
test.t1	analyze	status	Engine-independent statistics collected
test.t1	analyze	status	Table is already up to date
create table tmp as select * from v1 where v1.c2 in (select max(a.c2) from t1 a where a.c3 = v1.c3)
and c1 = 2
and exists (select 'X' from v1 a where a.c1 = v1.c1);
explain select * from v1 where v1.c2 in (select max(a.c2) from t1 a where a.c3 = v1.c3)
and c1 = 2
and exists (select 'X' from v1 a where a.c1 = v1.c1);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	#	Using where
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	#	Using where; FirstMatch(t1); Using join buffer (flat, BNL join)
2	DEPENDENT SUBQUERY	a	eq_ref	PRIMARY	PRIMARY	4	test.t1.c3	#	
explain delete from v1 where v1.c2 in (select max(a.c2) from t1 a where a.c3 = v1.c3)
and c1 = 2
and exists (select 'X' from v1 a where a.c1 = v1.c1);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	#	Using where
3	DEPENDENT SUBQUERY	t1	ALL	NULL	NULL	NULL	NULL	#	Using where
2	DEPENDENT SUBQUERY	a	eq_ref	PRIMARY	PRIMARY	4	test.t1.c3	#	
analyze delete from v1 where v1.c2 in (select max(a.c2) from t1 a where a.c3 = v1.c3)
and c1 = 2
and exists (select 'X' from v1 a where a.c1 = v1.c1);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	r_rows	filtered	r_filtered	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	#	32.00	3.91	3.12	Using where
3	DEPENDENT SUBQUERY	t1	ALL	NULL	NULL	NULL	NULL	#	6.00	25.00	16.67	Using where
2	DEPENDENT SUBQUERY	a	eq_ref	PRIMARY	PRIMARY	4	test.t1.c3	#	1.00	100.00	100.00	
select * from t1;
c1	c2	c3
1	1	1
1	2	2
1	3	3
11	1	11
11	2	12
11	3	13
12	1	14
12	2	15
12	3	16
12	4	17
12	5	18
2	1	4
2	3	6
2	4	7
2	5	8
21	2	21
21	3	22
21	4	23
22	2	24
22	3	25
22	4	26
22	5	27
22	6	28
31	2	31
31	3	32
31	4	33
32	2	34
32	3	35
32	4	36
32	5	37
32	6	38
insert into t1(c1,c2,c3) select c1,c2,c3 from tmp;
drop table tmp;
drop view v1;
drop table t1;
#
# Test on dynamic columns (blob)
#
create table assets (
item_name varchar(32) primary key, -- A common attribute for all items
dynamic_cols  blob  -- Dynamic columns will be stored here
);
INSERT INTO assets
VALUES ('MariaDB T-shirt',
COLUMN_CREATE('color', 'blue', 'size', 'XL'));
INSERT INTO assets
VALUES ('Thinkpad Laptop',
COLUMN_CREATE('color', 'black', 'price', 500));
INSERT INTO assets
VALUES ('Fridge',
COLUMN_CREATE('color', 'white', 'warranty', '5 years'));
INSERT INTO assets
VALUES ('Microwave',
COLUMN_CREATE('warranty', '3 years'));
SELECT item_name, COLUMN_GET(dynamic_cols, 'color' as char) AS color
FROM assets ORDER BY item_name;
item_name	color
Fridge	white
MariaDB T-shirt	blue
Microwave	NULL
Thinkpad Laptop	black
UPDATE assets SET dynamic_cols=COLUMN_DELETE(dynamic_cols, 'color')
WHERE item_name='Fridge';
SELECT item_name, COLUMN_GET(dynamic_cols, 'color' as char) AS color
FROM assets ORDER BY item_name;
item_name	color
Fridge	NULL
MariaDB T-shirt	blue
Microwave	NULL
Thinkpad Laptop	black
DELETE FROM assets
WHERE item_name in
(select b.item_name from assets b
where COLUMN_GET(b.dynamic_cols, 'color' as char) ='black');
SELECT item_name, COLUMN_GET(dynamic_cols, 'color' as char) AS color
FROM assets ORDER BY item_name;
item_name	color
Fridge	NULL
MariaDB T-shirt	blue
Microwave	NULL
DELETE FROM assets WHERE item_name='Microwave';
SELECT item_name, COLUMN_GET(dynamic_cols, 'color' as char) AS color
FROM assets ORDER BY item_name;
item_name	color
Fridge	NULL
MariaDB T-shirt	blue
drop table assets ;
#
# Test on fulltext columns
#
CREATE TABLE ft2(copy TEXT,FULLTEXT(copy));
INSERT INTO ft2(copy) VALUES
('MySQL vs MariaDB database'),
('Oracle vs MariaDB database'),
('PostgreSQL vs MariaDB database'),
('MariaDB overview'),
('Foreign keys'),
('Primary keys'),
('Indexes'),
('Transactions'),
('Triggers');
SELECT * FROM ft2 WHERE MATCH(copy) AGAINST('database');
copy
MySQL vs MariaDB database
Oracle vs MariaDB database
PostgreSQL vs MariaDB database
DELETE FROM ft2 WHERE  MATCH(copy) AGAINST('database');
SELECT * FROM ft2 WHERE MATCH(copy) AGAINST('database');
copy
drop table ft2;
#######################################
#                                     #
#            Engine MyISAM            #
#                                     #
#######################################
set default_storage_engine=MyISAM;
create table t1 (c1 integer, c2 integer, c3 integer);
insert into t1(c1,c2,c3)
values (1,1,1),(1,2,2),(1,3,3),
(2,1,4),(2,2,5),(2,3,6),
(2,4,7),(2,5,8);
insert into t1 select c1+10,c2,c3+10 from t1;
insert into t1 select c1+20,c2+1,c3+20 from t1;
analyze table t1 persistent for all;
Table	Op	Msg_type	Msg_text
test.t1	analyze	status	Engine-independent statistics collected
test.t1	analyze	status	OK
create view v1 as select * from t1 where c2=2;
#######################################
#        Test without any index       #
#######################################
#
# Delete with value from subquery on the same table
#
analyze table t1 persistent for all;
Table	Op	Msg_type	Msg_text
test.t1	analyze	status	Engine-independent statistics collected
test.t1	analyze	status	Table is already up to date
create table tmp as select * from t1 where c1=(select a.c3 from t1 a where a.c3 = t1.c3);
explain select * from t1 where c1=(select a.c3 from t1 a where a.c3 = t1.c3);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	32	Using where
2	DEPENDENT SUBQUERY	a	ALL	NULL	NULL	NULL	NULL	32	Using where
explain delete from t1 where c1=(select a.c3 from t1 a where a.c3 = t1.c3);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	32	Using where
2	DEPENDENT SUBQUERY	a	ALL	NULL	NULL	NULL	NULL	32	Using where
delete from t1 where c1=(select a.c3 from t1 a where a.c3 = t1.c3);
affected rows: 4
select * from t1;
c1	c2	c3
1	2	2
1	3	3
11	2	12
11	3	13
12	1	14
12	2	15
12	3	16
12	4	17
12	5	18
2	1	4
2	2	5
2	3	6
2	4	7
2	5	8
21	3	22
21	4	23
22	2	24
22	3	25
22	4	26
22	5	27
22	6	28
31	3	32
31	4	33
32	2	34
32	3	35
32	4	36
32	5	37
32	6	38
insert into t1(c1,c2,c3) select c1,c2,c3 from tmp;
drop table tmp;
#
# Delete with EXISTS subquery over the updated table
# in WHERE + possibly sargable condition
#
analyze table t1 persistent for all;
Table	Op	Msg_type	Msg_text
test.t1	analyze	status	Engine-independent statistics collected
test.t1	analyze	status	OK
create table tmp as select * from t1 where c1 = 1 and exists (select 'X' from t1 a where a.c1 = t1.c2);
explain select * from t1 where c1 = 1 and exists (select 'X' from t1 a where a.c1 = t1.c2);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	32	Using where
1	PRIMARY	a	ALL	NULL	NULL	NULL	NULL	32	Using where; FirstMatch(t1); Using join buffer (flat, BNL join)
explain delete from t1 where c1 = 1 and exists (select 'X' from t1 a where a.c1 = t1.c2);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	32	Using where
1	PRIMARY	a	ALL	NULL	NULL	NULL	NULL	32	Using where; FirstMatch(t1)
analyze delete from t1 where c1 = 1 and exists (select 'X' from t1 a where a.c1 = t1.c2);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	r_rows	filtered	r_filtered	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	32	32.00	9.38	9.38	Using where
1	PRIMARY	a	ALL	NULL	NULL	NULL	NULL	32	12.67	3.12	5.26	Using where; FirstMatch(t1)
select * from t1;
c1	c2	c3
1	3	3
11	1	11
11	2	12
11	3	13
12	1	14
12	2	15
12	3	16
12	4	17
12	5	18
2	1	4
2	2	5
2	3	6
2	4	7
2	5	8
21	2	21
21	3	22
21	4	23
22	2	24
22	3	25
22	4	26
22	5	27
22	6	28
31	2	31
31	3	32
31	4	33
32	2	34
32	3	35
32	4	36
32	5	37
32	6	38
insert into t1(c1,c2,c3) select c1,c2,c3 from tmp;
drop table tmp;
#
# Delete with IN predicand over the updated table in WHERE
#
create table tmp as select * from t1 where c3 in (select distinct a.c1 from t1 a where t1.c2=a.c2);
explain select * from t1 where c3 in (select distinct a.c1 from t1 a where t1.c2=a.c2);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	32	
1	PRIMARY	a	ALL	NULL	NULL	NULL	NULL	32	Using where; FirstMatch(t1); Using join buffer (flat, BNL join)
explain delete from t1 where c3 in (select distinct a.c1 from t1 a where t1.c2=a.c2);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	32	
1	PRIMARY	a	ALL	NULL	NULL	NULL	NULL	32	Using where; FirstMatch(t1)
delete from t1 where c3 in (select distinct a.c1 from t1 a where t1.c2=a.c2);
affected rows: 8
select * from t1;
c1	c2	c3
1	3	3
11	3	13
12	1	14
12	2	15
12	3	16
12	4	17
12	5	18
2	1	4
2	2	5
2	3	6
2	4	7
2	5	8
21	4	23
22	2	24
22	3	25
22	4	26
22	5	27
22	6	28
31	4	33
32	2	34
32	3	35
32	4	36
32	5	37
32	6	38
insert into t1(c1,c2,c3) select c1,c2,c3 from tmp;
drop table tmp;
#
# Delete with a limit - can be deleted
#
create table tmp as select * from t1 where c1 in (select a.c2 from t1 a where a.c2 = t1.c3) limit 1;
explain select * from t1 where c1 in (select a.c2 from t1 a where a.c2 = t1.c3) limit 1;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	32	Using where
1	PRIMARY	a	ALL	NULL	NULL	NULL	NULL	32	Using where; FirstMatch(t1); Using join buffer (flat, BNL join)
explain delete from t1 where c1 in (select a.c2 from t1 a where a.c2 = t1.c3) limit 1;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	32	Using where
1	PRIMARY	a	ALL	NULL	NULL	NULL	NULL	32	Using where; FirstMatch(t1)
analyze delete from t1 where c1 in (select a.c2 from t1 a where a.c2 = t1.c3) limit 1;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	r_rows	filtered	r_filtered	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	32	25.00	100.00	12.00	Using where
1	PRIMARY	a	ALL	NULL	NULL	NULL	NULL	32	22.67	3.12	1.47	Using where; FirstMatch(t1)
select * from t1;
c1	c2	c3
1	2	2
1	3	3
11	1	11
11	2	12
11	3	13
12	1	14
12	2	15
12	3	16
12	4	17
12	5	18
2	1	4
2	2	5
2	3	6
2	4	7
2	5	8
21	2	21
21	3	22
21	4	23
22	2	24
22	3	25
22	4	26
22	5	27
22	6	28
31	2	31
31	3	32
31	4	33
32	2	34
32	3	35
32	4	36
32	5	37
32	6	38
insert into t1(c1,c2,c3) select c1,c2,c3 from tmp;
drop table tmp;
#
# Delete with a limit and an order by
#
create table tmp as select * from t1 where c1 in (select a.c2 from t1 a where a.c3 = t1.c3)
order by c3 desc limit 1;
explain select * from t1 where c1 in (select a.c2 from t1 a where a.c3 = t1.c3)
order by c3 desc limit 1;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	32	Using temporary; Using filesort
1	PRIMARY	a	ALL	NULL	NULL	NULL	NULL	32	Using where; FirstMatch(t1); Using join buffer (flat, BNL join)
explain delete from t1 where c1 in (select a.c2 from t1 a where a.c3 = t1.c3)
order by c3 desc limit 1;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	32	Using where; Using filesort
2	DEPENDENT SUBQUERY	a	ALL	NULL	NULL	NULL	NULL	32	Using where
delete from t1 where c1 in (select a.c2 from t1 a where a.c3 = t1.c3)
order by c3 desc limit 1;
affected rows: 1
select * from t1;
c1	c2	c3
1	1	1
1	2	2
1	3	3
11	1	11
11	2	12
11	3	13
12	1	14
12	2	15
12	3	16
12	4	17
12	5	18
2	1	4
2	3	6
2	4	7
2	5	8
21	2	21
21	3	22
21	4	23
22	2	24
22	3	25
22	4	26
22	5	27
22	6	28
31	2	31
31	3	32
31	4	33
32	2	34
32	3	35
32	4	36
32	5	37
32	6	38
insert into t1(c1,c2,c3) select c1,c2,c3 from tmp;
drop table tmp;
#
# Delete: 2 execution of PS
#
prepare create_tmp_stmt from
"create table tmp as select * from t1
      where c2=(select a.c3 from t1 a where a.c3 = ?)";
prepare delete_t1_stmt from
"delete from t1 where c2=(select a.c3 from t1 a where a.c3 = ?)";
set @a:=5;
execute create_tmp_stmt using @a;
execute delete_t1_stmt using @a;
execute delete_t1_stmt using @a;
select * from t1;
c1	c2	c3
1	1	1
1	2	2
1	3	3
11	1	11
11	2	12
11	3	13
12	1	14
12	2	15
12	3	16
12	4	17
2	1	4
2	2	5
2	3	6
2	4	7
21	2	21
21	3	22
21	4	23
22	2	24
22	3	25
22	4	26
22	6	28
31	2	31
31	3	32
31	4	33
32	2	34
32	3	35
32	4	36
32	6	38
prepare insert_tmp_stmt from
"insert into tmp(c1,c2,c3) select * from t1
      where c2=(select a.c3 from t1 a where a.c3 = ?)";
set @a:=2;
execute insert_tmp_stmt using @a;
execute delete_t1_stmt using @a;
select * from t1;
c1	c2	c3
1	1	1
1	3	3
11	1	11
11	3	13
12	1	14
12	3	16
12	4	17
2	1	4
2	3	6
2	4	7
21	3	22
21	4	23
22	3	25
22	4	26
22	6	28
31	3	32
31	4	33
32	3	35
32	4	36
32	6	38
insert into t1(c1,c2,c3) select c1,c2,c3 from tmp;
select * from t1;
c1	c2	c3
1	1	1
1	2	2
1	3	3
11	1	11
11	2	12
11	3	13
12	1	14
12	2	15
12	3	16
12	4	17
12	5	18
2	1	4
2	2	5
2	3	6
2	4	7
2	5	8
21	2	21
21	3	22
21	4	23
22	2	24
22	3	25
22	4	26
22	5	27
22	6	28
31	2	31
31	3	32
31	4	33
32	2	34
32	3	35
32	4	36
32	5	37
32	6	38
drop table tmp;
#
# Delete in stored procedure
#
create procedure sp()
begin
delete from t1 where c1 in (select a.c2 from t1 a where a.c3 = t1.c3)
order by c3 desc limit 1;
end
//
create table tmp as select * from t1
where c1 in (select a.c2 from t1 a where a.c3 = t1.c3)
order by c3 desc limit 1;
CALL sp;
insert into tmp(c1,c2,c3) select * from t1
where c1 in (select a.c2 from t1 a where a.c3 = t1.c3)
order by c3 desc limit 1;
CALL sp;
insert into tmp(c1,c2,c3) select * from t1
where c1 in (select a.c2 from t1 a where a.c3 = t1.c3)
order by c3 desc limit 1;
CALL sp;
select * from t1;
c1	c2	c3
1	2	2
1	3	3
11	1	11
11	2	12
11	3	13
12	1	14
12	2	15
12	3	16
12	4	17
12	5	18
2	1	4
2	3	6
2	4	7
2	5	8
21	2	21
21	3	22
21	4	23
22	2	24
22	3	25
22	4	26
22	5	27
22	6	28
31	2	31
31	3	32
31	4	33
32	2	34
32	3	35
32	4	36
32	5	37
32	6	38
insert into t1(c1,c2,c3) select c1,c2,c3 from tmp;
drop procedure sp;
drop table tmp;
#
# Delete in stored function
#
create function f1(IN a INT) returns int
begin
delete from t1 where c3 < a  order by c3 limit 1;
return  1;
end;//
set @a:=7;
create table tmp as select * from t1 where c3 < @a
order by c3 limit 1;
select f1(@a);
f1(@a)
1
insert into tmp(c1,c2,c3) select * from t1 where c3 < @a
order by c3 limit 1;
select f1(@a);
f1(@a)
1
select * from t1;
c1	c2	c3
1	3	3
11	1	11
11	2	12
11	3	13
12	1	14
12	2	15
12	3	16
12	4	17
12	5	18
2	1	4
2	2	5
2	3	6
2	4	7
2	5	8
21	2	21
21	3	22
21	4	23
22	2	24
22	3	25
22	4	26
22	5	27
22	6	28
31	2	31
31	3	32
31	4	33
32	2	34
32	3	35
32	4	36
32	5	37
32	6	38
insert into t1(c1,c2,c3) select c1,c2,c3 from tmp;
drop function f1;
drop table tmp;
#
# Delete in trigger
#
create table t2 (c1 integer);
insert into t2(c1) values (1), (2), (3), (4), (5), (6), (7), (8);
CREATE TABLE cnt(del integer);
INSERT INTO cnt VALUES(0);
CREATE TRIGGER tr1 AFTER DELETE ON t1 FOR EACH ROW
UPDATE cnt SET del=del+1;
CREATE TRIGGER tr2 AFTER DELETE ON t1 FOR EACH ROW
DELETE FROM t2 WHERE c1> (SELECT count(*)-1 FROM t2);
CREATE TABLE tmp as SELECT * FROM t1 WHERE c2>=3;
DELETE FROM t1 WHERE c2>=3;
affected rows: 20
select * from t1;
c1	c2	c3
1	1	1
1	2	2
11	1	11
11	2	12
12	1	14
12	2	15
2	1	4
2	2	5
21	2	21
22	2	24
31	2	31
32	2	34
SELECT * FROM t2;
c1
SELECT * FROM cnt;
del
20
insert into t1(c1,c2,c3) select c1,c2,c3 from tmp;
DROP TRIGGER tr1;
DROP TRIGGER tr2;
drop table t2, cnt, tmp;
#
# Delete with a reference to view in subquery
#
create table tmp as select * from t1 where t1.c2 in ( select max(a.c2) from v1 a
where a.c1 = t1.c1);
explain select * from t1 where t1.c2 in ( select max(a.c2) from v1 a
where a.c1 = t1.c1);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	32	Using where
2	DEPENDENT SUBQUERY	t1	ALL	NULL	NULL	NULL	NULL	32	Using where
explain delete from t1 where t1.c2 in ( select max(a.c2) from v1 a
where a.c1 = t1.c1);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	32	Using where
2	DEPENDENT SUBQUERY	t1	ALL	NULL	NULL	NULL	NULL	32	Using where
analyze delete from t1 where t1.c2 in ( select max(a.c2) from v1 a
where a.c1 = t1.c1);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	r_rows	filtered	r_filtered	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	32	32.00	100.00	25.00	Using where
2	DEPENDENT SUBQUERY	t1	ALL	NULL	NULL	NULL	NULL	32	32.00	25.00	3.12	Using where
select * from t1;
c1	c2	c3
1	1	1
1	3	3
11	1	11
11	3	13
12	1	14
12	3	16
12	4	17
12	5	18
2	1	4
2	3	6
2	4	7
2	5	8
21	3	22
21	4	23
22	3	25
22	4	26
22	5	27
22	6	28
31	3	32
31	4	33
32	3	35
32	4	36
32	5	37
32	6	38
insert into t1(c1,c2,c3) select c1,c2,c3 from tmp;
drop table tmp;
#
# Delete with EXISTS subquery over the updated table
# in WHERE + non-sargable condition
#
analyze table t1 persistent for all;
Table	Op	Msg_type	Msg_text
test.t1	analyze	status	Engine-independent statistics collected
test.t1	analyze	status	OK
create table tmp as select * from t1 where exists (select 'X' from t1 a where a.c2 = t1.c2) and c2 = 3;
explain select * from t1 where exists (select 'X' from t1 a where a.c2 = t1.c2) and c2 = 3;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	32	Using where
1	PRIMARY	a	ALL	NULL	NULL	NULL	NULL	32	Using where; FirstMatch(t1); Using join buffer (flat, BNL join)
explain delete from t1 where exists (select 'X' from t1 a where a.c2 = t1.c2) and c2 = 3;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	32	Using where
1	PRIMARY	a	ALL	NULL	NULL	NULL	NULL	32	Using where; FirstMatch(t1)
delete from t1 where exists (select 'X' from t1 a where a.c2 = t1.c2) and c2 = 3;
affected rows: 8
select * from t1;
c1	c2	c3
1	1	1
1	2	2
11	1	11
11	2	12
12	1	14
12	2	15
12	4	17
12	5	18
2	1	4
2	2	5
2	4	7
2	5	8
21	2	21
21	4	23
22	2	24
22	4	26
22	5	27
22	6	28
31	2	31
31	4	33
32	2	34
32	4	36
32	5	37
32	6	38
insert into t1(c1,c2,c3) select c1,c2,c3 from tmp;
drop table tmp;
#
# Delete with order by
#
analyze table t1 persistent for all;
Table	Op	Msg_type	Msg_text
test.t1	analyze	status	Engine-independent statistics collected
test.t1	analyze	status	OK
create table tmp as select * from t1 where exists (select 'X' from t1 a where a.c2 = t1.c2)
and c2 >= 3 order by c2;
explain select * from t1 where exists (select 'X' from t1 a where a.c2 = t1.c2)
and c2 >= 3 order by c2;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	#	Using where; Using filesort
1	PRIMARY	<subquery2>	eq_ref	distinct_key	distinct_key	4	func	#	
2	MATERIALIZED	a	ALL	NULL	NULL	NULL	NULL	#	
explain delete from t1 where exists (select 'X' from t1 a where a.c2 = t1.c2)
and c2 >= 3 order by c2;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	#	Using where
1	PRIMARY	<subquery2>	eq_ref	distinct_key	distinct_key	4	func	#	
2	MATERIALIZED	a	ALL	NULL	NULL	NULL	NULL	#	
analyze delete from t1 where exists (select 'X' from t1 a where a.c2 = t1.c2)
and c2 >= 3 order by c2;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	r_rows	filtered	r_filtered	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	#	32.00	62.50	62.50	Using where
1	PRIMARY	<subquery2>	eq_ref	distinct_key	distinct_key	4	func	#	1.00	100.00	100.00	
2	MATERIALIZED	a	ALL	NULL	NULL	NULL	NULL	#	32.00	62.50	100.00	
select * from t1;
c1	c2	c3
1	1	1
1	2	2
11	1	11
11	2	12
12	1	14
12	2	15
2	1	4
2	2	5
21	2	21
22	2	24
31	2	31
32	2	34
insert into t1(c1,c2,c3) select c1,c2,c3 from tmp;
drop table tmp;
#
# Delete from view
#
analyze table t1 persistent for all;
Table	Op	Msg_type	Msg_text
test.t1	analyze	status	Engine-independent statistics collected
test.t1	analyze	status	OK
create table tmp as select * from v1 where v1.c1 in
(select max(a.c1) from t1 a where a.c2 = v1.c2) and c3 = 5;
explain select * from v1 where v1.c1 in
(select max(a.c1) from t1 a where a.c2 = v1.c2) and c3 = 5;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	32	Using where
2	DEPENDENT SUBQUERY	a	ALL	NULL	NULL	NULL	NULL	32	Using where
explain delete from v1 where v1.c1 in
(select max(a.c1) from t1 a where a.c2 = v1.c2) and c3 = 5;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	32	Using where
2	DEPENDENT SUBQUERY	a	ALL	NULL	NULL	NULL	NULL	32	Using where
delete from v1 where v1.c1 in
(select max(a.c1) from t1 a where a.c2 = v1.c2) and c3 = 5;
affected rows: 0
select * from t1;
c1	c2	c3
1	1	1
1	2	2
1	3	3
11	1	11
11	2	12
11	3	13
12	1	14
12	2	15
12	3	16
12	4	17
12	5	18
2	1	4
2	2	5
2	3	6
2	4	7
2	5	8
21	2	21
21	3	22
21	4	23
22	2	24
22	3	25
22	4	26
22	5	27
22	6	28
31	2	31
31	3	32
31	4	33
32	2	34
32	3	35
32	4	36
32	5	37
32	6	38
insert into t1(c1,c2,c3) select c1,c2,c3 from tmp;
drop table tmp;
#
# Delete from view using reference
# to the same view in subquery
#
analyze table t1 persistent for all;
Table	Op	Msg_type	Msg_text
test.t1	analyze	status	Engine-independent statistics collected
test.t1	analyze	status	Table is already up to date
create table tmp as select * from v1 where v1.c2 in (select max(a.c2) from t1 a where a.c3 = v1.c3)
and c1 = 2
and exists (select 'X' from v1 a where a.c1 = v1.c1);
explain select * from v1 where v1.c2 in (select max(a.c2) from t1 a where a.c3 = v1.c3)
and c1 = 2
and exists (select 'X' from v1 a where a.c1 = v1.c1);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	#	Using where
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	#	Using where; FirstMatch(t1); Using join buffer (flat, BNL join)
2	DEPENDENT SUBQUERY	a	ALL	NULL	NULL	NULL	NULL	#	Using where
explain delete from v1 where v1.c2 in (select max(a.c2) from t1 a where a.c3 = v1.c3)
and c1 = 2
and exists (select 'X' from v1 a where a.c1 = v1.c1);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	#	Using where
3	DEPENDENT SUBQUERY	t1	ALL	NULL	NULL	NULL	NULL	#	Using where
2	DEPENDENT SUBQUERY	a	ALL	NULL	NULL	NULL	NULL	#	Using where
analyze delete from v1 where v1.c2 in (select max(a.c2) from t1 a where a.c3 = v1.c3)
and c1 = 2
and exists (select 'X' from v1 a where a.c1 = v1.c1);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	r_rows	filtered	r_filtered	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	#	32.00	3.91	3.12	Using where
3	DEPENDENT SUBQUERY	t1	ALL	NULL	NULL	NULL	NULL	#	5.00	25.00	20.00	Using where
2	DEPENDENT SUBQUERY	a	ALL	NULL	NULL	NULL	NULL	#	32.00	100.00	3.12	Using where
select * from t1;
c1	c2	c3
1	1	1
1	2	2
1	3	3
11	1	11
11	2	12
11	3	13
12	1	14
12	2	15
12	3	16
12	4	17
12	5	18
2	1	4
2	3	6
2	4	7
2	5	8
21	2	21
21	3	22
21	4	23
22	2	24
22	3	25
22	4	26
22	5	27
22	6	28
31	2	31
31	3	32
31	4	33
32	2	34
32	3	35
32	4	36
32	5	37
32	6	38
insert into t1(c1,c2,c3) select c1,c2,c3 from tmp;
drop table tmp;
#######################################
#          Test with an index         #
#######################################
create index t1_c2 on t1 (c2,c1);
#
# Delete with value from subquery on the same table
#
analyze table t1 persistent for all;
Table	Op	Msg_type	Msg_text
test.t1	analyze	status	Engine-independent statistics collected
test.t1	analyze	status	OK
create table tmp as select * from t1 where c1=(select a.c3 from t1 a where a.c3 = t1.c3);
explain select * from t1 where c1=(select a.c3 from t1 a where a.c3 = t1.c3);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	32	Using where
2	DEPENDENT SUBQUERY	a	ALL	NULL	NULL	NULL	NULL	32	Using where
explain delete from t1 where c1=(select a.c3 from t1 a where a.c3 = t1.c3);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	32	Using where
2	DEPENDENT SUBQUERY	a	ALL	NULL	NULL	NULL	NULL	32	Using where
delete from t1 where c1=(select a.c3 from t1 a where a.c3 = t1.c3);
affected rows: 4
select * from t1;
c1	c2	c3
1	2	2
1	3	3
11	2	12
11	3	13
12	1	14
12	2	15
12	3	16
12	4	17
12	5	18
2	1	4
2	2	5
2	3	6
2	4	7
2	5	8
21	3	22
21	4	23
22	2	24
22	3	25
22	4	26
22	5	27
22	6	28
31	3	32
31	4	33
32	2	34
32	3	35
32	4	36
32	5	37
32	6	38
insert into t1(c1,c2,c3) select c1,c2,c3 from tmp;
drop table tmp;
#
# Delete with EXISTS subquery over the updated table
# in WHERE + possibly sargable condition
#
analyze table t1 persistent for all;
Table	Op	Msg_type	Msg_text
test.t1	analyze	status	Engine-independent statistics collected
test.t1	analyze	status	OK
create table tmp as select * from t1 where c1 = 1 and exists (select 'X' from t1 a where a.c1 = t1.c2);
explain select * from t1 where c1 = 1 and exists (select 'X' from t1 a where a.c1 = t1.c2);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	t1_c2	NULL	NULL	NULL	32	Using where
1	PRIMARY	a	index	NULL	t1_c2	10	NULL	32	Using where; Using index; FirstMatch(t1); Using join buffer (flat, BNL join)
explain delete from t1 where c1 = 1 and exists (select 'X' from t1 a where a.c1 = t1.c2);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	t1_c2	NULL	NULL	NULL	32	Using where
1	PRIMARY	a	index	NULL	t1_c2	10	NULL	32	Using where; Using index; FirstMatch(t1)
analyze delete from t1 where c1 = 1 and exists (select 'X' from t1 a where a.c1 = t1.c2);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	r_rows	filtered	r_filtered	Extra
1	PRIMARY	t1	ALL	t1_c2	NULL	NULL	NULL	32	32.00	9.38	9.38	Using where
1	PRIMARY	a	index	NULL	t1_c2	10	NULL	32	11.67	3.12	5.71	Using where; Using index; FirstMatch(t1)
select * from t1;
c1	c2	c3
1	3	3
11	1	11
11	2	12
11	3	13
12	1	14
12	2	15
12	3	16
12	4	17
12	5	18
2	1	4
2	2	5
2	3	6
2	4	7
2	5	8
21	2	21
21	3	22
21	4	23
22	2	24
22	3	25
22	4	26
22	5	27
22	6	28
31	2	31
31	3	32
31	4	33
32	2	34
32	3	35
32	4	36
32	5	37
32	6	38
insert into t1(c1,c2,c3) select c1,c2,c3 from tmp;
drop table tmp;
#
# Delete with IN predicand over the updated table in WHERE
#
create table tmp as select * from t1 where c3 in (select distinct a.c1 from t1 a where t1.c2=a.c2);
explain select * from t1 where c3 in (select distinct a.c1 from t1 a where t1.c2=a.c2);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	t1_c2	NULL	NULL	NULL	32	Using where
1	PRIMARY	a	ref	t1_c2	t1_c2	10	test.t1.c2,test.t1.c3	1	Using index; FirstMatch(t1)
explain delete from t1 where c3 in (select distinct a.c1 from t1 a where t1.c2=a.c2);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	t1_c2	NULL	NULL	NULL	32	Using where
1	PRIMARY	a	ref	t1_c2	t1_c2	10	test.t1.c2,test.t1.c3	1	Using index; FirstMatch(t1)
delete from t1 where c3 in (select distinct a.c1 from t1 a where t1.c2=a.c2);
affected rows: 8
select * from t1;
c1	c2	c3
1	3	3
11	3	13
12	1	14
12	2	15
12	3	16
12	4	17
12	5	18
2	1	4
2	2	5
2	3	6
2	4	7
2	5	8
21	4	23
22	2	24
22	3	25
22	4	26
22	5	27
22	6	28
31	4	33
32	2	34
32	3	35
32	4	36
32	5	37
32	6	38
insert into t1(c1,c2,c3) select c1,c2,c3 from tmp;
drop table tmp;
#
# Delete with a limit - can be deleted
#
create table tmp as select * from t1 where c1 in (select a.c2 from t1 a where a.c2 = t1.c3) limit 1;
explain select * from t1 where c1 in (select a.c2 from t1 a where a.c2 = t1.c3) limit 1;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	32	Using where
1	PRIMARY	a	ref	t1_c2	t1_c2	5	test.t1.c1	5	Using index; FirstMatch(t1)
explain delete from t1 where c1 in (select a.c2 from t1 a where a.c2 = t1.c3) limit 1;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	32	Using where
1	PRIMARY	a	ref	t1_c2	t1_c2	5	test.t1.c1	5	Using index; FirstMatch(t1)
analyze delete from t1 where c1 in (select a.c2 from t1 a where a.c2 = t1.c3) limit 1;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	r_rows	filtered	r_filtered	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	32	29.00	100.00	13.79	Using where
1	PRIMARY	a	ref	t1_c2	t1_c2	5	test.t1.c1	5	0.25	18.75	100.00	Using index; FirstMatch(t1)
select * from t1;
c1	c2	c3
1	2	2
1	3	3
11	1	11
11	2	12
11	3	13
12	1	14
12	2	15
12	3	16
12	4	17
12	5	18
2	1	4
2	2	5
2	3	6
2	4	7
2	5	8
21	2	21
21	3	22
21	4	23
22	2	24
22	3	25
22	4	26
22	5	27
22	6	28
31	2	31
31	3	32
31	4	33
32	2	34
32	3	35
32	4	36
32	5	37
32	6	38
insert into t1(c1,c2,c3) select c1,c2,c3 from tmp;
drop table tmp;
#
# Delete with a limit and an order by
#
create table tmp as select * from t1 where c1 in (select a.c2 from t1 a where a.c3 = t1.c3)
order by c3 desc limit 1;
explain select * from t1 where c1 in (select a.c2 from t1 a where a.c3 = t1.c3)
order by c3 desc limit 1;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	32	Using temporary; Using filesort
1	PRIMARY	a	ALL	t1_c2	NULL	NULL	NULL	32	Using where; FirstMatch(t1); Using join buffer (flat, BNL join)
explain delete from t1 where c1 in (select a.c2 from t1 a where a.c3 = t1.c3)
order by c3 desc limit 1;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	32	Using where; Using filesort
2	DEPENDENT SUBQUERY	a	index_subquery	t1_c2	t1_c2	5	func	5	Using where
delete from t1 where c1 in (select a.c2 from t1 a where a.c3 = t1.c3)
order by c3 desc limit 1;
affected rows: 1
select * from t1;
c1	c2	c3
1	1	1
1	2	2
1	3	3
11	1	11
11	2	12
11	3	13
12	1	14
12	2	15
12	3	16
12	4	17
12	5	18
2	1	4
2	3	6
2	4	7
2	5	8
21	2	21
21	3	22
21	4	23
22	2	24
22	3	25
22	4	26
22	5	27
22	6	28
31	2	31
31	3	32
31	4	33
32	2	34
32	3	35
32	4	36
32	5	37
32	6	38
insert into t1(c1,c2,c3) select c1,c2,c3 from tmp;
drop table tmp;
#
# Delete: 2 execution of PS
#
prepare create_tmp_stmt from
"create table tmp as select * from t1
      where c2=(select a.c3 from t1 a where a.c3 = ?)";
prepare delete_t1_stmt from
"delete from t1 where c2=(select a.c3 from t1 a where a.c3 = ?)";
set @a:=5;
execute create_tmp_stmt using @a;
execute delete_t1_stmt using @a;
execute delete_t1_stmt using @a;
select * from t1;
c1	c2	c3
1	1	1
1	2	2
1	3	3
11	1	11
11	2	12
11	3	13
12	1	14
12	2	15
12	3	16
12	4	17
2	1	4
2	2	5
2	3	6
2	4	7
21	2	21
21	3	22
21	4	23
22	2	24
22	3	25
22	4	26
22	6	28
31	2	31
31	3	32
31	4	33
32	2	34
32	3	35
32	4	36
32	6	38
prepare insert_tmp_stmt from
"insert into tmp(c1,c2,c3) select * from t1
      where c2=(select a.c3 from t1 a where a.c3 = ?)";
set @a:=2;
execute insert_tmp_stmt using @a;
execute delete_t1_stmt using @a;
select * from t1;
c1	c2	c3
1	1	1
1	3	3
11	1	11
11	3	13
12	1	14
12	3	16
12	4	17
2	1	4
2	3	6
2	4	7
21	3	22
21	4	23
22	3	25
22	4	26
22	6	28
31	3	32
31	4	33
32	3	35
32	4	36
32	6	38
insert into t1(c1,c2,c3) select c1,c2,c3 from tmp;
select * from t1;
c1	c2	c3
1	1	1
1	2	2
1	3	3
11	1	11
11	2	12
11	3	13
12	1	14
12	2	15
12	3	16
12	4	17
12	5	18
2	1	4
2	2	5
2	3	6
2	4	7
2	5	8
21	2	21
21	3	22
21	4	23
22	2	24
22	3	25
22	4	26
22	5	27
22	6	28
31	2	31
31	3	32
31	4	33
32	2	34
32	3	35
32	4	36
32	5	37
32	6	38
drop table tmp;
#
# Delete in stored procedure
#
create procedure sp()
begin
delete from t1 where c1 in (select a.c2 from t1 a where a.c3 = t1.c3)
order by c3 desc limit 1;
end
//
create table tmp as select * from t1
where c1 in (select a.c2 from t1 a where a.c3 = t1.c3)
order by c3 desc limit 1;
CALL sp;
insert into tmp(c1,c2,c3) select * from t1
where c1 in (select a.c2 from t1 a where a.c3 = t1.c3)
order by c3 desc limit 1;
CALL sp;
insert into tmp(c1,c2,c3) select * from t1
where c1 in (select a.c2 from t1 a where a.c3 = t1.c3)
order by c3 desc limit 1;
CALL sp;
select * from t1;
c1	c2	c3
1	2	2
1	3	3
11	1	11
11	2	12
11	3	13
12	1	14
12	2	15
12	3	16
12	4	17
12	5	18
2	1	4
2	3	6
2	4	7
2	5	8
21	2	21
21	3	22
21	4	23
22	2	24
22	3	25
22	4	26
22	5	27
22	6	28
31	2	31
31	3	32
31	4	33
32	2	34
32	3	35
32	4	36
32	5	37
32	6	38
insert into t1(c1,c2,c3) select c1,c2,c3 from tmp;
drop procedure sp;
drop table tmp;
#
# Delete in stored function
#
create function f1(IN a INT) returns int
begin
delete from t1 where c3 < a  order by c3 limit 1;
return  1;
end;//
set @a:=7;
create table tmp as select * from t1 where c3 < @a
order by c3 limit 1;
select f1(@a);
f1(@a)
1
insert into tmp(c1,c2,c3) select * from t1 where c3 < @a
order by c3 limit 1;
select f1(@a);
f1(@a)
1
select * from t1;
c1	c2	c3
1	3	3
11	1	11
11	2	12
11	3	13
12	1	14
12	2	15
12	3	16
12	4	17
12	5	18
2	1	4
2	2	5
2	3	6
2	4	7
2	5	8
21	2	21
21	3	22
21	4	23
22	2	24
22	3	25
22	4	26
22	5	27
22	6	28
31	2	31
31	3	32
31	4	33
32	2	34
32	3	35
32	4	36
32	5	37
32	6	38
insert into t1(c1,c2,c3) select c1,c2,c3 from tmp;
drop function f1;
drop table tmp;
#
# Delete in trigger
#
create table t2 (c1 integer);
insert into t2(c1) values (1), (2), (3), (4), (5), (6), (7), (8);
CREATE TABLE cnt(del integer);
INSERT INTO cnt VALUES(0);
CREATE TRIGGER tr1 AFTER DELETE ON t1 FOR EACH ROW
UPDATE cnt SET del=del+1;
CREATE TRIGGER tr2 AFTER DELETE ON t1 FOR EACH ROW
DELETE FROM t2 WHERE c1> (SELECT count(*)-1 FROM t2);
CREATE TABLE tmp as SELECT * FROM t1 WHERE c2>=3;
DELETE FROM t1 WHERE c2>=3;
affected rows: 20
select * from t1;
c1	c2	c3
1	1	1
1	2	2
11	1	11
11	2	12
12	1	14
12	2	15
2	1	4
2	2	5
21	2	21
22	2	24
31	2	31
32	2	34
SELECT * FROM t2;
c1
SELECT * FROM cnt;
del
20
insert into t1(c1,c2,c3) select c1,c2,c3 from tmp;
DROP TRIGGER tr1;
DROP TRIGGER tr2;
drop table t2, cnt, tmp;
#
# Delete with a reference to view in subquery
#
create table tmp as select * from t1 where t1.c2 in ( select max(a.c2) from v1 a
where a.c1 = t1.c1);
explain select * from t1 where t1.c2 in ( select max(a.c2) from v1 a
where a.c1 = t1.c1);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	32	Using where
2	DEPENDENT SUBQUERY	t1	ref	t1_c2	t1_c2	10	const,test.t1.c1	1	Using index
explain delete from t1 where t1.c2 in ( select max(a.c2) from v1 a
where a.c1 = t1.c1);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	32	Using where
2	DEPENDENT SUBQUERY	t1	ref	t1_c2	t1_c2	10	const,test.t1.c1	1	Using index
analyze delete from t1 where t1.c2 in ( select max(a.c2) from v1 a
where a.c1 = t1.c1);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	r_rows	filtered	r_filtered	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	32	32.00	100.00	25.00	Using where
2	DEPENDENT SUBQUERY	t1	ref	t1_c2	t1_c2	10	const,test.t1.c1	1	1.00	100.00	100.00	Using index
select * from t1;
c1	c2	c3
1	1	1
1	3	3
11	1	11
11	3	13
12	1	14
12	3	16
12	4	17
12	5	18
2	1	4
2	3	6
2	4	7
2	5	8
21	3	22
21	4	23
22	3	25
22	4	26
22	5	27
22	6	28
31	3	32
31	4	33
32	3	35
32	4	36
32	5	37
32	6	38
insert into t1(c1,c2,c3) select c1,c2,c3 from tmp;
drop table tmp;
#
# Delete with EXISTS subquery over the updated table
# in WHERE + non-sargable condition
#
analyze table t1 persistent for all;
Table	Op	Msg_type	Msg_text
test.t1	analyze	status	Engine-independent statistics collected
test.t1	analyze	status	OK
create table tmp as select * from t1 where exists (select 'X' from t1 a where a.c2 = t1.c2) and c2 = 3;
explain select * from t1 where exists (select 'X' from t1 a where a.c2 = t1.c2) and c2 = 3;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ref	t1_c2	t1_c2	5	const	8	
1	PRIMARY	a	ref	t1_c2	t1_c2	5	const	8	Using index; FirstMatch(t1)
explain delete from t1 where exists (select 'X' from t1 a where a.c2 = t1.c2) and c2 = 3;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ref	t1_c2	t1_c2	5	const	8	
1	PRIMARY	a	ref	t1_c2	t1_c2	5	const	8	Using index; FirstMatch(t1)
delete from t1 where exists (select 'X' from t1 a where a.c2 = t1.c2) and c2 = 3;
affected rows: 8
select * from t1;
c1	c2	c3
1	1	1
1	2	2
11	1	11
11	2	12
12	1	14
12	2	15
12	4	17
12	5	18
2	1	4
2	2	5
2	4	7
2	5	8
21	2	21
21	4	23
22	2	24
22	4	26
22	5	27
22	6	28
31	2	31
31	4	33
32	2	34
32	4	36
32	5	37
32	6	38
insert into t1(c1,c2,c3) select c1,c2,c3 from tmp;
drop table tmp;
#
# Delete with order by
#
analyze table t1 persistent for all;
Table	Op	Msg_type	Msg_text
test.t1	analyze	status	Engine-independent statistics collected
test.t1	analyze	status	OK
create table tmp as select * from t1 where exists (select 'X' from t1 a where a.c2 = t1.c2)
and c2 >= 3 order by c2;
explain select * from t1 where exists (select 'X' from t1 a where a.c2 = t1.c2)
and c2 >= 3 order by c2;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	t1_c2	NULL	NULL	NULL	#	Using where; Using filesort
1	PRIMARY	a	ref	t1_c2	t1_c2	5	test.t1.c2	#	Using index; FirstMatch(t1)
explain delete from t1 where exists (select 'X' from t1 a where a.c2 = t1.c2)
and c2 >= 3 order by c2;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	a	index	t1_c2	t1_c2	10	NULL	#	Using where; Using index; LooseScan
1	PRIMARY	t1	ref	t1_c2	t1_c2	5	test.a.c2	#	
analyze delete from t1 where exists (select 'X' from t1 a where a.c2 = t1.c2)
and c2 >= 3 order by c2;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	r_rows	filtered	r_filtered	Extra
1	PRIMARY	a	index	t1_c2	t1_c2	10	NULL	#	16.00	20.00	25.00	Using where; Using index; LooseScan
1	PRIMARY	t1	ref	t1_c2	t1_c2	5	test.a.c2	#	5.00	5.00	100.00	
select * from t1;
c1	c2	c3
1	1	1
1	2	2
11	1	11
11	2	12
12	1	14
12	2	15
2	1	4
2	2	5
21	2	21
22	2	24
31	2	31
32	2	34
insert into t1(c1,c2,c3) select c1,c2,c3 from tmp;
drop table tmp;
#
# Delete from view
#
analyze table t1 persistent for all;
Table	Op	Msg_type	Msg_text
test.t1	analyze	status	Engine-independent statistics collected
test.t1	analyze	status	OK
create table tmp as select * from v1 where v1.c1 in
(select max(a.c1) from t1 a where a.c2 = v1.c2) and c3 = 5;
explain select * from v1 where v1.c1 in
(select max(a.c1) from t1 a where a.c2 = v1.c2) and c3 = 5;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ref	t1_c2	t1_c2	5	const	8	Using where
2	DEPENDENT SUBQUERY	a	ref	t1_c2	t1_c2	5	test.t1.c2	5	Using index
explain delete from v1 where v1.c1 in
(select max(a.c1) from t1 a where a.c2 = v1.c2) and c3 = 5;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ref	t1_c2	t1_c2	5	const	8	Using where
2	DEPENDENT SUBQUERY	a	ref	t1_c2	t1_c2	5	test.t1.c2	5	Using index
delete from v1 where v1.c1 in
(select max(a.c1) from t1 a where a.c2 = v1.c2) and c3 = 5;
affected rows: 0
select * from t1;
c1	c2	c3
1	1	1
1	2	2
1	3	3
11	1	11
11	2	12
11	3	13
12	1	14
12	2	15
12	3	16
12	4	17
12	5	18
2	1	4
2	2	5
2	3	6
2	4	7
2	5	8
21	2	21
21	3	22
21	4	23
22	2	24
22	3	25
22	4	26
22	5	27
22	6	28
31	2	31
31	3	32
31	4	33
32	2	34
32	3	35
32	4	36
32	5	37
32	6	38
insert into t1(c1,c2,c3) select c1,c2,c3 from tmp;
drop table tmp;
#
# Delete from view using reference
# to the same view in subquery
#
analyze table t1 persistent for all;
Table	Op	Msg_type	Msg_text
test.t1	analyze	status	Engine-independent statistics collected
test.t1	analyze	status	Table is already up to date
create table tmp as select * from v1 where v1.c2 in (select max(a.c2) from t1 a where a.c3 = v1.c3)
and c1 = 2
and exists (select 'X' from v1 a where a.c1 = v1.c1);
explain select * from v1 where v1.c2 in (select max(a.c2) from t1 a where a.c3 = v1.c3)
and c1 = 2
and exists (select 'X' from v1 a where a.c1 = v1.c1);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ref	t1_c2	t1_c2	10	const,const	#	Using where
1	PRIMARY	t1	ref	t1_c2	t1_c2	10	const,const	#	Using index; FirstMatch(t1)
2	DEPENDENT SUBQUERY	a	ALL	NULL	NULL	NULL	NULL	#	Using where
explain delete from v1 where v1.c2 in (select max(a.c2) from t1 a where a.c3 = v1.c3)
and c1 = 2
and exists (select 'X' from v1 a where a.c1 = v1.c1);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ref	t1_c2	t1_c2	10	const,const	#	Using where
3	DEPENDENT SUBQUERY	t1	ref	t1_c2	t1_c2	10	const,func	#	Using where; Using index
2	DEPENDENT SUBQUERY	a	ALL	NULL	NULL	NULL	NULL	#	Using where
analyze delete from v1 where v1.c2 in (select max(a.c2) from t1 a where a.c3 = v1.c3)
and c1 = 2
and exists (select 'X' from v1 a where a.c1 = v1.c1);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	r_rows	filtered	r_filtered	Extra
1	PRIMARY	t1	ref	t1_c2	t1_c2	10	const,const	#	1.00	100.00	100.00	Using where
3	DEPENDENT SUBQUERY	t1	ref	t1_c2	t1_c2	10	const,func	#	1.00	100.00	100.00	Using where; Using index
2	DEPENDENT SUBQUERY	a	ALL	NULL	NULL	NULL	NULL	#	32.00	100.00	3.12	Using where
select * from t1;
c1	c2	c3
1	1	1
1	2	2
1	3	3
11	1	11
11	2	12
11	3	13
12	1	14
12	2	15
12	3	16
12	4	17
12	5	18
2	1	4
2	3	6
2	4	7
2	5	8
21	2	21
21	3	22
21	4	23
22	2	24
22	3	25
22	4	26
22	5	27
22	6	28
31	2	31
31	3	32
31	4	33
32	2	34
32	3	35
32	4	36
32	5	37
32	6	38
insert into t1(c1,c2,c3) select c1,c2,c3 from tmp;
drop table tmp;
#######################################
#       Test with a primary key       #
#######################################
drop index t1_c2 on t1;
alter table t1 add primary key (c3);
#
# Delete with value from subquery on the same table
#
analyze table t1 persistent for all;
Table	Op	Msg_type	Msg_text
test.t1	analyze	status	Engine-independent statistics collected
test.t1	analyze	status	OK
create table tmp as select * from t1 where c1=(select a.c3 from t1 a where a.c3 = t1.c3);
explain select * from t1 where c1=(select a.c3 from t1 a where a.c3 = t1.c3);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	32	Using where
2	DEPENDENT SUBQUERY	a	eq_ref	PRIMARY	PRIMARY	4	test.t1.c3	1	Using index
explain delete from t1 where c1=(select a.c3 from t1 a where a.c3 = t1.c3);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	32	Using where
2	DEPENDENT SUBQUERY	a	eq_ref	PRIMARY	PRIMARY	4	test.t1.c3	1	Using index
delete from t1 where c1=(select a.c3 from t1 a where a.c3 = t1.c3);
affected rows: 4
select * from t1;
c1	c2	c3
1	2	2
1	3	3
11	2	12
11	3	13
12	1	14
12	2	15
12	3	16
12	4	17
12	5	18
2	1	4
2	2	5
2	3	6
2	4	7
2	5	8
21	3	22
21	4	23
22	2	24
22	3	25
22	4	26
22	5	27
22	6	28
31	3	32
31	4	33
32	2	34
32	3	35
32	4	36
32	5	37
32	6	38
insert into t1(c1,c2,c3) select c1,c2,c3 from tmp;
drop table tmp;
#
# Delete with EXISTS subquery over the updated table
# in WHERE + possibly sargable condition
#
analyze table t1 persistent for all;
Table	Op	Msg_type	Msg_text
test.t1	analyze	status	Engine-independent statistics collected
test.t1	analyze	status	OK
create table tmp as select * from t1 where c1 = 1 and exists (select 'X' from t1 a where a.c1 = t1.c2);
explain select * from t1 where c1 = 1 and exists (select 'X' from t1 a where a.c1 = t1.c2);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	32	Using where
1	PRIMARY	a	ALL	NULL	NULL	NULL	NULL	32	Using where; FirstMatch(t1); Using join buffer (flat, BNL join)
explain delete from t1 where c1 = 1 and exists (select 'X' from t1 a where a.c1 = t1.c2);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	32	Using where
1	PRIMARY	a	ALL	NULL	NULL	NULL	NULL	32	Using where; FirstMatch(t1)
analyze delete from t1 where c1 = 1 and exists (select 'X' from t1 a where a.c1 = t1.c2);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	r_rows	filtered	r_filtered	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	32	32.00	9.38	9.38	Using where
1	PRIMARY	a	ALL	NULL	NULL	NULL	NULL	32	13.33	3.12	5.00	Using where; FirstMatch(t1)
select * from t1;
c1	c2	c3
1	3	3
11	1	11
11	2	12
11	3	13
12	1	14
12	2	15
12	3	16
12	4	17
12	5	18
2	1	4
2	2	5
2	3	6
2	4	7
2	5	8
21	2	21
21	3	22
21	4	23
22	2	24
22	3	25
22	4	26
22	5	27
22	6	28
31	2	31
31	3	32
31	4	33
32	2	34
32	3	35
32	4	36
32	5	37
32	6	38
insert into t1(c1,c2,c3) select c1,c2,c3 from tmp;
drop table tmp;
#
# Delete with IN predicand over the updated table in WHERE
#
create table tmp as select * from t1 where c3 in (select distinct a.c1 from t1 a where t1.c2=a.c2);
explain select * from t1 where c3 in (select distinct a.c1 from t1 a where t1.c2=a.c2);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	a	ALL	NULL	NULL	NULL	NULL	32	Using where; Start temporary
1	PRIMARY	t1	eq_ref	PRIMARY	PRIMARY	4	test.a.c1	1	Using where; End temporary
explain delete from t1 where c3 in (select distinct a.c1 from t1 a where t1.c2=a.c2);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	a	ALL	NULL	NULL	NULL	NULL	32	Using where; Start temporary
1	PRIMARY	t1	eq_ref	PRIMARY	PRIMARY	4	test.a.c1	1	Using where; End temporary
delete from t1 where c3 in (select distinct a.c1 from t1 a where t1.c2=a.c2);
affected rows: 8
select * from t1;
c1	c2	c3
1	3	3
11	3	13
12	1	14
12	2	15
12	3	16
12	4	17
12	5	18
2	1	4
2	2	5
2	3	6
2	4	7
2	5	8
21	4	23
22	2	24
22	3	25
22	4	26
22	5	27
22	6	28
31	4	33
32	2	34
32	3	35
32	4	36
32	5	37
32	6	38
insert into t1(c1,c2,c3) select c1,c2,c3 from tmp;
drop table tmp;
#
# Delete with a limit - can be deleted
#
create table tmp as select * from t1 where c1 in (select a.c2 from t1 a where a.c2 = t1.c3) limit 1;
explain select * from t1 where c1 in (select a.c2 from t1 a where a.c2 = t1.c3) limit 1;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	a	ALL	NULL	NULL	NULL	NULL	32	Using where; Start temporary
1	PRIMARY	t1	eq_ref	PRIMARY	PRIMARY	4	test.a.c2	1	Using where; End temporary
explain delete from t1 where c1 in (select a.c2 from t1 a where a.c2 = t1.c3) limit 1;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	a	ALL	NULL	NULL	NULL	NULL	32	Using where; Start temporary
1	PRIMARY	t1	eq_ref	PRIMARY	PRIMARY	4	test.a.c2	1	Using where; End temporary
analyze delete from t1 where c1 in (select a.c2 from t1 a where a.c2 = t1.c3) limit 1;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	r_rows	filtered	r_filtered	Extra
1	PRIMARY	a	ALL	NULL	NULL	NULL	NULL	32	4.00	100.00	100.00	Using where; Start temporary
1	PRIMARY	t1	eq_ref	PRIMARY	PRIMARY	4	test.a.c2	1	1.00	3.12	25.00	Using where; End temporary
select * from t1;
c1	c2	c3
1	2	2
1	3	3
11	1	11
11	2	12
11	3	13
12	1	14
12	2	15
12	3	16
12	4	17
12	5	18
2	1	4
2	2	5
2	3	6
2	4	7
2	5	8
21	2	21
21	3	22
21	4	23
22	2	24
22	3	25
22	4	26
22	5	27
22	6	28
31	2	31
31	3	32
31	4	33
32	2	34
32	3	35
32	4	36
32	5	37
32	6	38
insert into t1(c1,c2,c3) select c1,c2,c3 from tmp;
drop table tmp;
#
# Delete with a limit and an order by
#
create table tmp as select * from t1 where c1 in (select a.c2 from t1 a where a.c3 = t1.c3)
order by c3 desc limit 1;
explain select * from t1 where c1 in (select a.c2 from t1 a where a.c3 = t1.c3)
order by c3 desc limit 1;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	index	PRIMARY	PRIMARY	4	NULL	1	
1	PRIMARY	a	eq_ref	PRIMARY	PRIMARY	4	test.t1.c3	1	Using where
explain delete from t1 where c1 in (select a.c2 from t1 a where a.c3 = t1.c3)
order by c3 desc limit 1;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	index	NULL	PRIMARY	4	NULL	1	Using where
2	DEPENDENT SUBQUERY	a	eq_ref	PRIMARY	PRIMARY	4	test.t1.c3	1	Using where
delete from t1 where c1 in (select a.c2 from t1 a where a.c3 = t1.c3)
order by c3 desc limit 1;
affected rows: 1
select * from t1;
c1	c2	c3
1	1	1
1	2	2
1	3	3
11	1	11
11	2	12
11	3	13
12	1	14
12	2	15
12	3	16
12	4	17
12	5	18
2	1	4
2	3	6
2	4	7
2	5	8
21	2	21
21	3	22
21	4	23
22	2	24
22	3	25
22	4	26
22	5	27
22	6	28
31	2	31
31	3	32
31	4	33
32	2	34
32	3	35
32	4	36
32	5	37
32	6	38
insert into t1(c1,c2,c3) select c1,c2,c3 from tmp;
drop table tmp;
#
# Delete: 2 execution of PS
#
prepare create_tmp_stmt from
"create table tmp as select * from t1
      where c2=(select a.c3 from t1 a where a.c3 = ?)";
prepare delete_t1_stmt from
"delete from t1 where c2=(select a.c3 from t1 a where a.c3 = ?)";
set @a:=5;
execute create_tmp_stmt using @a;
execute delete_t1_stmt using @a;
execute delete_t1_stmt using @a;
select * from t1;
c1	c2	c3
1	1	1
1	2	2
1	3	3
11	1	11
11	2	12
11	3	13
12	1	14
12	2	15
12	3	16
12	4	17
2	1	4
2	2	5
2	3	6
2	4	7
21	2	21
21	3	22
21	4	23
22	2	24
22	3	25
22	4	26
22	6	28
31	2	31
31	3	32
31	4	33
32	2	34
32	3	35
32	4	36
32	6	38
prepare insert_tmp_stmt from
"insert into tmp(c1,c2,c3) select * from t1
      where c2=(select a.c3 from t1 a where a.c3 = ?)";
set @a:=2;
execute insert_tmp_stmt using @a;
execute delete_t1_stmt using @a;
select * from t1;
c1	c2	c3
1	1	1
1	3	3
11	1	11
11	3	13
12	1	14
12	3	16
12	4	17
2	1	4
2	3	6
2	4	7
21	3	22
21	4	23
22	3	25
22	4	26
22	6	28
31	3	32
31	4	33
32	3	35
32	4	36
32	6	38
insert into t1(c1,c2,c3) select c1,c2,c3 from tmp;
select * from t1;
c1	c2	c3
1	1	1
1	2	2
1	3	3
11	1	11
11	2	12
11	3	13
12	1	14
12	2	15
12	3	16
12	4	17
12	5	18
2	1	4
2	2	5
2	3	6
2	4	7
2	5	8
21	2	21
21	3	22
21	4	23
22	2	24
22	3	25
22	4	26
22	5	27
22	6	28
31	2	31
31	3	32
31	4	33
32	2	34
32	3	35
32	4	36
32	5	37
32	6	38
drop table tmp;
#
# Delete in stored procedure
#
create procedure sp()
begin
delete from t1 where c1 in (select a.c2 from t1 a where a.c3 = t1.c3)
order by c3 desc limit 1;
end
//
create table tmp as select * from t1
where c1 in (select a.c2 from t1 a where a.c3 = t1.c3)
order by c3 desc limit 1;
CALL sp;
insert into tmp(c1,c2,c3) select * from t1
where c1 in (select a.c2 from t1 a where a.c3 = t1.c3)
order by c3 desc limit 1;
CALL sp;
insert into tmp(c1,c2,c3) select * from t1
where c1 in (select a.c2 from t1 a where a.c3 = t1.c3)
order by c3 desc limit 1;
CALL sp;
select * from t1;
c1	c2	c3
1	2	2
1	3	3
11	1	11
11	2	12
11	3	13
12	1	14
12	2	15
12	3	16
12	4	17
12	5	18
2	1	4
2	3	6
2	4	7
2	5	8
21	2	21
21	3	22
21	4	23
22	2	24
22	3	25
22	4	26
22	5	27
22	6	28
31	2	31
31	3	32
31	4	33
32	2	34
32	3	35
32	4	36
32	5	37
32	6	38
insert into t1(c1,c2,c3) select c1,c2,c3 from tmp;
drop procedure sp;
drop table tmp;
#
# Delete in stored function
#
create function f1(IN a INT) returns int
begin
delete from t1 where c3 < a  order by c3 limit 1;
return  1;
end;//
set @a:=7;
create table tmp as select * from t1 where c3 < @a
order by c3 limit 1;
select f1(@a);
f1(@a)
1
insert into tmp(c1,c2,c3) select * from t1 where c3 < @a
order by c3 limit 1;
select f1(@a);
f1(@a)
1
select * from t1;
c1	c2	c3
1	3	3
11	1	11
11	2	12
11	3	13
12	1	14
12	2	15
12	3	16
12	4	17
12	5	18
2	1	4
2	2	5
2	3	6
2	4	7
2	5	8
21	2	21
21	3	22
21	4	23
22	2	24
22	3	25
22	4	26
22	5	27
22	6	28
31	2	31
31	3	32
31	4	33
32	2	34
32	3	35
32	4	36
32	5	37
32	6	38
insert into t1(c1,c2,c3) select c1,c2,c3 from tmp;
drop function f1;
drop table tmp;
#
# Delete in trigger
#
create table t2 (c1 integer);
insert into t2(c1) values (1), (2), (3), (4), (5), (6), (7), (8);
CREATE TABLE cnt(del integer);
INSERT INTO cnt VALUES(0);
CREATE TRIGGER tr1 AFTER DELETE ON t1 FOR EACH ROW
UPDATE cnt SET del=del+1;
CREATE TRIGGER tr2 AFTER DELETE ON t1 FOR EACH ROW
DELETE FROM t2 WHERE c1> (SELECT count(*)-1 FROM t2);
CREATE TABLE tmp as SELECT * FROM t1 WHERE c2>=3;
DELETE FROM t1 WHERE c2>=3;
affected rows: 20
select * from t1;
c1	c2	c3
1	1	1
1	2	2
11	1	11
11	2	12
12	1	14
12	2	15
2	1	4
2	2	5
21	2	21
22	2	24
31	2	31
32	2	34
SELECT * FROM t2;
c1
SELECT * FROM cnt;
del
20
insert into t1(c1,c2,c3) select c1,c2,c3 from tmp;
DROP TRIGGER tr1;
DROP TRIGGER tr2;
drop table t2, cnt, tmp;
#
# Delete with a reference to view in subquery
#
create table tmp as select * from t1 where t1.c2 in ( select max(a.c2) from v1 a
where a.c1 = t1.c1);
explain select * from t1 where t1.c2 in ( select max(a.c2) from v1 a
where a.c1 = t1.c1);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	32	Using where
2	DEPENDENT SUBQUERY	t1	ALL	NULL	NULL	NULL	NULL	32	Using where
explain delete from t1 where t1.c2 in ( select max(a.c2) from v1 a
where a.c1 = t1.c1);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	32	Using where
2	DEPENDENT SUBQUERY	t1	ALL	NULL	NULL	NULL	NULL	32	Using where
analyze delete from t1 where t1.c2 in ( select max(a.c2) from v1 a
where a.c1 = t1.c1);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	r_rows	filtered	r_filtered	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	32	32.00	100.00	25.00	Using where
2	DEPENDENT SUBQUERY	t1	ALL	NULL	NULL	NULL	NULL	32	32.00	25.00	3.12	Using where
select * from t1;
c1	c2	c3
1	1	1
1	3	3
11	1	11
11	3	13
12	1	14
12	3	16
12	4	17
12	5	18
2	1	4
2	3	6
2	4	7
2	5	8
21	3	22
21	4	23
22	3	25
22	4	26
22	5	27
22	6	28
31	3	32
31	4	33
32	3	35
32	4	36
32	5	37
32	6	38
insert into t1(c1,c2,c3) select c1,c2,c3 from tmp;
drop table tmp;
#
# Delete with EXISTS subquery over the updated table
# in WHERE + non-sargable condition
#
analyze table t1 persistent for all;
Table	Op	Msg_type	Msg_text
test.t1	analyze	status	Engine-independent statistics collected
test.t1	analyze	status	OK
create table tmp as select * from t1 where exists (select 'X' from t1 a where a.c2 = t1.c2) and c2 = 3;
explain select * from t1 where exists (select 'X' from t1 a where a.c2 = t1.c2) and c2 = 3;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	32	Using where
1	PRIMARY	a	ALL	NULL	NULL	NULL	NULL	32	Using where; FirstMatch(t1); Using join buffer (flat, BNL join)
explain delete from t1 where exists (select 'X' from t1 a where a.c2 = t1.c2) and c2 = 3;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	32	Using where
1	PRIMARY	a	ALL	NULL	NULL	NULL	NULL	32	Using where; FirstMatch(t1)
delete from t1 where exists (select 'X' from t1 a where a.c2 = t1.c2) and c2 = 3;
affected rows: 8
select * from t1;
c1	c2	c3
1	1	1
1	2	2
11	1	11
11	2	12
12	1	14
12	2	15
12	4	17
12	5	18
2	1	4
2	2	5
2	4	7
2	5	8
21	2	21
21	4	23
22	2	24
22	4	26
22	5	27
22	6	28
31	2	31
31	4	33
32	2	34
32	4	36
32	5	37
32	6	38
insert into t1(c1,c2,c3) select c1,c2,c3 from tmp;
drop table tmp;
#
# Delete with order by
#
analyze table t1 persistent for all;
Table	Op	Msg_type	Msg_text
test.t1	analyze	status	Engine-independent statistics collected
test.t1	analyze	status	OK
create table tmp as select * from t1 where exists (select 'X' from t1 a where a.c2 = t1.c2)
and c2 >= 3 order by c2;
explain select * from t1 where exists (select 'X' from t1 a where a.c2 = t1.c2)
and c2 >= 3 order by c2;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	#	Using where; Using filesort
1	PRIMARY	<subquery2>	eq_ref	distinct_key	distinct_key	4	func	#	
2	MATERIALIZED	a	ALL	NULL	NULL	NULL	NULL	#	
explain delete from t1 where exists (select 'X' from t1 a where a.c2 = t1.c2)
and c2 >= 3 order by c2;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	#	Using where
1	PRIMARY	<subquery2>	eq_ref	distinct_key	distinct_key	4	func	#	
2	MATERIALIZED	a	ALL	NULL	NULL	NULL	NULL	#	
analyze delete from t1 where exists (select 'X' from t1 a where a.c2 = t1.c2)
and c2 >= 3 order by c2;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	r_rows	filtered	r_filtered	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	#	32.00	62.50	62.50	Using where
1	PRIMARY	<subquery2>	eq_ref	distinct_key	distinct_key	4	func	#	1.00	100.00	100.00	
2	MATERIALIZED	a	ALL	NULL	NULL	NULL	NULL	#	32.00	62.50	100.00	
select * from t1;
c1	c2	c3
1	1	1
1	2	2
11	1	11
11	2	12
12	1	14
12	2	15
2	1	4
2	2	5
21	2	21
22	2	24
31	2	31
32	2	34
insert into t1(c1,c2,c3) select c1,c2,c3 from tmp;
drop table tmp;
#
# Delete from view
#
analyze table t1 persistent for all;
Table	Op	Msg_type	Msg_text
test.t1	analyze	status	Engine-independent statistics collected
test.t1	analyze	status	OK
create table tmp as select * from v1 where v1.c1 in
(select max(a.c1) from t1 a where a.c2 = v1.c2) and c3 = 5;
explain select * from v1 where v1.c1 in
(select max(a.c1) from t1 a where a.c2 = v1.c2) and c3 = 5;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	const	PRIMARY	PRIMARY	4	const	1	
2	DEPENDENT SUBQUERY	a	ALL	NULL	NULL	NULL	NULL	32	Using where
explain delete from v1 where v1.c1 in
(select max(a.c1) from t1 a where a.c2 = v1.c2) and c3 = 5;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	const	PRIMARY	PRIMARY	4	const	1	
2	DEPENDENT SUBQUERY	a	ALL	NULL	NULL	NULL	NULL	32	Using where
delete from v1 where v1.c1 in
(select max(a.c1) from t1 a where a.c2 = v1.c2) and c3 = 5;
affected rows: 0
select * from t1;
c1	c2	c3
1	1	1
1	2	2
1	3	3
11	1	11
11	2	12
11	3	13
12	1	14
12	2	15
12	3	16
12	4	17
12	5	18
2	1	4
2	2	5
2	3	6
2	4	7
2	5	8
21	2	21
21	3	22
21	4	23
22	2	24
22	3	25
22	4	26
22	5	27
22	6	28
31	2	31
31	3	32
31	4	33
32	2	34
32	3	35
32	4	36
32	5	37
32	6	38
insert into t1(c1,c2,c3) select c1,c2,c3 from tmp;
drop table tmp;
#
# Delete from view using reference
# to the same view in subquery
#
analyze table t1 persistent for all;
Table	Op	Msg_type	Msg_text
test.t1	analyze	status	Engine-independent statistics collected
test.t1	analyze	status	Table is already up to date
create table tmp as select * from v1 where v1.c2 in (select max(a.c2) from t1 a where a.c3 = v1.c3)
and c1 = 2
and exists (select 'X' from v1 a where a.c1 = v1.c1);
explain select * from v1 where v1.c2 in (select max(a.c2) from t1 a where a.c3 = v1.c3)
and c1 = 2
and exists (select 'X' from v1 a where a.c1 = v1.c1);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	#	Using where
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	#	Using where; FirstMatch(t1); Using join buffer (flat, BNL join)
2	DEPENDENT SUBQUERY	a	eq_ref	PRIMARY	PRIMARY	4	test.t1.c3	#	
explain delete from v1 where v1.c2 in (select max(a.c2) from t1 a where a.c3 = v1.c3)
and c1 = 2
and exists (select 'X' from v1 a where a.c1 = v1.c1);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	#	Using where
3	DEPENDENT SUBQUERY	t1	ALL	NULL	NULL	NULL	NULL	#	Using where
2	DEPENDENT SUBQUERY	a	eq_ref	PRIMARY	PRIMARY	4	test.t1.c3	#	
analyze delete from v1 where v1.c2 in (select max(a.c2) from t1 a where a.c3 = v1.c3)
and c1 = 2
and exists (select 'X' from v1 a where a.c1 = v1.c1);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	r_rows	filtered	r_filtered	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	#	32.00	3.91	3.12	Using where
3	DEPENDENT SUBQUERY	t1	ALL	NULL	NULL	NULL	NULL	#	3.00	25.00	33.33	Using where
2	DEPENDENT SUBQUERY	a	eq_ref	PRIMARY	PRIMARY	4	test.t1.c3	#	1.00	100.00	100.00	
select * from t1;
c1	c2	c3
1	1	1
1	2	2
1	3	3
11	1	11
11	2	12
11	3	13
12	1	14
12	2	15
12	3	16
12	4	17
12	5	18
2	1	4
2	3	6
2	4	7
2	5	8
21	2	21
21	3	22
21	4	23
22	2	24
22	3	25
22	4	26
22	5	27
22	6	28
31	2	31
31	3	32
31	4	33
32	2	34
32	3	35
32	4	36
32	5	37
32	6	38
insert into t1(c1,c2,c3) select c1,c2,c3 from tmp;
drop table tmp;
drop view v1;
drop table t1;
#
# Test on dynamic columns (blob)
#
create table assets (
item_name varchar(32) primary key, -- A common attribute for all items
dynamic_cols  blob  -- Dynamic columns will be stored here
);
INSERT INTO assets
VALUES ('MariaDB T-shirt',
COLUMN_CREATE('color', 'blue', 'size', 'XL'));
INSERT INTO assets
VALUES ('Thinkpad Laptop',
COLUMN_CREATE('color', 'black', 'price', 500));
INSERT INTO assets
VALUES ('Fridge',
COLUMN_CREATE('color', 'white', 'warranty', '5 years'));
INSERT INTO assets
VALUES ('Microwave',
COLUMN_CREATE('warranty', '3 years'));
SELECT item_name, COLUMN_GET(dynamic_cols, 'color' as char) AS color
FROM assets ORDER BY item_name;
item_name	color
Fridge	white
MariaDB T-shirt	blue
Microwave	NULL
Thinkpad Laptop	black
UPDATE assets SET dynamic_cols=COLUMN_DELETE(dynamic_cols, 'color')
WHERE item_name='Fridge';
SELECT item_name, COLUMN_GET(dynamic_cols, 'color' as char) AS color
FROM assets ORDER BY item_name;
item_name	color
Fridge	NULL
MariaDB T-shirt	blue
Microwave	NULL
Thinkpad Laptop	black
DELETE FROM assets
WHERE item_name in
(select b.item_name from assets b
where COLUMN_GET(b.dynamic_cols, 'color' as char) ='black');
SELECT item_name, COLUMN_GET(dynamic_cols, 'color' as char) AS color
FROM assets ORDER BY item_name;
item_name	color
Fridge	NULL
MariaDB T-shirt	blue
Microwave	NULL
DELETE FROM assets WHERE item_name='Microwave';
SELECT item_name, COLUMN_GET(dynamic_cols, 'color' as char) AS color
FROM assets ORDER BY item_name;
item_name	color
Fridge	NULL
MariaDB T-shirt	blue
drop table assets ;
#
# Test on fulltext columns
#
CREATE TABLE ft2(copy TEXT,FULLTEXT(copy));
INSERT INTO ft2(copy) VALUES
('MySQL vs MariaDB database'),
('Oracle vs MariaDB database'),
('PostgreSQL vs MariaDB database'),
('MariaDB overview'),
('Foreign keys'),
('Primary keys'),
('Indexes'),
('Transactions'),
('Triggers');
SELECT * FROM ft2 WHERE MATCH(copy) AGAINST('database');
copy
MySQL vs MariaDB database
Oracle vs MariaDB database
PostgreSQL vs MariaDB database
DELETE FROM ft2 WHERE  MATCH(copy) AGAINST('database');
SELECT * FROM ft2 WHERE MATCH(copy) AGAINST('database');
copy
drop table ft2;
#######################################
#                                     #
#            Engine MEMORY            #
#                                     #
#######################################
set default_storage_engine=MEMORY;
create table t1 (c1 integer, c2 integer, c3 integer);
insert into t1(c1,c2,c3)
values (1,1,1),(1,2,2),(1,3,3),
(2,1,4),(2,2,5),(2,3,6),
(2,4,7),(2,5,8);
insert into t1 select c1+10,c2,c3+10 from t1;
insert into t1 select c1+20,c2+1,c3+20 from t1;
analyze table t1 persistent for all;
Table	Op	Msg_type	Msg_text
test.t1	analyze	status	Engine-independent statistics collected
test.t1	analyze	note	The storage engine for the table doesn't support analyze
create view v1 as select * from t1 where c2=2;
#######################################
#        Test without any index       #
#######################################
#
# Delete with value from subquery on the same table
#
analyze table t1 persistent for all;
Table	Op	Msg_type	Msg_text
test.t1	analyze	status	Engine-independent statistics collected
test.t1	analyze	note	The storage engine for the table doesn't support analyze
create table tmp as select * from t1 where c1=(select a.c3 from t1 a where a.c3 = t1.c3);
explain select * from t1 where c1=(select a.c3 from t1 a where a.c3 = t1.c3);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	32	Using where
2	DEPENDENT SUBQUERY	a	ALL	NULL	NULL	NULL	NULL	32	Using where
explain delete from t1 where c1=(select a.c3 from t1 a where a.c3 = t1.c3);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	32	Using where
2	DEPENDENT SUBQUERY	a	ALL	NULL	NULL	NULL	NULL	32	Using where
delete from t1 where c1=(select a.c3 from t1 a where a.c3 = t1.c3);
affected rows: 4
select * from t1;
c1	c2	c3
1	2	2
1	3	3
11	2	12
11	3	13
12	1	14
12	2	15
12	3	16
12	4	17
12	5	18
2	1	4
2	2	5
2	3	6
2	4	7
2	5	8
21	3	22
21	4	23
22	2	24
22	3	25
22	4	26
22	5	27
22	6	28
31	3	32
31	4	33
32	2	34
32	3	35
32	4	36
32	5	37
32	6	38
insert into t1(c1,c2,c3) select c1,c2,c3 from tmp;
drop table tmp;
#
# Delete with EXISTS subquery over the updated table
# in WHERE + possibly sargable condition
#
analyze table t1 persistent for all;
Table	Op	Msg_type	Msg_text
test.t1	analyze	status	Engine-independent statistics collected
test.t1	analyze	note	The storage engine for the table doesn't support analyze
create table tmp as select * from t1 where c1 = 1 and exists (select 'X' from t1 a where a.c1 = t1.c2);
explain select * from t1 where c1 = 1 and exists (select 'X' from t1 a where a.c1 = t1.c2);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	32	Using where
1	PRIMARY	a	ALL	NULL	NULL	NULL	NULL	32	Using where; FirstMatch(t1); Using join buffer (flat, BNL join)
explain delete from t1 where c1 = 1 and exists (select 'X' from t1 a where a.c1 = t1.c2);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	32	Using where
1	PRIMARY	a	ALL	NULL	NULL	NULL	NULL	32	Using where; FirstMatch(t1)
delete from t1 where c1 = 1 and exists (select 'X' from t1 a where a.c1 = t1.c2);
affected rows: 2
select * from t1;
c1	c2	c3
1	3	3
11	1	11
11	2	12
11	3	13
12	1	14
12	2	15
12	3	16
12	4	17
12	5	18
2	1	4
2	2	5
2	3	6
2	4	7
2	5	8
21	2	21
21	3	22
21	4	23
22	2	24
22	3	25
22	4	26
22	5	27
22	6	28
31	2	31
31	3	32
31	4	33
32	2	34
32	3	35
32	4	36
32	5	37
32	6	38
insert into t1(c1,c2,c3) select c1,c2,c3 from tmp;
drop table tmp;
#
# Delete with EXISTS subquery over the updated table
# in WHERE + non-sargable condition
#
analyze table t1 persistent for all;
Table	Op	Msg_type	Msg_text
test.t1	analyze	status	Engine-independent statistics collected
test.t1	analyze	note	The storage engine for the table doesn't support analyze
create table tmp as select * from t1 where exists (select 'X' from t1 a where a.c2 = t1.c2) and c2 = 3;
explain select * from t1 where exists (select 'X' from t1 a where a.c2 = t1.c2) and c2 = 3;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	32	Using where
1	PRIMARY	a	ALL	NULL	NULL	NULL	NULL	32	Using where; FirstMatch(t1); Using join buffer (flat, BNL join)
explain delete from t1 where exists (select 'X' from t1 a where a.c2 = t1.c2) and c2 = 3;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	32	Using where
1	PRIMARY	a	ALL	NULL	NULL	NULL	NULL	32	Using where; FirstMatch(t1)
delete from t1 where exists (select 'X' from t1 a where a.c2 = t1.c2) and c2 = 3;
affected rows: 8
select * from t1;
c1	c2	c3
1	1	1
1	2	2
11	1	11
11	2	12
12	1	14
12	2	15
12	4	17
12	5	18
2	1	4
2	2	5
2	4	7
2	5	8
21	2	21
21	4	23
22	2	24
22	4	26
22	5	27
22	6	28
31	2	31
31	4	33
32	2	34
32	4	36
32	5	37
32	6	38
insert into t1(c1,c2,c3) select c1,c2,c3 from tmp;
drop table tmp;
#
# Delete with order by
#
analyze table t1 persistent for all;
Table	Op	Msg_type	Msg_text
test.t1	analyze	status	Engine-independent statistics collected
test.t1	analyze	note	The storage engine for the table doesn't support analyze
create table tmp as select * from t1 where exists (select 'X' from t1 a where a.c2 = t1.c2)
and c2 >= 3 order by c2;
explain select * from t1 where exists (select 'X' from t1 a where a.c2 = t1.c2)
and c2 >= 3 order by c2;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	32	Using where; Using filesort
1	PRIMARY	<subquery2>	eq_ref	distinct_key	distinct_key	4	func	1	
2	MATERIALIZED	a	ALL	NULL	NULL	NULL	NULL	32	
explain delete from t1 where exists (select 'X' from t1 a where a.c2 = t1.c2)
and c2 >= 3 order by c2;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	32	Using where
1	PRIMARY	<subquery2>	eq_ref	distinct_key	distinct_key	4	func	1	
2	MATERIALIZED	a	ALL	NULL	NULL	NULL	NULL	32	
delete from t1 where exists (select 'X' from t1 a where a.c2 = t1.c2)
and c2 >= 3 order by c2;
affected rows: 20
select * from t1;
c1	c2	c3
1	1	1
1	2	2
11	1	11
11	2	12
12	1	14
12	2	15
2	1	4
2	2	5
21	2	21
22	2	24
31	2	31
32	2	34
insert into t1(c1,c2,c3) select c1,c2,c3 from tmp;
drop table tmp;
#
# Delete with IN predicand over the updated table in WHERE
#
create table tmp as select * from t1 where c3 in (select distinct a.c1 from t1 a where t1.c2=a.c2);
explain select * from t1 where c3 in (select distinct a.c1 from t1 a where t1.c2=a.c2);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	32	
1	PRIMARY	a	ALL	NULL	NULL	NULL	NULL	32	Using where; FirstMatch(t1); Using join buffer (flat, BNL join)
explain delete from t1 where c3 in (select distinct a.c1 from t1 a where t1.c2=a.c2);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	32	
1	PRIMARY	a	ALL	NULL	NULL	NULL	NULL	32	Using where; FirstMatch(t1)
delete from t1 where c3 in (select distinct a.c1 from t1 a where t1.c2=a.c2);
affected rows: 8
select * from t1;
c1	c2	c3
1	3	3
11	3	13
12	1	14
12	2	15
12	3	16
12	4	17
12	5	18
2	1	4
2	2	5
2	3	6
2	4	7
2	5	8
21	4	23
22	2	24
22	3	25
22	4	26
22	5	27
22	6	28
31	4	33
32	2	34
32	3	35
32	4	36
32	5	37
32	6	38
insert into t1(c1,c2,c3) select c1,c2,c3 from tmp;
drop table tmp;
#
# Delete with a limit - can be deleted
#
create table tmp as select * from t1 where c1 in (select a.c2 from t1 a where a.c2 = t1.c3) limit 1;
explain select * from t1 where c1 in (select a.c2 from t1 a where a.c2 = t1.c3) limit 1;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	32	Using where
1	PRIMARY	a	ALL	NULL	NULL	NULL	NULL	32	Using where; FirstMatch(t1); Using join buffer (flat, BNL join)
explain delete from t1 where c1 in (select a.c2 from t1 a where a.c2 = t1.c3) limit 1;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	32	Using where
1	PRIMARY	a	ALL	NULL	NULL	NULL	NULL	32	Using where; FirstMatch(t1)
delete from t1 where c1 in (select a.c2 from t1 a where a.c2 = t1.c3) limit 1;
affected rows: 1
select * from t1;
c1	c2	c3
1	2	2
1	3	3
11	1	11
11	2	12
11	3	13
12	1	14
12	2	15
12	3	16
12	4	17
12	5	18
2	1	4
2	2	5
2	3	6
2	4	7
2	5	8
21	2	21
21	3	22
21	4	23
22	2	24
22	3	25
22	4	26
22	5	27
22	6	28
31	2	31
31	3	32
31	4	33
32	2	34
32	3	35
32	4	36
32	5	37
32	6	38
insert into t1(c1,c2,c3) select c1,c2,c3 from tmp;
drop table tmp;
#
# Delete with a limit and an order by
#
create table tmp as select * from t1 where c1 in (select a.c2 from t1 a where a.c3 = t1.c3)
order by c3 desc limit 1;
explain select * from t1 where c1 in (select a.c2 from t1 a where a.c3 = t1.c3)
order by c3 desc limit 1;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	32	Using temporary; Using filesort
1	PRIMARY	a	ALL	NULL	NULL	NULL	NULL	32	Using where; FirstMatch(t1); Using join buffer (flat, BNL join)
explain delete from t1 where c1 in (select a.c2 from t1 a where a.c3 = t1.c3)
order by c3 desc limit 1;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	32	Using where; Using filesort
2	DEPENDENT SUBQUERY	a	ALL	NULL	NULL	NULL	NULL	32	Using where
delete from t1 where c1 in (select a.c2 from t1 a where a.c3 = t1.c3)
order by c3 desc limit 1;
affected rows: 1
select * from t1;
c1	c2	c3
1	1	1
1	2	2
1	3	3
11	1	11
11	2	12
11	3	13
12	1	14
12	2	15
12	3	16
12	4	17
12	5	18
2	1	4
2	3	6
2	4	7
2	5	8
21	2	21
21	3	22
21	4	23
22	2	24
22	3	25
22	4	26
22	5	27
22	6	28
31	2	31
31	3	32
31	4	33
32	2	34
32	3	35
32	4	36
32	5	37
32	6	38
insert into t1(c1,c2,c3) select c1,c2,c3 from tmp;
drop table tmp;
#
# Delete: 2 execution of PS
#
prepare create_tmp_stmt from
"create table tmp as select * from t1
      where c2=(select a.c3 from t1 a where a.c3 = ?)";
prepare delete_t1_stmt from
"delete from t1 where c2=(select a.c3 from t1 a where a.c3 = ?)";
set @a:=5;
execute create_tmp_stmt using @a;
execute delete_t1_stmt using @a;
execute delete_t1_stmt using @a;
select * from t1;
c1	c2	c3
1	1	1
1	2	2
1	3	3
11	1	11
11	2	12
11	3	13
12	1	14
12	2	15
12	3	16
12	4	17
2	1	4
2	2	5
2	3	6
2	4	7
21	2	21
21	3	22
21	4	23
22	2	24
22	3	25
22	4	26
22	6	28
31	2	31
31	3	32
31	4	33
32	2	34
32	3	35
32	4	36
32	6	38
prepare insert_tmp_stmt from
"insert into tmp(c1,c2,c3) select * from t1
      where c2=(select a.c3 from t1 a where a.c3 = ?)";
set @a:=2;
execute insert_tmp_stmt using @a;
execute delete_t1_stmt using @a;
select * from t1;
c1	c2	c3
1	1	1
1	3	3
11	1	11
11	3	13
12	1	14
12	3	16
12	4	17
2	1	4
2	3	6
2	4	7
21	3	22
21	4	23
22	3	25
22	4	26
22	6	28
31	3	32
31	4	33
32	3	35
32	4	36
32	6	38
insert into t1(c1,c2,c3) select c1,c2,c3 from tmp;
select * from t1;
c1	c2	c3
1	1	1
1	2	2
1	3	3
11	1	11
11	2	12
11	3	13
12	1	14
12	2	15
12	3	16
12	4	17
12	5	18
2	1	4
2	2	5
2	3	6
2	4	7
2	5	8
21	2	21
21	3	22
21	4	23
22	2	24
22	3	25
22	4	26
22	5	27
22	6	28
31	2	31
31	3	32
31	4	33
32	2	34
32	3	35
32	4	36
32	5	37
32	6	38
drop table tmp;
#
# Delete in stored procedure
#
create procedure sp()
begin
delete from t1 where c1 in (select a.c2 from t1 a where a.c3 = t1.c3)
order by c3 desc limit 1;
end
//
create table tmp as select * from t1
where c1 in (select a.c2 from t1 a where a.c3 = t1.c3)
order by c3 desc limit 1;
CALL sp;
insert into tmp(c1,c2,c3) select * from t1
where c1 in (select a.c2 from t1 a where a.c3 = t1.c3)
order by c3 desc limit 1;
CALL sp;
insert into tmp(c1,c2,c3) select * from t1
where c1 in (select a.c2 from t1 a where a.c3 = t1.c3)
order by c3 desc limit 1;
CALL sp;
select * from t1;
c1	c2	c3
1	2	2
1	3	3
11	1	11
11	2	12
11	3	13
12	1	14
12	2	15
12	3	16
12	4	17
12	5	18
2	1	4
2	3	6
2	4	7
2	5	8
21	2	21
21	3	22
21	4	23
22	2	24
22	3	25
22	4	26
22	5	27
22	6	28
31	2	31
31	3	32
31	4	33
32	2	34
32	3	35
32	4	36
32	5	37
32	6	38
insert into t1(c1,c2,c3) select c1,c2,c3 from tmp;
drop procedure sp;
drop table tmp;
#
# Delete in stored function
#
create function f1(IN a INT) returns int
begin
delete from t1 where c3 < a  order by c3 limit 1;
return  1;
end;//
set @a:=7;
create table tmp as select * from t1 where c3 < @a
order by c3 limit 1;
select f1(@a);
f1(@a)
1
insert into tmp(c1,c2,c3) select * from t1 where c3 < @a
order by c3 limit 1;
select f1(@a);
f1(@a)
1
select * from t1;
c1	c2	c3
1	3	3
11	1	11
11	2	12
11	3	13
12	1	14
12	2	15
12	3	16
12	4	17
12	5	18
2	1	4
2	2	5
2	3	6
2	4	7
2	5	8
21	2	21
21	3	22
21	4	23
22	2	24
22	3	25
22	4	26
22	5	27
22	6	28
31	2	31
31	3	32
31	4	33
32	2	34
32	3	35
32	4	36
32	5	37
32	6	38
insert into t1(c1,c2,c3) select c1,c2,c3 from tmp;
drop function f1;
drop table tmp;
#
# Delete in trigger
#
create table t2 (c1 integer);
insert into t2(c1) values (1), (2), (3), (4), (5), (6), (7), (8);
CREATE TABLE cnt(del integer);
INSERT INTO cnt VALUES(0);
CREATE TRIGGER tr1 AFTER DELETE ON t1 FOR EACH ROW
UPDATE cnt SET del=del+1;
CREATE TRIGGER tr2 AFTER DELETE ON t1 FOR EACH ROW
DELETE FROM t2 WHERE c1> (SELECT count(*)-1 FROM t2);
CREATE TABLE tmp as SELECT * FROM t1 WHERE c2>=3;
DELETE FROM t1 WHERE c2>=3;
affected rows: 20
select * from t1;
c1	c2	c3
1	1	1
1	2	2
11	1	11
11	2	12
12	1	14
12	2	15
2	1	4
2	2	5
21	2	21
22	2	24
31	2	31
32	2	34
SELECT * FROM t2;
c1
SELECT * FROM cnt;
del
20
insert into t1(c1,c2,c3) select c1,c2,c3 from tmp;
DROP TRIGGER tr1;
DROP TRIGGER tr2;
drop table t2, cnt, tmp;
#
Delete with a reference to view in subquery
#
create table tmp as select * from t1 where t1.c2 in ( select max(a.c2) from v1 a
where a.c1 = t1.c1);
explain select * from t1 where t1.c2 in ( select max(a.c2) from v1 a
where a.c1 = t1.c1);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	32	Using where
2	DEPENDENT SUBQUERY	t1	ALL	NULL	NULL	NULL	NULL	32	Using where
explain delete from t1 where t1.c2 in ( select max(a.c2) from v1 a
where a.c1 = t1.c1);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	32	Using where
2	DEPENDENT SUBQUERY	t1	ALL	NULL	NULL	NULL	NULL	32	Using where
delete from t1 where t1.c2 in ( select max(a.c2) from v1 a
where a.c1 = t1.c1);
affected rows: 8
select * from t1;
c1	c2	c3
1	1	1
1	3	3
11	1	11
11	3	13
12	1	14
12	3	16
12	4	17
12	5	18
2	1	4
2	3	6
2	4	7
2	5	8
21	3	22
21	4	23
22	3	25
22	4	26
22	5	27
22	6	28
31	3	32
31	4	33
32	3	35
32	4	36
32	5	37
32	6	38
insert into t1(c1,c2,c3) select c1,c2,c3 from tmp;
drop table tmp;
#
# Delete from view
#
analyze table t1 persistent for all;
Table	Op	Msg_type	Msg_text
test.t1	analyze	status	Engine-independent statistics collected
test.t1	analyze	note	The storage engine for the table doesn't support analyze
create table tmp as select * from v1 where v1.c1 in
(select max(a.c1) from t1 a where a.c2 = v1.c2) and c3 = 5;
explain select * from v1 where v1.c1 in
(select max(a.c1) from t1 a where a.c2 = v1.c2) and c3 = 5;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	32	Using where
2	DEPENDENT SUBQUERY	a	ALL	NULL	NULL	NULL	NULL	32	Using where
explain delete from v1 where v1.c1 in
(select max(a.c1) from t1 a where a.c2 = v1.c2) and c3 = 5;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	32	Using where
2	DEPENDENT SUBQUERY	a	ALL	NULL	NULL	NULL	NULL	32	Using where
delete from v1 where v1.c1 in
(select max(a.c1) from t1 a where a.c2 = v1.c2) and c3 = 5;
affected rows: 0
select * from t1;
c1	c2	c3
1	1	1
1	2	2
1	3	3
11	1	11
11	2	12
11	3	13
12	1	14
12	2	15
12	3	16
12	4	17
12	5	18
2	1	4
2	2	5
2	3	6
2	4	7
2	5	8
21	2	21
21	3	22
21	4	23
22	2	24
22	3	25
22	4	26
22	5	27
22	6	28
31	2	31
31	3	32
31	4	33
32	2	34
32	3	35
32	4	36
32	5	37
32	6	38
insert into t1(c1,c2,c3) select c1,c2,c3 from tmp;
drop table tmp;
#
# Delete from view using reference
# to the same view in subquery
#
analyze table t1 persistent for all;
Table	Op	Msg_type	Msg_text
test.t1	analyze	status	Engine-independent statistics collected
test.t1	analyze	note	The storage engine for the table doesn't support analyze
create table tmp as select * from v1 where v1.c2 in (select max(a.c2) from t1 a where a.c3 = v1.c3)
and c1 = 2
and exists (select 'X' from v1 a where a.c1 = v1.c1);
explain select * from v1 where v1.c2 in (select max(a.c2) from t1 a where a.c3 = v1.c3)
and c1 = 2
and exists (select 'X' from v1 a where a.c1 = v1.c1);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	32	Using where
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	32	Using where; FirstMatch(t1); Using join buffer (flat, BNL join)
2	DEPENDENT SUBQUERY	a	ALL	NULL	NULL	NULL	NULL	32	Using where
explain delete from v1 where v1.c2 in (select max(a.c2) from t1 a where a.c3 = v1.c3)
and c1 = 2
and exists (select 'X' from v1 a where a.c1 = v1.c1);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	32	Using where
3	DEPENDENT SUBQUERY	t1	ALL	NULL	NULL	NULL	NULL	32	Using where
2	DEPENDENT SUBQUERY	a	ALL	NULL	NULL	NULL	NULL	32	Using where
delete from v1 where v1.c2 in (select max(a.c2) from t1 a where a.c3 = v1.c3)
and c1 = 2
and exists (select 'X' from v1 a where a.c1 = v1.c1);
affected rows: 1
select * from t1;
c1	c2	c3
1	1	1
1	2	2
1	3	3
11	1	11
11	2	12
11	3	13
12	1	14
12	2	15
12	3	16
12	4	17
12	5	18
2	1	4
2	3	6
2	4	7
2	5	8
21	2	21
21	3	22
21	4	23
22	2	24
22	3	25
22	4	26
22	5	27
22	6	28
31	2	31
31	3	32
31	4	33
32	2	34
32	3	35
32	4	36
32	5	37
32	6	38
insert into t1(c1,c2,c3) select c1,c2,c3 from tmp;
drop table tmp;
#######################################
#          Test with an index         #
#######################################
create index t1_c2 on t1 (c2,c1);
#
# Delete with value from subquery on the same table
#
analyze table t1 persistent for all;
Table	Op	Msg_type	Msg_text
test.t1	analyze	status	Operation failed
create table tmp as select * from t1 where c1=(select a.c3 from t1 a where a.c3 = t1.c3);
explain select * from t1 where c1=(select a.c3 from t1 a where a.c3 = t1.c3);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	32	Using where
2	DEPENDENT SUBQUERY	a	ALL	NULL	NULL	NULL	NULL	32	Using where
explain delete from t1 where c1=(select a.c3 from t1 a where a.c3 = t1.c3);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	32	Using where
2	DEPENDENT SUBQUERY	a	ALL	NULL	NULL	NULL	NULL	32	Using where
delete from t1 where c1=(select a.c3 from t1 a where a.c3 = t1.c3);
affected rows: 4
select * from t1;
c1	c2	c3
1	2	2
1	3	3
11	2	12
11	3	13
12	1	14
12	2	15
12	3	16
12	4	17
12	5	18
2	1	4
2	2	5
2	3	6
2	4	7
2	5	8
21	3	22
21	4	23
22	2	24
22	3	25
22	4	26
22	5	27
22	6	28
31	3	32
31	4	33
32	2	34
32	3	35
32	4	36
32	5	37
32	6	38
insert into t1(c1,c2,c3) select c1,c2,c3 from tmp;
drop table tmp;
#
# Delete with EXISTS subquery over the updated table
# in WHERE + possibly sargable condition
#
analyze table t1 persistent for all;
Table	Op	Msg_type	Msg_text
test.t1	analyze	status	Operation failed
create table tmp as select * from t1 where c1 = 1 and exists (select 'X' from t1 a where a.c1 = t1.c2);
explain select * from t1 where c1 = 1 and exists (select 'X' from t1 a where a.c1 = t1.c2);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	t1_c2	NULL	NULL	NULL	32	Using where
1	PRIMARY	a	ALL	NULL	NULL	NULL	NULL	32	Using where; FirstMatch(t1); Using join buffer (flat, BNL join)
explain delete from t1 where c1 = 1 and exists (select 'X' from t1 a where a.c1 = t1.c2);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	t1_c2	NULL	NULL	NULL	32	Using where
1	PRIMARY	a	ALL	NULL	NULL	NULL	NULL	32	Using where; FirstMatch(t1)
delete from t1 where c1 = 1 and exists (select 'X' from t1 a where a.c1 = t1.c2);
affected rows: 2
select * from t1;
c1	c2	c3
1	3	3
11	1	11
11	2	12
11	3	13
12	1	14
12	2	15
12	3	16
12	4	17
12	5	18
2	1	4
2	2	5
2	3	6
2	4	7
2	5	8
21	2	21
21	3	22
21	4	23
22	2	24
22	3	25
22	4	26
22	5	27
22	6	28
31	2	31
31	3	32
31	4	33
32	2	34
32	3	35
32	4	36
32	5	37
32	6	38
insert into t1(c1,c2,c3) select c1,c2,c3 from tmp;
drop table tmp;
#
# Delete with EXISTS subquery over the updated table
# in WHERE + non-sargable condition
#
analyze table t1 persistent for all;
Table	Op	Msg_type	Msg_text
test.t1	analyze	status	Operation failed
create table tmp as select * from t1 where exists (select 'X' from t1 a where a.c2 = t1.c2) and c2 = 3;
explain select * from t1 where exists (select 'X' from t1 a where a.c2 = t1.c2) and c2 = 3;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	t1_c2	NULL	NULL	NULL	32	Using where
1	PRIMARY	a	ALL	t1_c2	NULL	NULL	NULL	32	Using where; FirstMatch(t1); Using join buffer (flat, BNL join)
explain delete from t1 where exists (select 'X' from t1 a where a.c2 = t1.c2) and c2 = 3;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	t1_c2	NULL	NULL	NULL	32	Using where
1	PRIMARY	a	ALL	t1_c2	NULL	NULL	NULL	32	Using where; FirstMatch(t1)
delete from t1 where exists (select 'X' from t1 a where a.c2 = t1.c2) and c2 = 3;
affected rows: 8
select * from t1;
c1	c2	c3
1	1	1
1	2	2
11	1	11
11	2	12
12	1	14
12	2	15
12	4	17
12	5	18
2	1	4
2	2	5
2	4	7
2	5	8
21	2	21
21	4	23
22	2	24
22	4	26
22	5	27
22	6	28
31	2	31
31	4	33
32	2	34
32	4	36
32	5	37
32	6	38
insert into t1(c1,c2,c3) select c1,c2,c3 from tmp;
drop table tmp;
#
# Delete with order by
#
analyze table t1 persistent for all;
Table	Op	Msg_type	Msg_text
test.t1	analyze	status	Operation failed
create table tmp as select * from t1 where exists (select 'X' from t1 a where a.c2 = t1.c2)
and c2 >= 3 order by c2;
explain select * from t1 where exists (select 'X' from t1 a where a.c2 = t1.c2)
and c2 >= 3 order by c2;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	t1_c2	NULL	NULL	NULL	32	Using where; Using filesort
1	PRIMARY	<subquery2>	eq_ref	distinct_key	distinct_key	4	func	1	
2	MATERIALIZED	a	ALL	t1_c2	NULL	NULL	NULL	32	
explain delete from t1 where exists (select 'X' from t1 a where a.c2 = t1.c2)
and c2 >= 3 order by c2;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	t1_c2	NULL	NULL	NULL	32	Using where
1	PRIMARY	<subquery2>	eq_ref	distinct_key	distinct_key	4	func	1	
2	MATERIALIZED	a	ALL	t1_c2	NULL	NULL	NULL	32	
delete from t1 where exists (select 'X' from t1 a where a.c2 = t1.c2)
and c2 >= 3 order by c2;
affected rows: 20
select * from t1;
c1	c2	c3
1	1	1
1	2	2
11	1	11
11	2	12
12	1	14
12	2	15
2	1	4
2	2	5
21	2	21
22	2	24
31	2	31
32	2	34
insert into t1(c1,c2,c3) select c1,c2,c3 from tmp;
drop table tmp;
#
# Delete with IN predicand over the updated table in WHERE
#
create table tmp as select * from t1 where c3 in (select distinct a.c1 from t1 a where t1.c2=a.c2);
explain select * from t1 where c3 in (select distinct a.c1 from t1 a where t1.c2=a.c2);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	t1_c2	NULL	NULL	NULL	32	Using where
1	PRIMARY	a	ref	t1_c2	t1_c2	10	test.t1.c2,test.t1.c3	2	FirstMatch(t1)
explain delete from t1 where c3 in (select distinct a.c1 from t1 a where t1.c2=a.c2);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	t1_c2	NULL	NULL	NULL	32	Using where
1	PRIMARY	a	ref	t1_c2	t1_c2	10	test.t1.c2,test.t1.c3	2	FirstMatch(t1)
delete from t1 where c3 in (select distinct a.c1 from t1 a where t1.c2=a.c2);
affected rows: 8
select * from t1;
c1	c2	c3
1	3	3
11	3	13
12	1	14
12	2	15
12	3	16
12	4	17
12	5	18
2	1	4
2	2	5
2	3	6
2	4	7
2	5	8
21	4	23
22	2	24
22	3	25
22	4	26
22	5	27
22	6	28
31	4	33
32	2	34
32	3	35
32	4	36
32	5	37
32	6	38
insert into t1(c1,c2,c3) select c1,c2,c3 from tmp;
drop table tmp;
#
# Delete with a limit - can be deleted
#
create table tmp as select * from t1 where c1 in (select a.c2 from t1 a where a.c2 = t1.c3) limit 1;
explain select * from t1 where c1 in (select a.c2 from t1 a where a.c2 = t1.c3) limit 1;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	32	Using where
1	PRIMARY	a	ALL	t1_c2	NULL	NULL	NULL	32	Using where; FirstMatch(t1); Using join buffer (flat, BNL join)
explain delete from t1 where c1 in (select a.c2 from t1 a where a.c2 = t1.c3) limit 1;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	32	Using where
1	PRIMARY	a	ALL	t1_c2	NULL	NULL	NULL	32	Using where; FirstMatch(t1)
delete from t1 where c1 in (select a.c2 from t1 a where a.c2 = t1.c3) limit 1;
affected rows: 1
select * from t1;
c1	c2	c3
1	2	2
1	3	3
11	1	11
11	2	12
11	3	13
12	1	14
12	2	15
12	3	16
12	4	17
12	5	18
2	1	4
2	2	5
2	3	6
2	4	7
2	5	8
21	2	21
21	3	22
21	4	23
22	2	24
22	3	25
22	4	26
22	5	27
22	6	28
31	2	31
31	3	32
31	4	33
32	2	34
32	3	35
32	4	36
32	5	37
32	6	38
insert into t1(c1,c2,c3) select c1,c2,c3 from tmp;
drop table tmp;
#
# Delete with a limit and an order by
#
create table tmp as select * from t1 where c1 in (select a.c2 from t1 a where a.c3 = t1.c3)
order by c3 desc limit 1;
explain select * from t1 where c1 in (select a.c2 from t1 a where a.c3 = t1.c3)
order by c3 desc limit 1;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	32	Using temporary; Using filesort
1	PRIMARY	a	ALL	t1_c2	NULL	NULL	NULL	32	Using where; FirstMatch(t1); Using join buffer (flat, BNL join)
explain delete from t1 where c1 in (select a.c2 from t1 a where a.c3 = t1.c3)
order by c3 desc limit 1;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	32	Using where; Using filesort
2	DEPENDENT SUBQUERY	a	ALL	t1_c2	NULL	NULL	NULL	32	Using where
delete from t1 where c1 in (select a.c2 from t1 a where a.c3 = t1.c3)
order by c3 desc limit 1;
affected rows: 1
select * from t1;
c1	c2	c3
1	1	1
1	2	2
1	3	3
11	1	11
11	2	12
11	3	13
12	1	14
12	2	15
12	3	16
12	4	17
12	5	18
2	1	4
2	3	6
2	4	7
2	5	8
21	2	21
21	3	22
21	4	23
22	2	24
22	3	25
22	4	26
22	5	27
22	6	28
31	2	31
31	3	32
31	4	33
32	2	34
32	3	35
32	4	36
32	5	37
32	6	38
insert into t1(c1,c2,c3) select c1,c2,c3 from tmp;
drop table tmp;
#
# Delete: 2 execution of PS
#
prepare create_tmp_stmt from
"create table tmp as select * from t1
      where c2=(select a.c3 from t1 a where a.c3 = ?)";
prepare delete_t1_stmt from
"delete from t1 where c2=(select a.c3 from t1 a where a.c3 = ?)";
set @a:=5;
execute create_tmp_stmt using @a;
execute delete_t1_stmt using @a;
execute delete_t1_stmt using @a;
select * from t1;
c1	c2	c3
1	1	1
1	2	2
1	3	3
11	1	11
11	2	12
11	3	13
12	1	14
12	2	15
12	3	16
12	4	17
2	1	4
2	2	5
2	3	6
2	4	7
21	2	21
21	3	22
21	4	23
22	2	24
22	3	25
22	4	26
22	6	28
31	2	31
31	3	32
31	4	33
32	2	34
32	3	35
32	4	36
32	6	38
prepare insert_tmp_stmt from
"insert into tmp(c1,c2,c3) select * from t1
      where c2=(select a.c3 from t1 a where a.c3 = ?)";
set @a:=2;
execute insert_tmp_stmt using @a;
execute delete_t1_stmt using @a;
select * from t1;
c1	c2	c3
1	1	1
1	3	3
11	1	11
11	3	13
12	1	14
12	3	16
12	4	17
2	1	4
2	3	6
2	4	7
21	3	22
21	4	23
22	3	25
22	4	26
22	6	28
31	3	32
31	4	33
32	3	35
32	4	36
32	6	38
insert into t1(c1,c2,c3) select c1,c2,c3 from tmp;
select * from t1;
c1	c2	c3
1	1	1
1	2	2
1	3	3
11	1	11
11	2	12
11	3	13
12	1	14
12	2	15
12	3	16
12	4	17
12	5	18
2	1	4
2	2	5
2	3	6
2	4	7
2	5	8
21	2	21
21	3	22
21	4	23
22	2	24
22	3	25
22	4	26
22	5	27
22	6	28
31	2	31
31	3	32
31	4	33
32	2	34
32	3	35
32	4	36
32	5	37
32	6	38
drop table tmp;
#
# Delete in stored procedure
#
create procedure sp()
begin
delete from t1 where c1 in (select a.c2 from t1 a where a.c3 = t1.c3)
order by c3 desc limit 1;
end
//
create table tmp as select * from t1
where c1 in (select a.c2 from t1 a where a.c3 = t1.c3)
order by c3 desc limit 1;
CALL sp;
insert into tmp(c1,c2,c3) select * from t1
where c1 in (select a.c2 from t1 a where a.c3 = t1.c3)
order by c3 desc limit 1;
CALL sp;
insert into tmp(c1,c2,c3) select * from t1
where c1 in (select a.c2 from t1 a where a.c3 = t1.c3)
order by c3 desc limit 1;
CALL sp;
select * from t1;
c1	c2	c3
1	2	2
1	3	3
11	1	11
11	2	12
11	3	13
12	1	14
12	2	15
12	3	16
12	4	17
12	5	18
2	1	4
2	3	6
2	4	7
2	5	8
21	2	21
21	3	22
21	4	23
22	2	24
22	3	25
22	4	26
22	5	27
22	6	28
31	2	31
31	3	32
31	4	33
32	2	34
32	3	35
32	4	36
32	5	37
32	6	38
insert into t1(c1,c2,c3) select c1,c2,c3 from tmp;
drop procedure sp;
drop table tmp;
#
# Delete in stored function
#
create function f1(IN a INT) returns int
begin
delete from t1 where c3 < a  order by c3 limit 1;
return  1;
end;//
set @a:=7;
create table tmp as select * from t1 where c3 < @a
order by c3 limit 1;
select f1(@a);
f1(@a)
1
insert into tmp(c1,c2,c3) select * from t1 where c3 < @a
order by c3 limit 1;
select f1(@a);
f1(@a)
1
select * from t1;
c1	c2	c3
1	3	3
11	1	11
11	2	12
11	3	13
12	1	14
12	2	15
12	3	16
12	4	17
12	5	18
2	1	4
2	2	5
2	3	6
2	4	7
2	5	8
21	2	21
21	3	22
21	4	23
22	2	24
22	3	25
22	4	26
22	5	27
22	6	28
31	2	31
31	3	32
31	4	33
32	2	34
32	3	35
32	4	36
32	5	37
32	6	38
insert into t1(c1,c2,c3) select c1,c2,c3 from tmp;
drop function f1;
drop table tmp;
#
# Delete in trigger
#
create table t2 (c1 integer);
insert into t2(c1) values (1), (2), (3), (4), (5), (6), (7), (8);
CREATE TABLE cnt(del integer);
INSERT INTO cnt VALUES(0);
CREATE TRIGGER tr1 AFTER DELETE ON t1 FOR EACH ROW
UPDATE cnt SET del=del+1;
CREATE TRIGGER tr2 AFTER DELETE ON t1 FOR EACH ROW
DELETE FROM t2 WHERE c1> (SELECT count(*)-1 FROM t2);
CREATE TABLE tmp as SELECT * FROM t1 WHERE c2>=3;
DELETE FROM t1 WHERE c2>=3;
affected rows: 20
select * from t1;
c1	c2	c3
1	1	1
1	2	2
11	1	11
11	2	12
12	1	14
12	2	15
2	1	4
2	2	5
21	2	21
22	2	24
31	2	31
32	2	34
SELECT * FROM t2;
c1
SELECT * FROM cnt;
del
20
insert into t1(c1,c2,c3) select c1,c2,c3 from tmp;
DROP TRIGGER tr1;
DROP TRIGGER tr2;
drop table t2, cnt, tmp;
#
Delete with a reference to view in subquery
#
create table tmp as select * from t1 where t1.c2 in ( select max(a.c2) from v1 a
where a.c1 = t1.c1);
explain select * from t1 where t1.c2 in ( select max(a.c2) from v1 a
where a.c1 = t1.c1);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	32	Using where
2	DEPENDENT SUBQUERY	t1	ref	t1_c2	t1_c2	10	const,test.t1.c1	2	
explain delete from t1 where t1.c2 in ( select max(a.c2) from v1 a
where a.c1 = t1.c1);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	32	Using where
2	DEPENDENT SUBQUERY	t1	ref	t1_c2	t1_c2	10	const,test.t1.c1	2	
delete from t1 where t1.c2 in ( select max(a.c2) from v1 a
where a.c1 = t1.c1);
affected rows: 8
select * from t1;
c1	c2	c3
1	1	1
1	3	3
11	1	11
11	3	13
12	1	14
12	3	16
12	4	17
12	5	18
2	1	4
2	3	6
2	4	7
2	5	8
21	3	22
21	4	23
22	3	25
22	4	26
22	5	27
22	6	28
31	3	32
31	4	33
32	3	35
32	4	36
32	5	37
32	6	38
insert into t1(c1,c2,c3) select c1,c2,c3 from tmp;
drop table tmp;
#
# Delete from view
#
analyze table t1 persistent for all;
Table	Op	Msg_type	Msg_text
test.t1	analyze	status	Operation failed
create table tmp as select * from v1 where v1.c1 in
(select max(a.c1) from t1 a where a.c2 = v1.c2) and c3 = 5;
explain select * from v1 where v1.c1 in
(select max(a.c1) from t1 a where a.c2 = v1.c2) and c3 = 5;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	t1_c2	NULL	NULL	NULL	32	Using where
2	DEPENDENT SUBQUERY	a	ALL	t1_c2	NULL	NULL	NULL	32	Using where
explain delete from v1 where v1.c1 in
(select max(a.c1) from t1 a where a.c2 = v1.c2) and c3 = 5;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	t1_c2	NULL	NULL	NULL	32	Using where
2	DEPENDENT SUBQUERY	a	ALL	t1_c2	NULL	NULL	NULL	32	Using where
delete from v1 where v1.c1 in
(select max(a.c1) from t1 a where a.c2 = v1.c2) and c3 = 5;
affected rows: 0
select * from t1;
c1	c2	c3
1	1	1
1	2	2
1	3	3
11	1	11
11	2	12
11	3	13
12	1	14
12	2	15
12	3	16
12	4	17
12	5	18
2	1	4
2	2	5
2	3	6
2	4	7
2	5	8
21	2	21
21	3	22
21	4	23
22	2	24
22	3	25
22	4	26
22	5	27
22	6	28
31	2	31
31	3	32
31	4	33
32	2	34
32	3	35
32	4	36
32	5	37
32	6	38
insert into t1(c1,c2,c3) select c1,c2,c3 from tmp;
drop table tmp;
#
# Delete from view using reference
# to the same view in subquery
#
analyze table t1 persistent for all;
Table	Op	Msg_type	Msg_text
test.t1	analyze	status	Operation failed
create table tmp as select * from v1 where v1.c2 in (select max(a.c2) from t1 a where a.c3 = v1.c3)
and c1 = 2
and exists (select 'X' from v1 a where a.c1 = v1.c1);
explain select * from v1 where v1.c2 in (select max(a.c2) from t1 a where a.c3 = v1.c3)
and c1 = 2
and exists (select 'X' from v1 a where a.c1 = v1.c1);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ref	t1_c2	t1_c2	10	const,const	2	Using where
1	PRIMARY	t1	ref	t1_c2	t1_c2	10	const,const	2	FirstMatch(t1)
2	DEPENDENT SUBQUERY	a	ALL	NULL	NULL	NULL	NULL	32	Using where
explain delete from v1 where v1.c2 in (select max(a.c2) from t1 a where a.c3 = v1.c3)
and c1 = 2
and exists (select 'X' from v1 a where a.c1 = v1.c1);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ref	t1_c2	t1_c2	10	const,const	2	Using where
3	DEPENDENT SUBQUERY	t1	ref	t1_c2	t1_c2	10	const,func	2	Using where
2	DEPENDENT SUBQUERY	a	ALL	NULL	NULL	NULL	NULL	32	Using where
delete from v1 where v1.c2 in (select max(a.c2) from t1 a where a.c3 = v1.c3)
and c1 = 2
and exists (select 'X' from v1 a where a.c1 = v1.c1);
affected rows: 1
select * from t1;
c1	c2	c3
1	1	1
1	2	2
1	3	3
11	1	11
11	2	12
11	3	13
12	1	14
12	2	15
12	3	16
12	4	17
12	5	18
2	1	4
2	3	6
2	4	7
2	5	8
21	2	21
21	3	22
21	4	23
22	2	24
22	3	25
22	4	26
22	5	27
22	6	28
31	2	31
31	3	32
31	4	33
32	2	34
32	3	35
32	4	36
32	5	37
32	6	38
insert into t1(c1,c2,c3) select c1,c2,c3 from tmp;
drop table tmp;
#######################################
#       Test with a primary key       #
#######################################
drop index t1_c2 on t1;
alter table t1 add primary key (c3);
#
# Delete with value from subquery on the same table
#
analyze table t1 persistent for all;
Table	Op	Msg_type	Msg_text
test.t1	analyze	status	Engine-independent statistics collected
test.t1	analyze	note	The storage engine for the table doesn't support analyze
create table tmp as select * from t1 where c1=(select a.c3 from t1 a where a.c3 = t1.c3);
explain select * from t1 where c1=(select a.c3 from t1 a where a.c3 = t1.c3);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	32	Using where
2	DEPENDENT SUBQUERY	a	eq_ref	PRIMARY	PRIMARY	4	test.t1.c3	1	
explain delete from t1 where c1=(select a.c3 from t1 a where a.c3 = t1.c3);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	32	Using where
2	DEPENDENT SUBQUERY	a	eq_ref	PRIMARY	PRIMARY	4	test.t1.c3	1	
delete from t1 where c1=(select a.c3 from t1 a where a.c3 = t1.c3);
affected rows: 4
select * from t1;
c1	c2	c3
1	2	2
1	3	3
11	2	12
11	3	13
12	1	14
12	2	15
12	3	16
12	4	17
12	5	18
2	1	4
2	2	5
2	3	6
2	4	7
2	5	8
21	3	22
21	4	23
22	2	24
22	3	25
22	4	26
22	5	27
22	6	28
31	3	32
31	4	33
32	2	34
32	3	35
32	4	36
32	5	37
32	6	38
insert into t1(c1,c2,c3) select c1,c2,c3 from tmp;
drop table tmp;
#
# Delete with EXISTS subquery over the updated table
# in WHERE + possibly sargable condition
#
analyze table t1 persistent for all;
Table	Op	Msg_type	Msg_text
test.t1	analyze	status	Engine-independent statistics collected
test.t1	analyze	note	The storage engine for the table doesn't support analyze
create table tmp as select * from t1 where c1 = 1 and exists (select 'X' from t1 a where a.c1 = t1.c2);
explain select * from t1 where c1 = 1 and exists (select 'X' from t1 a where a.c1 = t1.c2);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	32	Using where
1	PRIMARY	a	ALL	NULL	NULL	NULL	NULL	32	Using where; FirstMatch(t1); Using join buffer (flat, BNL join)
explain delete from t1 where c1 = 1 and exists (select 'X' from t1 a where a.c1 = t1.c2);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	32	Using where
1	PRIMARY	a	ALL	NULL	NULL	NULL	NULL	32	Using where; FirstMatch(t1)
delete from t1 where c1 = 1 and exists (select 'X' from t1 a where a.c1 = t1.c2);
affected rows: 2
select * from t1;
c1	c2	c3
1	3	3
11	1	11
11	2	12
11	3	13
12	1	14
12	2	15
12	3	16
12	4	17
12	5	18
2	1	4
2	2	5
2	3	6
2	4	7
2	5	8
21	2	21
21	3	22
21	4	23
22	2	24
22	3	25
22	4	26
22	5	27
22	6	28
31	2	31
31	3	32
31	4	33
32	2	34
32	3	35
32	4	36
32	5	37
32	6	38
insert into t1(c1,c2,c3) select c1,c2,c3 from tmp;
drop table tmp;
#
# Delete with EXISTS subquery over the updated table
# in WHERE + non-sargable condition
#
analyze table t1 persistent for all;
Table	Op	Msg_type	Msg_text
test.t1	analyze	status	Engine-independent statistics collected
test.t1	analyze	note	The storage engine for the table doesn't support analyze
create table tmp as select * from t1 where exists (select 'X' from t1 a where a.c2 = t1.c2) and c2 = 3;
explain select * from t1 where exists (select 'X' from t1 a where a.c2 = t1.c2) and c2 = 3;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	32	Using where
1	PRIMARY	a	ALL	NULL	NULL	NULL	NULL	32	Using where; FirstMatch(t1); Using join buffer (flat, BNL join)
explain delete from t1 where exists (select 'X' from t1 a where a.c2 = t1.c2) and c2 = 3;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	32	Using where
1	PRIMARY	a	ALL	NULL	NULL	NULL	NULL	32	Using where; FirstMatch(t1)
delete from t1 where exists (select 'X' from t1 a where a.c2 = t1.c2) and c2 = 3;
affected rows: 8
select * from t1;
c1	c2	c3
1	1	1
1	2	2
11	1	11
11	2	12
12	1	14
12	2	15
12	4	17
12	5	18
2	1	4
2	2	5
2	4	7
2	5	8
21	2	21
21	4	23
22	2	24
22	4	26
22	5	27
22	6	28
31	2	31
31	4	33
32	2	34
32	4	36
32	5	37
32	6	38
insert into t1(c1,c2,c3) select c1,c2,c3 from tmp;
drop table tmp;
#
# Delete with order by
#
analyze table t1 persistent for all;
Table	Op	Msg_type	Msg_text
test.t1	analyze	status	Engine-independent statistics collected
test.t1	analyze	note	The storage engine for the table doesn't support analyze
create table tmp as select * from t1 where exists (select 'X' from t1 a where a.c2 = t1.c2)
and c2 >= 3 order by c2;
explain select * from t1 where exists (select 'X' from t1 a where a.c2 = t1.c2)
and c2 >= 3 order by c2;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	32	Using where; Using filesort
1	PRIMARY	<subquery2>	eq_ref	distinct_key	distinct_key	4	func	1	
2	MATERIALIZED	a	ALL	NULL	NULL	NULL	NULL	32	
explain delete from t1 where exists (select 'X' from t1 a where a.c2 = t1.c2)
and c2 >= 3 order by c2;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	32	Using where
1	PRIMARY	<subquery2>	eq_ref	distinct_key	distinct_key	4	func	1	
2	MATERIALIZED	a	ALL	NULL	NULL	NULL	NULL	32	
delete from t1 where exists (select 'X' from t1 a where a.c2 = t1.c2)
and c2 >= 3 order by c2;
affected rows: 20
select * from t1;
c1	c2	c3
1	1	1
1	2	2
11	1	11
11	2	12
12	1	14
12	2	15
2	1	4
2	2	5
21	2	21
22	2	24
31	2	31
32	2	34
insert into t1(c1,c2,c3) select c1,c2,c3 from tmp;
drop table tmp;
#
# Delete with IN predicand over the updated table in WHERE
#
create table tmp as select * from t1 where c3 in (select distinct a.c1 from t1 a where t1.c2=a.c2);
explain select * from t1 where c3 in (select distinct a.c1 from t1 a where t1.c2=a.c2);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	a	ALL	NULL	NULL	NULL	NULL	32	Using where; Start temporary
1	PRIMARY	t1	eq_ref	PRIMARY	PRIMARY	4	test.a.c1	1	Using where; End temporary
explain delete from t1 where c3 in (select distinct a.c1 from t1 a where t1.c2=a.c2);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	a	ALL	NULL	NULL	NULL	NULL	32	Using where; Start temporary
1	PRIMARY	t1	eq_ref	PRIMARY	PRIMARY	4	test.a.c1	1	Using where; End temporary
delete from t1 where c3 in (select distinct a.c1 from t1 a where t1.c2=a.c2);
affected rows: 8
select * from t1;
c1	c2	c3
1	3	3
11	3	13
12	1	14
12	2	15
12	3	16
12	4	17
12	5	18
2	1	4
2	2	5
2	3	6
2	4	7
2	5	8
21	4	23
22	2	24
22	3	25
22	4	26
22	5	27
22	6	28
31	4	33
32	2	34
32	3	35
32	4	36
32	5	37
32	6	38
insert into t1(c1,c2,c3) select c1,c2,c3 from tmp;
drop table tmp;
#
# Delete with a limit - can be deleted
#
create table tmp as select * from t1 where c1 in (select a.c2 from t1 a where a.c2 = t1.c3) limit 1;
explain select * from t1 where c1 in (select a.c2 from t1 a where a.c2 = t1.c3) limit 1;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	a	ALL	NULL	NULL	NULL	NULL	32	Using where; Start temporary
1	PRIMARY	t1	eq_ref	PRIMARY	PRIMARY	4	test.a.c2	1	Using where; End temporary
explain delete from t1 where c1 in (select a.c2 from t1 a where a.c2 = t1.c3) limit 1;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	a	ALL	NULL	NULL	NULL	NULL	32	Using where; Start temporary
1	PRIMARY	t1	eq_ref	PRIMARY	PRIMARY	4	test.a.c2	1	Using where; End temporary
delete from t1 where c1 in (select a.c2 from t1 a where a.c2 = t1.c3) limit 1;
affected rows: 1
select * from t1;
c1	c2	c3
1	2	2
1	3	3
11	1	11
11	2	12
11	3	13
12	1	14
12	2	15
12	3	16
12	4	17
12	5	18
2	1	4
2	2	5
2	3	6
2	4	7
2	5	8
21	2	21
21	3	22
21	4	23
22	2	24
22	3	25
22	4	26
22	5	27
22	6	28
31	2	31
31	3	32
31	4	33
32	2	34
32	3	35
32	4	36
32	5	37
32	6	38
insert into t1(c1,c2,c3) select c1,c2,c3 from tmp;
drop table tmp;
#
# Delete with a limit and an order by
#
create table tmp as select * from t1 where c1 in (select a.c2 from t1 a where a.c3 = t1.c3)
order by c3 desc limit 1;
explain select * from t1 where c1 in (select a.c2 from t1 a where a.c3 = t1.c3)
order by c3 desc limit 1;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	PRIMARY	NULL	NULL	NULL	32	Using filesort
1	PRIMARY	a	eq_ref	PRIMARY	PRIMARY	4	test.t1.c3	1	Using where
explain delete from t1 where c1 in (select a.c2 from t1 a where a.c3 = t1.c3)
order by c3 desc limit 1;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	32	Using where; Using filesort
2	DEPENDENT SUBQUERY	a	eq_ref	PRIMARY	PRIMARY	4	test.t1.c3	1	Using where
delete from t1 where c1 in (select a.c2 from t1 a where a.c3 = t1.c3)
order by c3 desc limit 1;
affected rows: 1
select * from t1;
c1	c2	c3
1	1	1
1	2	2
1	3	3
11	1	11
11	2	12
11	3	13
12	1	14
12	2	15
12	3	16
12	4	17
12	5	18
2	1	4
2	3	6
2	4	7
2	5	8
21	2	21
21	3	22
21	4	23
22	2	24
22	3	25
22	4	26
22	5	27
22	6	28
31	2	31
31	3	32
31	4	33
32	2	34
32	3	35
32	4	36
32	5	37
32	6	38
insert into t1(c1,c2,c3) select c1,c2,c3 from tmp;
drop table tmp;
#
# Delete: 2 execution of PS
#
prepare create_tmp_stmt from
"create table tmp as select * from t1
      where c2=(select a.c3 from t1 a where a.c3 = ?)";
prepare delete_t1_stmt from
"delete from t1 where c2=(select a.c3 from t1 a where a.c3 = ?)";
set @a:=5;
execute create_tmp_stmt using @a;
execute delete_t1_stmt using @a;
execute delete_t1_stmt using @a;
select * from t1;
c1	c2	c3
1	1	1
1	2	2
1	3	3
11	1	11
11	2	12
11	3	13
12	1	14
12	2	15
12	3	16
12	4	17
2	1	4
2	2	5
2	3	6
2	4	7
21	2	21
21	3	22
21	4	23
22	2	24
22	3	25
22	4	26
22	6	28
31	2	31
31	3	32
31	4	33
32	2	34
32	3	35
32	4	36
32	6	38
prepare insert_tmp_stmt from
"insert into tmp(c1,c2,c3) select * from t1
      where c2=(select a.c3 from t1 a where a.c3 = ?)";
set @a:=2;
execute insert_tmp_stmt using @a;
execute delete_t1_stmt using @a;
select * from t1;
c1	c2	c3
1	1	1
1	3	3
11	1	11
11	3	13
12	1	14
12	3	16
12	4	17
2	1	4
2	3	6
2	4	7
21	3	22
21	4	23
22	3	25
22	4	26
22	6	28
31	3	32
31	4	33
32	3	35
32	4	36
32	6	38
insert into t1(c1,c2,c3) select c1,c2,c3 from tmp;
select * from t1;
c1	c2	c3
1	1	1
1	2	2
1	3	3
11	1	11
11	2	12
11	3	13
12	1	14
12	2	15
12	3	16
12	4	17
12	5	18
2	1	4
2	2	5
2	3	6
2	4	7
2	5	8
21	2	21
21	3	22
21	4	23
22	2	24
22	3	25
22	4	26
22	5	27
22	6	28
31	2	31
31	3	32
31	4	33
32	2	34
32	3	35
32	4	36
32	5	37
32	6	38
drop table tmp;
#
# Delete in stored procedure
#
create procedure sp()
begin
delete from t1 where c1 in (select a.c2 from t1 a where a.c3 = t1.c3)
order by c3 desc limit 1;
end
//
create table tmp as select * from t1
where c1 in (select a.c2 from t1 a where a.c3 = t1.c3)
order by c3 desc limit 1;
CALL sp;
insert into tmp(c1,c2,c3) select * from t1
where c1 in (select a.c2 from t1 a where a.c3 = t1.c3)
order by c3 desc limit 1;
CALL sp;
insert into tmp(c1,c2,c3) select * from t1
where c1 in (select a.c2 from t1 a where a.c3 = t1.c3)
order by c3 desc limit 1;
CALL sp;
select * from t1;
c1	c2	c3
1	2	2
1	3	3
11	1	11
11	2	12
11	3	13
12	1	14
12	2	15
12	3	16
12	4	17
12	5	18
2	1	4
2	3	6
2	4	7
2	5	8
21	2	21
21	3	22
21	4	23
22	2	24
22	3	25
22	4	26
22	5	27
22	6	28
31	2	31
31	3	32
31	4	33
32	2	34
32	3	35
32	4	36
32	5	37
32	6	38
insert into t1(c1,c2,c3) select c1,c2,c3 from tmp;
drop procedure sp;
drop table tmp;
#
# Delete in stored function
#
create function f1(IN a INT) returns int
begin
delete from t1 where c3 < a  order by c3 limit 1;
return  1;
end;//
set @a:=7;
create table tmp as select * from t1 where c3 < @a
order by c3 limit 1;
select f1(@a);
f1(@a)
1
insert into tmp(c1,c2,c3) select * from t1 where c3 < @a
order by c3 limit 1;
select f1(@a);
f1(@a)
1
select * from t1;
c1	c2	c3
1	3	3
11	1	11
11	2	12
11	3	13
12	1	14
12	2	15
12	3	16
12	4	17
12	5	18
2	1	4
2	2	5
2	3	6
2	4	7
2	5	8
21	2	21
21	3	22
21	4	23
22	2	24
22	3	25
22	4	26
22	5	27
22	6	28
31	2	31
31	3	32
31	4	33
32	2	34
32	3	35
32	4	36
32	5	37
32	6	38
insert into t1(c1,c2,c3) select c1,c2,c3 from tmp;
drop function f1;
drop table tmp;
#
# Delete in trigger
#
create table t2 (c1 integer);
insert into t2(c1) values (1), (2), (3), (4), (5), (6), (7), (8);
CREATE TABLE cnt(del integer);
INSERT INTO cnt VALUES(0);
CREATE TRIGGER tr1 AFTER DELETE ON t1 FOR EACH ROW
UPDATE cnt SET del=del+1;
CREATE TRIGGER tr2 AFTER DELETE ON t1 FOR EACH ROW
DELETE FROM t2 WHERE c1> (SELECT count(*)-1 FROM t2);
CREATE TABLE tmp as SELECT * FROM t1 WHERE c2>=3;
DELETE FROM t1 WHERE c2>=3;
affected rows: 20
select * from t1;
c1	c2	c3
1	1	1
1	2	2
11	1	11
11	2	12
12	1	14
12	2	15
2	1	4
2	2	5
21	2	21
22	2	24
31	2	31
32	2	34
SELECT * FROM t2;
c1
SELECT * FROM cnt;
del
20
insert into t1(c1,c2,c3) select c1,c2,c3 from tmp;
DROP TRIGGER tr1;
DROP TRIGGER tr2;
drop table t2, cnt, tmp;
#
Delete with a reference to view in subquery
#
create table tmp as select * from t1 where t1.c2 in ( select max(a.c2) from v1 a
where a.c1 = t1.c1);
explain select * from t1 where t1.c2 in ( select max(a.c2) from v1 a
where a.c1 = t1.c1);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	32	Using where
2	DEPENDENT SUBQUERY	t1	ALL	NULL	NULL	NULL	NULL	32	Using where
explain delete from t1 where t1.c2 in ( select max(a.c2) from v1 a
where a.c1 = t1.c1);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	32	Using where
2	DEPENDENT SUBQUERY	t1	ALL	NULL	NULL	NULL	NULL	32	Using where
delete from t1 where t1.c2 in ( select max(a.c2) from v1 a
where a.c1 = t1.c1);
affected rows: 8
select * from t1;
c1	c2	c3
1	1	1
1	3	3
11	1	11
11	3	13
12	1	14
12	3	16
12	4	17
12	5	18
2	1	4
2	3	6
2	4	7
2	5	8
21	3	22
21	4	23
22	3	25
22	4	26
22	5	27
22	6	28
31	3	32
31	4	33
32	3	35
32	4	36
32	5	37
32	6	38
insert into t1(c1,c2,c3) select c1,c2,c3 from tmp;
drop table tmp;
#
# Delete from view
#
analyze table t1 persistent for all;
Table	Op	Msg_type	Msg_text
test.t1	analyze	status	Engine-independent statistics collected
test.t1	analyze	note	The storage engine for the table doesn't support analyze
create table tmp as select * from v1 where v1.c1 in
(select max(a.c1) from t1 a where a.c2 = v1.c2) and c3 = 5;
explain select * from v1 where v1.c1 in
(select max(a.c1) from t1 a where a.c2 = v1.c2) and c3 = 5;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	const	PRIMARY	PRIMARY	4	const	1	
2	DEPENDENT SUBQUERY	a	ALL	NULL	NULL	NULL	NULL	32	Using where
explain delete from v1 where v1.c1 in
(select max(a.c1) from t1 a where a.c2 = v1.c2) and c3 = 5;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	const	PRIMARY	PRIMARY	4	const	1	
2	DEPENDENT SUBQUERY	a	ALL	NULL	NULL	NULL	NULL	32	Using where
delete from v1 where v1.c1 in
(select max(a.c1) from t1 a where a.c2 = v1.c2) and c3 = 5;
affected rows: 0
select * from t1;
c1	c2	c3
1	1	1
1	2	2
1	3	3
11	1	11
11	2	12
11	3	13
12	1	14
12	2	15
12	3	16
12	4	17
12	5	18
2	1	4
2	2	5
2	3	6
2	4	7
2	5	8
21	2	21
21	3	22
21	4	23
22	2	24
22	3	25
22	4	26
22	5	27
22	6	28
31	2	31
31	3	32
31	4	33
32	2	34
32	3	35
32	4	36
32	5	37
32	6	38
insert into t1(c1,c2,c3) select c1,c2,c3 from tmp;
drop table tmp;
#
# Delete from view using reference
# to the same view in subquery
#
analyze table t1 persistent for all;
Table	Op	Msg_type	Msg_text
test.t1	analyze	status	Engine-independent statistics collected
test.t1	analyze	note	The storage engine for the table doesn't support analyze
create table tmp as select * from v1 where v1.c2 in (select max(a.c2) from t1 a where a.c3 = v1.c3)
and c1 = 2
and exists (select 'X' from v1 a where a.c1 = v1.c1);
explain select * from v1 where v1.c2 in (select max(a.c2) from t1 a where a.c3 = v1.c3)
and c1 = 2
and exists (select 'X' from v1 a where a.c1 = v1.c1);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	32	Using where
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	32	Using where; FirstMatch(t1); Using join buffer (flat, BNL join)
2	DEPENDENT SUBQUERY	a	eq_ref	PRIMARY	PRIMARY	4	test.t1.c3	1	
explain delete from v1 where v1.c2 in (select max(a.c2) from t1 a where a.c3 = v1.c3)
and c1 = 2
and exists (select 'X' from v1 a where a.c1 = v1.c1);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	32	Using where
3	DEPENDENT SUBQUERY	t1	ALL	NULL	NULL	NULL	NULL	32	Using where
2	DEPENDENT SUBQUERY	a	eq_ref	PRIMARY	PRIMARY	4	test.t1.c3	1	
delete from v1 where v1.c2 in (select max(a.c2) from t1 a where a.c3 = v1.c3)
and c1 = 2
and exists (select 'X' from v1 a where a.c1 = v1.c1);
affected rows: 1
select * from t1;
c1	c2	c3
1	1	1
1	2	2
1	3	3
11	1	11
11	2	12
11	3	13
12	1	14
12	2	15
12	3	16
12	4	17
12	5	18
2	1	4
2	3	6
2	4	7
2	5	8
21	2	21
21	3	22
21	4	23
22	2	24
22	3	25
22	4	26
22	5	27
22	6	28
31	2	31
31	3	32
31	4	33
32	2	34
32	3	35
32	4	36
32	5	37
32	6	38
insert into t1(c1,c2,c3) select c1,c2,c3 from tmp;
drop table tmp;
drop view v1;
drop table t1;
set @@default_storage_engine=@save_default_engine;
#
# End of 11.0 tests
#