mariadb/mysql-test/r/join_nested.result

DROP TABLE IF EXISTS t0,t1,t2,t3,t4,t5,t6,t7,t8,t9;
CREATE TABLE t0 (a int, b int, c int);
CREATE TABLE t1 (a int, b int, c int);
CREATE TABLE t2 (a int, b int, c int);
CREATE TABLE t3 (a int, b int, c int);
CREATE TABLE t4 (a int, b int, c int);
CREATE TABLE t5 (a int, b int, c int);
CREATE TABLE t6 (a int, b int, c int);
CREATE TABLE t7 (a int, b int, c int);
CREATE TABLE t8 (a int, b int, c int);
CREATE TABLE t9 (a int, b int, c int);
INSERT INTO t0 VALUES (1,1,0), (1,2,0), (2,2,0);
INSERT INTO t1 VALUES (1,3,0), (2,2,0), (3,2,0);
INSERT INTO t2 VALUES (3,3,0), (4,2,0), (5,3,0);
INSERT INTO t3 VALUES (1,2,0), (2,2,0);
INSERT INTO t4 VALUES (3,2,0), (4,2,0);
INSERT INTO t5 VALUES (3,1,0), (2,2,0), (3,3,0);
INSERT INTO t6 VALUES (3,2,0), (6,2,0), (6,1,0);
INSERT INTO t7 VALUES (1,1,0), (2,2,0);
INSERT INTO t8 VALUES (0,2,0), (1,2,0);
INSERT INTO t9 VALUES (1,1,0), (1,2,0), (3,3,0);
SELECT t2.a,t2.b
FROM t2;
a	b
3	3
4	2
5	3
SELECT t3.a,t3.b
FROM t3;
a	b
1	2
2	2
SELECT t4.a,t4.b
FROM t4;
a	b
3	2
4	2
SELECT t3.a,t3.b,t4.a,t4.b
FROM t3,t4;
a	b	a	b
1	2	3	2
2	2	3	2
1	2	4	2
2	2	4	2
SELECT t2.a,t2.b,t3.a,t3.b,t4.a,t4.b
FROM t2
LEFT JOIN              
(t3, t4)
ON t2.b=t4.b;
a	b	a	b	a	b
3	3	NULL	NULL	NULL	NULL
4	2	1	2	3	2
4	2	1	2	4	2
4	2	2	2	3	2
4	2	2	2	4	2
5	3	NULL	NULL	NULL	NULL
SELECT t2.a,t2.b,t3.a,t3.b,t4.a,t4.b
FROM t2
LEFT JOIN              
(t3, t4)
ON t3.a=1 AND t2.b=t4.b;
a	b	a	b	a	b
3	3	NULL	NULL	NULL	NULL
4	2	1	2	3	2
4	2	1	2	4	2
5	3	NULL	NULL	NULL	NULL
EXPLAIN EXTENDED
SELECT t2.a,t2.b,t3.a,t3.b,t4.a,t4.b
FROM t2
LEFT JOIN              
(t3, t4)
ON t2.b=t4.b
WHERE t3.a=1 OR t3.c IS NULL;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	3	
1	SIMPLE	t3	ALL	NULL	NULL	NULL	NULL	2	Using where
1	SIMPLE	t4	ALL	NULL	NULL	NULL	NULL	2	
Warnings:
Note	1003	select `test`.`t2`.`a` AS `a`,`test`.`t2`.`b` AS `b`,`test`.`t3`.`a` AS `a`,`test`.`t3`.`b` AS `b`,`test`.`t4`.`a` AS `a`,`test`.`t4`.`b` AS `b` from `test`.`t2` left join (`test`.`t3` join `test`.`t4`) on((`test`.`t4`.`b` = `test`.`t2`.`b`)) where ((`test`.`t3`.`a` = 1) or isnull(`test`.`t3`.`c`))
SELECT t2.a,t2.b,t3.a,t3.b,t4.a,t4.b
FROM t2
LEFT JOIN              
(t3, t4)
ON t2.b=t4.b
WHERE t3.a=1 OR t3.c IS NULL;
a	b	a	b	a	b
3	3	NULL	NULL	NULL	NULL
4	2	1	2	3	2
4	2	1	2	4	2
5	3	NULL	NULL	NULL	NULL
SELECT t2.a,t2.b,t3.a,t3.b,t4.a,t4.b
FROM t2
LEFT JOIN              
(t3, t4)
ON t2.b=t4.b
WHERE t3.a>1 OR t3.c IS NULL;
a	b	a	b	a	b
3	3	NULL	NULL	NULL	NULL
4	2	2	2	3	2
4	2	2	2	4	2
5	3	NULL	NULL	NULL	NULL
SELECT t5.a,t5.b
FROM t5;
a	b
3	1
2	2
3	3
SELECT t3.a,t3.b,t4.a,t4.b,t5.a,t5.b
FROM t3,t4,t5;
a	b	a	b	a	b
1	2	3	2	3	1
2	2	3	2	3	1
1	2	4	2	3	1
2	2	4	2	3	1
1	2	3	2	2	2
2	2	3	2	2	2
1	2	4	2	2	2
2	2	4	2	2	2
1	2	3	2	3	3
2	2	3	2	3	3
1	2	4	2	3	3
2	2	4	2	3	3
SELECT t2.a,t2.b,t3.a,t3.b,t4.a,t4.b,t5.a,t5.b
FROM t2
LEFT JOIN              
(t3, t4, t5)
ON t2.b=t4.b;
a	b	a	b	a	b	a	b
3	3	NULL	NULL	NULL	NULL	NULL	NULL
4	2	1	2	3	2	3	1
4	2	1	2	3	2	2	2
4	2	1	2	3	2	3	3
4	2	1	2	4	2	3	1
4	2	1	2	4	2	2	2
4	2	1	2	4	2	3	3
4	2	2	2	3	2	3	1
4	2	2	2	3	2	2	2
4	2	2	2	3	2	3	3
4	2	2	2	4	2	3	1
4	2	2	2	4	2	2	2
4	2	2	2	4	2	3	3
5	3	NULL	NULL	NULL	NULL	NULL	NULL
EXPLAIN EXTENDED
SELECT t2.a,t2.b,t3.a,t3.b,t4.a,t4.b,t5.a,t5.b
FROM t2
LEFT JOIN              
(t3, t4, t5)
ON t2.b=t4.b
WHERE t3.a>1 OR t3.c IS NULL;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	3	
1	SIMPLE	t3	ALL	NULL	NULL	NULL	NULL	2	Using where
1	SIMPLE	t4	ALL	NULL	NULL	NULL	NULL	2	
1	SIMPLE	t5	ALL	NULL	NULL	NULL	NULL	3	
Warnings:
Note	1003	select `test`.`t2`.`a` AS `a`,`test`.`t2`.`b` AS `b`,`test`.`t3`.`a` AS `a`,`test`.`t3`.`b` AS `b`,`test`.`t4`.`a` AS `a`,`test`.`t4`.`b` AS `b`,`test`.`t5`.`a` AS `a`,`test`.`t5`.`b` AS `b` from `test`.`t2` left join (`test`.`t3` join `test`.`t4` join `test`.`t5`) on((`test`.`t4`.`b` = `test`.`t2`.`b`)) where ((`test`.`t3`.`a` > 1) or isnull(`test`.`t3`.`c`))
SELECT t2.a,t2.b,t3.a,t3.b,t4.a,t4.b,t5.a,t5.b
FROM t2
LEFT JOIN              
(t3, t4, t5)
ON t2.b=t4.b
WHERE t3.a>1 OR t3.c IS NULL;
a	b	a	b	a	b	a	b
3	3	NULL	NULL	NULL	NULL	NULL	NULL
4	2	2	2	3	2	3	1
4	2	2	2	3	2	2	2
4	2	2	2	3	2	3	3
4	2	2	2	4	2	3	1
4	2	2	2	4	2	2	2
4	2	2	2	4	2	3	3
5	3	NULL	NULL	NULL	NULL	NULL	NULL
EXPLAIN EXTENDED
SELECT t2.a,t2.b,t3.a,t3.b,t4.a,t4.b,t5.a,t5.b
FROM t2
LEFT JOIN              
(t3, t4, t5)
ON t2.b=t4.b
WHERE (t3.a>1 OR t3.c IS NULL) AND 
(t5.a<3 OR t5.c IS NULL);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	3	
1	SIMPLE	t3	ALL	NULL	NULL	NULL	NULL	2	Using where
1	SIMPLE	t4	ALL	NULL	NULL	NULL	NULL	2	
1	SIMPLE	t5	ALL	NULL	NULL	NULL	NULL	3	Using where
Warnings:
Note	1003	select `test`.`t2`.`a` AS `a`,`test`.`t2`.`b` AS `b`,`test`.`t3`.`a` AS `a`,`test`.`t3`.`b` AS `b`,`test`.`t4`.`a` AS `a`,`test`.`t4`.`b` AS `b`,`test`.`t5`.`a` AS `a`,`test`.`t5`.`b` AS `b` from `test`.`t2` left join (`test`.`t3` join `test`.`t4` join `test`.`t5`) on((`test`.`t4`.`b` = `test`.`t2`.`b`)) where (((`test`.`t3`.`a` > 1) or isnull(`test`.`t3`.`c`)) and ((`test`.`t5`.`a` < 3) or isnull(`test`.`t5`.`c`)))
SELECT t2.a,t2.b,t3.a,t3.b,t4.a,t4.b,t5.a,t5.b
FROM t2
LEFT JOIN              
(t3, t4, t5)
ON t2.b=t4.b
WHERE (t3.a>1 OR t3.c IS NULL) AND 
(t5.a<3 OR t5.c IS NULL);
a	b	a	b	a	b	a	b
3	3	NULL	NULL	NULL	NULL	NULL	NULL
4	2	2	2	3	2	2	2
4	2	2	2	4	2	2	2
5	3	NULL	NULL	NULL	NULL	NULL	NULL
SELECT t6.a,t6.b
FROM t6;
a	b
3	2
6	2
6	1
SELECT t7.a,t7.b
FROM t7;
a	b
1	1
2	2
SELECT t6.a,t6.b,t7.a,t7.b
FROM t6,t7;
a	b	a	b
3	2	1	1
3	2	2	2
6	2	1	1
6	2	2	2
6	1	1	1
6	1	2	2
SELECT t8.a,t8.b
FROM t8;
a	b
0	2
1	2
EXPLAIN EXTENDED
SELECT t6.a,t6.b,t7.a,t7.b,t8.a,t8.b
FROM t6,
t7 
LEFT JOIN 
t8
ON t7.b=t8.b AND t6.b < 10;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t7	ALL	NULL	NULL	NULL	NULL	2	
1	SIMPLE	t6	ALL	NULL	NULL	NULL	NULL	3	
1	SIMPLE	t8	ALL	NULL	NULL	NULL	NULL	2	
Warnings:
Note	1003	select `test`.`t6`.`a` AS `a`,`test`.`t6`.`b` AS `b`,`test`.`t7`.`a` AS `a`,`test`.`t7`.`b` AS `b`,`test`.`t8`.`a` AS `a`,`test`.`t8`.`b` AS `b` from `test`.`t6` join `test`.`t7` left join `test`.`t8` on(((`test`.`t7`.`b` = `test`.`t8`.`b`) and (`test`.`t6`.`b` < 10))) where 1
SELECT t6.a,t6.b,t7.a,t7.b,t8.a,t8.b
FROM t6,
t7 
LEFT JOIN 
t8
ON t7.b=t8.b AND t6.b < 10;
a	b	a	b	a	b
3	2	1	1	NULL	NULL
3	2	2	2	0	2
3	2	2	2	1	2
6	2	1	1	NULL	NULL
6	2	2	2	0	2
6	2	2	2	1	2
6	1	1	1	NULL	NULL
6	1	2	2	0	2
6	1	2	2	1	2
SELECT t5.a,t5.b
FROM t5;
a	b
3	1
2	2
3	3
SELECT t5.a,t5.b,t6.a,t6.b,t7.a,t7.b,t8.a,t8.b
FROM t5 
LEFT JOIN 
( 
t6,
t7 
LEFT JOIN 
t8
ON t7.b=t8.b AND t6.b < 10
)
ON t6.b >= 2 AND t5.b=t7.b;
a	b	a	b	a	b	a	b
3	1	3	2	1	1	NULL	NULL
3	1	6	2	1	1	NULL	NULL
2	2	3	2	2	2	0	2
2	2	3	2	2	2	1	2
2	2	6	2	2	2	0	2
2	2	6	2	2	2	1	2
3	3	NULL	NULL	NULL	NULL	NULL	NULL
SELECT t5.a,t5.b,t6.a,t6.b,t7.a,t7.b,t8.a,t8.b
FROM t5 
LEFT JOIN 
( 
t6,
t7 
LEFT JOIN 
t8
ON t7.b=t8.b AND t6.b < 10
)
ON t6.b >= 2 AND t5.b=t7.b AND
(t8.a < 1 OR t8.c IS NULL);
a	b	a	b	a	b	a	b
3	1	3	2	1	1	NULL	NULL
3	1	6	2	1	1	NULL	NULL
2	2	3	2	2	2	0	2
2	2	6	2	2	2	0	2
3	3	NULL	NULL	NULL	NULL	NULL	NULL
SELECT t2.a,t2.b,t3.a,t3.b,t4.a,t4.b
FROM t2
LEFT JOIN              
(t3, t4)
ON t3.a=1 AND t2.b=t4.b;
a	b	a	b	a	b
3	3	NULL	NULL	NULL	NULL
4	2	1	2	3	2
4	2	1	2	4	2
5	3	NULL	NULL	NULL	NULL
SELECT t2.a,t2.b,t3.a,t3.b,t4.a,t4.b,
t5.a,t5.b,t6.a,t6.b,t7.a,t7.b,t8.a,t8.b
FROM t2
LEFT JOIN              
(t3, t4)
ON t3.a=1 AND t2.b=t4.b,
t5 
LEFT JOIN 
( 
t6,
t7 
LEFT JOIN 
t8
ON t7.b=t8.b AND t6.b < 10
)
ON t6.b >= 2 AND t5.b=t7.b;
a	b	a	b	a	b	a	b	a	b	a	b	a	b
3	3	NULL	NULL	NULL	NULL	3	1	3	2	1	1	NULL	NULL
3	3	NULL	NULL	NULL	NULL	3	1	6	2	1	1	NULL	NULL
4	2	1	2	3	2	3	1	3	2	1	1	NULL	NULL
4	2	1	2	3	2	3	1	6	2	1	1	NULL	NULL
4	2	1	2	4	2	3	1	3	2	1	1	NULL	NULL
4	2	1	2	4	2	3	1	6	2	1	1	NULL	NULL
5	3	NULL	NULL	NULL	NULL	3	1	3	2	1	1	NULL	NULL
5	3	NULL	NULL	NULL	NULL	3	1	6	2	1	1	NULL	NULL
3	3	NULL	NULL	NULL	NULL	2	2	3	2	2	2	0	2
3	3	NULL	NULL	NULL	NULL	2	2	3	2	2	2	1	2
3	3	NULL	NULL	NULL	NULL	2	2	6	2	2	2	0	2
3	3	NULL	NULL	NULL	NULL	2	2	6	2	2	2	1	2
4	2	1	2	3	2	2	2	3	2	2	2	0	2
4	2	1	2	3	2	2	2	3	2	2	2	1	2
4	2	1	2	3	2	2	2	6	2	2	2	0	2
4	2	1	2	3	2	2	2	6	2	2	2	1	2
4	2	1	2	4	2	2	2	3	2	2	2	0	2
4	2	1	2	4	2	2	2	3	2	2	2	1	2
4	2	1	2	4	2	2	2	6	2	2	2	0	2
4	2	1	2	4	2	2	2	6	2	2	2	1	2
5	3	NULL	NULL	NULL	NULL	2	2	3	2	2	2	0	2
5	3	NULL	NULL	NULL	NULL	2	2	3	2	2	2	1	2
5	3	NULL	NULL	NULL	NULL	2	2	6	2	2	2	0	2
5	3	NULL	NULL	NULL	NULL	2	2	6	2	2	2	1	2
3	3	NULL	NULL	NULL	NULL	3	3	NULL	NULL	NULL	NULL	NULL	NULL
4	2	1	2	3	2	3	3	NULL	NULL	NULL	NULL	NULL	NULL
4	2	1	2	4	2	3	3	NULL	NULL	NULL	NULL	NULL	NULL
5	3	NULL	NULL	NULL	NULL	3	3	NULL	NULL	NULL	NULL	NULL	NULL
SELECT t2.a,t2.b,t3.a,t3.b,t4.a,t4.b,
t5.a,t5.b,t6.a,t6.b,t7.a,t7.b,t8.a,t8.b
FROM t2
LEFT JOIN              
(t3, t4)
ON t3.a=1 AND t2.b=t4.b,
t5 
LEFT JOIN 
( 
t6,
t7 
LEFT JOIN 
t8
ON t7.b=t8.b AND t6.b < 10
)
ON t6.b >= 2 AND t5.b=t7.b
WHERE t2.a > 3 AND
(t6.a < 6 OR t6.c IS NULL);
a	b	a	b	a	b	a	b	a	b	a	b	a	b
4	2	1	2	3	2	3	1	3	2	1	1	NULL	NULL
4	2	1	2	4	2	3	1	3	2	1	1	NULL	NULL
5	3	NULL	NULL	NULL	NULL	3	1	3	2	1	1	NULL	NULL
4	2	1	2	3	2	2	2	3	2	2	2	0	2
4	2	1	2	3	2	2	2	3	2	2	2	1	2
4	2	1	2	4	2	2	2	3	2	2	2	0	2
4	2	1	2	4	2	2	2	3	2	2	2	1	2
5	3	NULL	NULL	NULL	NULL	2	2	3	2	2	2	0	2
5	3	NULL	NULL	NULL	NULL	2	2	3	2	2	2	1	2
4	2	1	2	3	2	3	3	NULL	NULL	NULL	NULL	NULL	NULL
4	2	1	2	4	2	3	3	NULL	NULL	NULL	NULL	NULL	NULL
5	3	NULL	NULL	NULL	NULL	3	3	NULL	NULL	NULL	NULL	NULL	NULL
SELECT t1.a,t1.b
FROM t1;
a	b
1	3
2	2
3	2
SELECT t1.a,t1.b,t2.a,t2.b,t3.a,t3.b,t4.a,t4.b,
t5.a,t5.b,t6.a,t6.b,t7.a,t7.b,t8.a,t8.b
FROM t1
LEFT JOIN                
( 
t2
LEFT JOIN              
(t3, t4)
ON t3.a=1 AND t2.b=t4.b,
t5 
LEFT JOIN 
( 
t6,
t7 
LEFT JOIN 
t8
ON t7.b=t8.b AND t6.b < 10
)
ON t6.b >= 2 AND t5.b=t7.b 
)
ON (t3.b=2 OR t3.c IS NULL) AND (t6.b=2 OR t6.c IS NULL) AND
(t1.b=t5.b OR t3.c IS NULL OR t6.c IS NULL or t8.c IS NULL) AND
(t1.a != 2);
a	b	a	b	a	b	a	b	a	b	a	b	a	b	a	b
1	3	3	3	NULL	NULL	NULL	NULL	3	1	3	2	1	1	NULL	NULL
1	3	3	3	NULL	NULL	NULL	NULL	3	1	6	2	1	1	NULL	NULL
1	3	3	3	NULL	NULL	NULL	NULL	2	2	3	2	2	2	0	2
1	3	3	3	NULL	NULL	NULL	NULL	2	2	3	2	2	2	1	2
1	3	3	3	NULL	NULL	NULL	NULL	2	2	6	2	2	2	0	2
1	3	3	3	NULL	NULL	NULL	NULL	2	2	6	2	2	2	1	2
1	3	3	3	NULL	NULL	NULL	NULL	3	3	NULL	NULL	NULL	NULL	NULL	NULL
1	3	4	2	1	2	3	2	3	1	3	2	1	1	NULL	NULL
1	3	4	2	1	2	3	2	3	1	6	2	1	1	NULL	NULL
1	3	4	2	1	2	3	2	3	3	NULL	NULL	NULL	NULL	NULL	NULL
1	3	4	2	1	2	4	2	3	1	3	2	1	1	NULL	NULL
1	3	4	2	1	2	4	2	3	1	6	2	1	1	NULL	NULL
1	3	4	2	1	2	4	2	3	3	NULL	NULL	NULL	NULL	NULL	NULL
1	3	5	3	NULL	NULL	NULL	NULL	3	1	3	2	1	1	NULL	NULL
1	3	5	3	NULL	NULL	NULL	NULL	3	1	6	2	1	1	NULL	NULL
1	3	5	3	NULL	NULL	NULL	NULL	2	2	3	2	2	2	0	2
1	3	5	3	NULL	NULL	NULL	NULL	2	2	3	2	2	2	1	2
1	3	5	3	NULL	NULL	NULL	NULL	2	2	6	2	2	2	0	2
1	3	5	3	NULL	NULL	NULL	NULL	2	2	6	2	2	2	1	2
1	3	5	3	NULL	NULL	NULL	NULL	3	3	NULL	NULL	NULL	NULL	NULL	NULL
2	2	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL
3	2	3	3	NULL	NULL	NULL	NULL	3	1	3	2	1	1	NULL	NULL
3	2	3	3	NULL	NULL	NULL	NULL	3	1	6	2	1	1	NULL	NULL
3	2	3	3	NULL	NULL	NULL	NULL	2	2	3	2	2	2	0	2
3	2	3	3	NULL	NULL	NULL	NULL	2	2	3	2	2	2	1	2
3	2	3	3	NULL	NULL	NULL	NULL	2	2	6	2	2	2	0	2
3	2	3	3	NULL	NULL	NULL	NULL	2	2	6	2	2	2	1	2
3	2	3	3	NULL	NULL	NULL	NULL	3	3	NULL	NULL	NULL	NULL	NULL	NULL
3	2	4	2	1	2	3	2	3	1	3	2	1	1	NULL	NULL
3	2	4	2	1	2	3	2	3	1	6	2	1	1	NULL	NULL
3	2	4	2	1	2	3	2	2	2	3	2	2	2	0	2
3	2	4	2	1	2	3	2	2	2	3	2	2	2	1	2
3	2	4	2	1	2	3	2	2	2	6	2	2	2	0	2
3	2	4	2	1	2	3	2	2	2	6	2	2	2	1	2
3	2	4	2	1	2	3	2	3	3	NULL	NULL	NULL	NULL	NULL	NULL
3	2	4	2	1	2	4	2	3	1	3	2	1	1	NULL	NULL
3	2	4	2	1	2	4	2	3	1	6	2	1	1	NULL	NULL
3	2	4	2	1	2	4	2	2	2	3	2	2	2	0	2
3	2	4	2	1	2	4	2	2	2	3	2	2	2	1	2
3	2	4	2	1	2	4	2	2	2	6	2	2	2	0	2
3	2	4	2	1	2	4	2	2	2	6	2	2	2	1	2
3	2	4	2	1	2	4	2	3	3	NULL	NULL	NULL	NULL	NULL	NULL
3	2	5	3	NULL	NULL	NULL	NULL	3	1	3	2	1	1	NULL	NULL
3	2	5	3	NULL	NULL	NULL	NULL	3	1	6	2	1	1	NULL	NULL
3	2	5	3	NULL	NULL	NULL	NULL	2	2	3	2	2	2	0	2
3	2	5	3	NULL	NULL	NULL	NULL	2	2	3	2	2	2	1	2
3	2	5	3	NULL	NULL	NULL	NULL	2	2	6	2	2	2	0	2
3	2	5	3	NULL	NULL	NULL	NULL	2	2	6	2	2	2	1	2
3	2	5	3	NULL	NULL	NULL	NULL	3	3	NULL	NULL	NULL	NULL	NULL	NULL
SELECT t1.a,t1.b,t2.a,t2.b,t3.a,t3.b,t4.a,t4.b,
t5.a,t5.b,t6.a,t6.b,t7.a,t7.b,t8.a,t8.b
FROM t1
LEFT JOIN                
( 
t2
LEFT JOIN              
(t3, t4)
ON t3.a=1 AND t2.b=t4.b,
t5 
LEFT JOIN 
( 
t6,
t7 
LEFT JOIN 
t8
ON t7.b=t8.b AND t6.b < 10
)
ON t6.b >= 2 AND t5.b=t7.b 
)
ON (t3.b=2 OR t3.c IS NULL) AND (t6.b=2 OR t6.c IS NULL) AND
(t1.b=t5.b OR t3.c IS NULL OR t6.c IS NULL or t8.c IS NULL) AND
(t1.a != 2)
WHERE (t2.a >= 4 OR t2.c IS NULL);
a	b	a	b	a	b	a	b	a	b	a	b	a	b	a	b
1	3	4	2	1	2	3	2	3	1	3	2	1	1	NULL	NULL
1	3	4	2	1	2	3	2	3	1	6	2	1	1	NULL	NULL
1	3	4	2	1	2	3	2	3	3	NULL	NULL	NULL	NULL	NULL	NULL
1	3	4	2	1	2	4	2	3	1	3	2	1	1	NULL	NULL
1	3	4	2	1	2	4	2	3	1	6	2	1	1	NULL	NULL
1	3	4	2	1	2	4	2	3	3	NULL	NULL	NULL	NULL	NULL	NULL
1	3	5	3	NULL	NULL	NULL	NULL	3	1	3	2	1	1	NULL	NULL
1	3	5	3	NULL	NULL	NULL	NULL	3	1	6	2	1	1	NULL	NULL
1	3	5	3	NULL	NULL	NULL	NULL	2	2	3	2	2	2	0	2
1	3	5	3	NULL	NULL	NULL	NULL	2	2	3	2	2	2	1	2
1	3	5	3	NULL	NULL	NULL	NULL	2	2	6	2	2	2	0	2
1	3	5	3	NULL	NULL	NULL	NULL	2	2	6	2	2	2	1	2
1	3	5	3	NULL	NULL	NULL	NULL	3	3	NULL	NULL	NULL	NULL	NULL	NULL
2	2	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL
3	2	4	2	1	2	3	2	3	1	3	2	1	1	NULL	NULL
3	2	4	2	1	2	3	2	3	1	6	2	1	1	NULL	NULL
3	2	4	2	1	2	3	2	2	2	3	2	2	2	0	2
3	2	4	2	1	2	3	2	2	2	3	2	2	2	1	2
3	2	4	2	1	2	3	2	2	2	6	2	2	2	0	2
3	2	4	2	1	2	3	2	2	2	6	2	2	2	1	2
3	2	4	2	1	2	3	2	3	3	NULL	NULL	NULL	NULL	NULL	NULL
3	2	4	2	1	2	4	2	3	1	3	2	1	1	NULL	NULL
3	2	4	2	1	2	4	2	3	1	6	2	1	1	NULL	NULL
3	2	4	2	1	2	4	2	2	2	3	2	2	2	0	2
3	2	4	2	1	2	4	2	2	2	3	2	2	2	1	2
3	2	4	2	1	2	4	2	2	2	6	2	2	2	0	2
3	2	4	2	1	2	4	2	2	2	6	2	2	2	1	2
3	2	4	2	1	2	4	2	3	3	NULL	NULL	NULL	NULL	NULL	NULL
3	2	5	3	NULL	NULL	NULL	NULL	3	1	3	2	1	1	NULL	NULL
3	2	5	3	NULL	NULL	NULL	NULL	3	1	6	2	1	1	NULL	NULL
3	2	5	3	NULL	NULL	NULL	NULL	2	2	3	2	2	2	0	2
3	2	5	3	NULL	NULL	NULL	NULL	2	2	3	2	2	2	1	2
3	2	5	3	NULL	NULL	NULL	NULL	2	2	6	2	2	2	0	2
3	2	5	3	NULL	NULL	NULL	NULL	2	2	6	2	2	2	1	2
3	2	5	3	NULL	NULL	NULL	NULL	3	3	NULL	NULL	NULL	NULL	NULL	NULL
SELECT t0.a,t0.b
FROM t0;
a	b
1	1
1	2
2	2
EXPLAIN EXTENDED
SELECT t0.a,t0.b,t1.a,t1.b,t2.a,t2.b,t3.a,t3.b,t4.a,t4.b,
t5.a,t5.b,t6.a,t6.b,t7.a,t7.b,t8.a,t8.b
FROM t0,t1
LEFT JOIN                
( 
t2
LEFT JOIN              
(t3, t4)
ON t3.a=1 AND t2.b=t4.b,
t5 
LEFT JOIN 
( 
t6,
t7 
LEFT JOIN 
t8
ON t7.b=t8.b AND t6.b < 10
)
ON t6.b >= 2 AND t5.b=t7.b 
)
ON (t3.b=2 OR t3.c IS NULL) AND (t6.b=2 OR t6.c IS NULL) AND
(t1.b=t5.b OR t3.c IS NULL OR t6.c IS NULL or t8.c IS NULL) AND
(t1.a != 2)
WHERE t0.a=1 AND
t0.b=t1.b AND          
(t2.a >= 4 OR t2.c IS NULL);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t0	ALL	NULL	NULL	NULL	NULL	3	Using where
1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	3	Using where
1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	3	Using where
1	SIMPLE	t3	ALL	NULL	NULL	NULL	NULL	2	
1	SIMPLE	t4	ALL	NULL	NULL	NULL	NULL	2	
1	SIMPLE	t5	ALL	NULL	NULL	NULL	NULL	3	
1	SIMPLE	t7	ALL	NULL	NULL	NULL	NULL	2	
1	SIMPLE	t6	ALL	NULL	NULL	NULL	NULL	3	
1	SIMPLE	t8	ALL	NULL	NULL	NULL	NULL	2	
Warnings:
Note	1003	select `test`.`t0`.`a` AS `a`,`test`.`t0`.`b` AS `b`,`test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b`,`test`.`t2`.`a` AS `a`,`test`.`t2`.`b` AS `b`,`test`.`t3`.`a` AS `a`,`test`.`t3`.`b` AS `b`,`test`.`t4`.`a` AS `a`,`test`.`t4`.`b` AS `b`,`test`.`t5`.`a` AS `a`,`test`.`t5`.`b` AS `b`,`test`.`t6`.`a` AS `a`,`test`.`t6`.`b` AS `b`,`test`.`t7`.`a` AS `a`,`test`.`t7`.`b` AS `b`,`test`.`t8`.`a` AS `a`,`test`.`t8`.`b` AS `b` from `test`.`t0` join `test`.`t1` left join (`test`.`t2` left join (`test`.`t3` join `test`.`t4`) on(((`test`.`t4`.`b` = `test`.`t2`.`b`) and (`test`.`t3`.`a` = 1))) join `test`.`t5` left join (`test`.`t6` join `test`.`t7` left join `test`.`t8` on(((`test`.`t8`.`b` = `test`.`t5`.`b`) and (`test`.`t6`.`b` < 10)))) on(((`test`.`t7`.`b` = `test`.`t5`.`b`) and (`test`.`t6`.`b` >= 2)))) on((((`test`.`t3`.`b` = 2) or isnull(`test`.`t3`.`c`)) and ((`test`.`t6`.`b` = 2) or isnull(`test`.`t6`.`c`)) and ((`test`.`t5`.`b` = `test`.`t0`.`b`) or isnull(`test`.`t3`.`c`) or isnull(`test`.`t6`.`c`) or isnull(`test`.`t8`.`c`)) and (`test`.`t1`.`a` <> 2))) where ((`test`.`t1`.`b` = `test`.`t0`.`b`) and (`test`.`t0`.`a` = 1) and ((`test`.`t2`.`a` >= 4) or isnull(`test`.`t2`.`c`)))
SELECT t0.a,t0.b,t1.a,t1.b,t2.a,t2.b,t3.a,t3.b,t4.a,t4.b,
t5.a,t5.b,t6.a,t6.b,t7.a,t7.b,t8.a,t8.b
FROM t0,t1
LEFT JOIN                
( 
t2
LEFT JOIN              
(t3, t4)
ON t3.a=1 AND t2.b=t4.b,
t5 
LEFT JOIN 
( 
t6,
t7 
LEFT JOIN 
t8
ON t7.b=t8.b AND t6.b < 10
)
ON t6.b >= 2 AND t5.b=t7.b 
)
ON (t3.b=2 OR t3.c IS NULL) AND (t6.b=2 OR t6.c IS NULL) AND
(t1.b=t5.b OR t3.c IS NULL OR t6.c IS NULL or t8.c IS NULL) AND
(t1.a != 2)
WHERE t0.a=1 AND
t0.b=t1.b AND          
(t2.a >= 4 OR t2.c IS NULL);
a	b	a	b	a	b	a	b	a	b	a	b	a	b	a	b	a	b
1	2	2	2	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL
1	2	3	2	4	2	1	2	3	2	3	1	3	2	1	1	NULL	NULL
1	2	3	2	4	2	1	2	3	2	3	1	6	2	1	1	NULL	NULL
1	2	3	2	4	2	1	2	3	2	2	2	3	2	2	2	0	2
1	2	3	2	4	2	1	2	3	2	2	2	3	2	2	2	1	2
1	2	3	2	4	2	1	2	3	2	2	2	6	2	2	2	0	2
1	2	3	2	4	2	1	2	3	2	2	2	6	2	2	2	1	2
1	2	3	2	4	2	1	2	3	2	3	3	NULL	NULL	NULL	NULL	NULL	NULL
1	2	3	2	4	2	1	2	4	2	3	1	3	2	1	1	NULL	NULL
1	2	3	2	4	2	1	2	4	2	3	1	6	2	1	1	NULL	NULL
1	2	3	2	4	2	1	2	4	2	2	2	3	2	2	2	0	2
1	2	3	2	4	2	1	2	4	2	2	2	3	2	2	2	1	2
1	2	3	2	4	2	1	2	4	2	2	2	6	2	2	2	0	2
1	2	3	2	4	2	1	2	4	2	2	2	6	2	2	2	1	2
1	2	3	2	4	2	1	2	4	2	3	3	NULL	NULL	NULL	NULL	NULL	NULL
1	2	3	2	5	3	NULL	NULL	NULL	NULL	3	1	3	2	1	1	NULL	NULL
1	2	3	2	5	3	NULL	NULL	NULL	NULL	3	1	6	2	1	1	NULL	NULL
1	2	3	2	5	3	NULL	NULL	NULL	NULL	2	2	3	2	2	2	0	2
1	2	3	2	5	3	NULL	NULL	NULL	NULL	2	2	3	2	2	2	1	2
1	2	3	2	5	3	NULL	NULL	NULL	NULL	2	2	6	2	2	2	0	2
1	2	3	2	5	3	NULL	NULL	NULL	NULL	2	2	6	2	2	2	1	2
1	2	3	2	5	3	NULL	NULL	NULL	NULL	3	3	NULL	NULL	NULL	NULL	NULL	NULL
EXPLAIN EXTENDED
SELECT t0.a,t0.b,t1.a,t1.b,t2.a,t2.b,t3.a,t3.b,t4.a,t4.b,
t5.a,t5.b,t6.a,t6.b,t7.a,t7.b,t8.a,t8.b,t9.a,t9.b
FROM t0,t1
LEFT JOIN                
( 
t2
LEFT JOIN              
(t3, t4)
ON t3.a=1 AND t2.b=t4.b,
t5 
LEFT JOIN 
( 
t6,
t7 
LEFT JOIN 
t8
ON t7.b=t8.b AND t6.b < 10
)
ON t6.b >= 2 AND t5.b=t7.b 
)
ON (t3.b=2 OR t3.c IS NULL) AND (t6.b=2 OR t6.c IS NULL) AND
(t1.b=t5.b OR t3.c IS NULL OR t6.c IS NULL or t8.c IS NULL) AND
(t1.a != 2),
t9
WHERE t0.a=1 AND
t0.b=t1.b AND          
(t2.a >= 4 OR t2.c IS NULL) AND
(t3.a < 5 OR t3.c IS NULL) AND
(t3.b=t4.b OR t3.c IS NULL OR t4.c IS NULL) AND
(t5.a >=2 OR t5.c IS NULL) AND
(t6.a >=4 OR t6.c IS NULL) AND
(t7.a <= 2 OR t7.c IS NULL) AND
(t8.a < 1 OR t8.c IS NULL) AND
(t8.b=t9.b OR t8.c IS NULL) AND
(t9.a=1);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t0	ALL	NULL	NULL	NULL	NULL	3	Using where
1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	3	Using where
1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	3	Using where
1	SIMPLE	t3	ALL	NULL	NULL	NULL	NULL	2	Using where
1	SIMPLE	t4	ALL	NULL	NULL	NULL	NULL	2	Using where
1	SIMPLE	t5	ALL	NULL	NULL	NULL	NULL	3	Using where
1	SIMPLE	t7	ALL	NULL	NULL	NULL	NULL	2	Using where
1	SIMPLE	t6	ALL	NULL	NULL	NULL	NULL	3	Using where
1	SIMPLE	t8	ALL	NULL	NULL	NULL	NULL	2	Using where
1	SIMPLE	t9	ALL	NULL	NULL	NULL	NULL	3	Using where
Warnings:
Note	1003	select `test`.`t0`.`a` AS `a`,`test`.`t0`.`b` AS `b`,`test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b`,`test`.`t2`.`a` AS `a`,`test`.`t2`.`b` AS `b`,`test`.`t3`.`a` AS `a`,`test`.`t3`.`b` AS `b`,`test`.`t4`.`a` AS `a`,`test`.`t4`.`b` AS `b`,`test`.`t5`.`a` AS `a`,`test`.`t5`.`b` AS `b`,`test`.`t6`.`a` AS `a`,`test`.`t6`.`b` AS `b`,`test`.`t7`.`a` AS `a`,`test`.`t7`.`b` AS `b`,`test`.`t8`.`a` AS `a`,`test`.`t8`.`b` AS `b`,`test`.`t9`.`a` AS `a`,`test`.`t9`.`b` AS `b` from `test`.`t0` join `test`.`t1` left join (`test`.`t2` left join (`test`.`t3` join `test`.`t4`) on(((`test`.`t4`.`b` = `test`.`t2`.`b`) and (`test`.`t3`.`a` = 1))) join `test`.`t5` left join (`test`.`t6` join `test`.`t7` left join `test`.`t8` on(((`test`.`t8`.`b` = `test`.`t5`.`b`) and (`test`.`t6`.`b` < 10)))) on(((`test`.`t7`.`b` = `test`.`t5`.`b`) and (`test`.`t6`.`b` >= 2)))) on((((`test`.`t3`.`b` = 2) or isnull(`test`.`t3`.`c`)) and ((`test`.`t6`.`b` = 2) or isnull(`test`.`t6`.`c`)) and ((`test`.`t5`.`b` = `test`.`t0`.`b`) or isnull(`test`.`t3`.`c`) or isnull(`test`.`t6`.`c`) or isnull(`test`.`t8`.`c`)) and (`test`.`t1`.`a` <> 2))) join `test`.`t9` where ((`test`.`t9`.`a` = 1) and (`test`.`t1`.`b` = `test`.`t0`.`b`) and (`test`.`t0`.`a` = 1) and ((`test`.`t2`.`a` >= 4) or isnull(`test`.`t2`.`c`)) and ((`test`.`t3`.`a` < 5) or isnull(`test`.`t3`.`c`)) and ((`test`.`t4`.`b` = `test`.`t3`.`b`) or isnull(`test`.`t3`.`c`) or isnull(`test`.`t4`.`c`)) and ((`test`.`t5`.`a` >= 2) or isnull(`test`.`t5`.`c`)) and ((`test`.`t6`.`a` >= 4) or isnull(`test`.`t6`.`c`)) and ((`test`.`t7`.`a` <= 2) or isnull(`test`.`t7`.`c`)) and ((`test`.`t8`.`a` < 1) or isnull(`test`.`t8`.`c`)) and ((`test`.`t9`.`b` = `test`.`t8`.`b`) or isnull(`test`.`t8`.`c`)))
SELECT t9.a,t9.b
FROM t9;
a	b
1	1
1	2
3	3
SELECT t0.a,t0.b,t1.a,t1.b,t2.a,t2.b,t3.a,t3.b,t4.a,t4.b,
t5.a,t5.b,t6.a,t6.b,t7.a,t7.b,t8.a,t8.b,t9.a,t9.b
FROM t0,t1
LEFT JOIN                
( 
t2
LEFT JOIN              
(t3, t4)
ON t3.a=1 AND t2.b=t4.b,
t5 
LEFT JOIN 
( 
t6,
t7 
LEFT JOIN 
t8
ON t7.b=t8.b AND t6.b < 10
)
ON t6.b >= 2 AND t5.b=t7.b 
)
ON (t3.b=2 OR t3.c IS NULL) AND (t6.b=2 OR t6.c IS NULL) AND
(t1.b=t5.b OR t3.c IS NULL OR t6.c IS NULL or t8.c IS NULL) AND
(t1.a != 2),
t9
WHERE t0.a=1 AND
t0.b=t1.b AND          
(t2.a >= 4 OR t2.c IS NULL) AND
(t3.a < 5 OR t3.c IS NULL) AND
(t3.b=t4.b OR t3.c IS NULL OR t4.c IS NULL) AND
(t5.a >=2 OR t5.c IS NULL) AND
(t6.a >=4 OR t6.c IS NULL) AND
(t7.a <= 2 OR t7.c IS NULL) AND
(t8.a < 1 OR t8.c IS NULL) AND
(t8.b=t9.b OR t8.c IS NULL) AND
(t9.a=1);
a	b	a	b	a	b	a	b	a	b	a	b	a	b	a	b	a	b	a	b
1	2	2	2	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	1	1
1	2	3	2	4	2	1	2	3	2	3	1	6	2	1	1	NULL	NULL	1	1
1	2	3	2	4	2	1	2	3	2	3	3	NULL	NULL	NULL	NULL	NULL	NULL	1	1
1	2	3	2	4	2	1	2	4	2	3	1	6	2	1	1	NULL	NULL	1	1
1	2	3	2	4	2	1	2	4	2	3	3	NULL	NULL	NULL	NULL	NULL	NULL	1	1
1	2	3	2	5	3	NULL	NULL	NULL	NULL	3	1	6	2	1	1	NULL	NULL	1	1
1	2	3	2	5	3	NULL	NULL	NULL	NULL	3	3	NULL	NULL	NULL	NULL	NULL	NULL	1	1
1	2	2	2	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	1	2
1	2	3	2	4	2	1	2	3	2	3	1	6	2	1	1	NULL	NULL	1	2
1	2	3	2	4	2	1	2	3	2	2	2	6	2	2	2	0	2	1	2
1	2	3	2	4	2	1	2	3	2	3	3	NULL	NULL	NULL	NULL	NULL	NULL	1	2
1	2	3	2	4	2	1	2	4	2	3	1	6	2	1	1	NULL	NULL	1	2
1	2	3	2	4	2	1	2	4	2	2	2	6	2	2	2	0	2	1	2
1	2	3	2	4	2	1	2	4	2	3	3	NULL	NULL	NULL	NULL	NULL	NULL	1	2
1	2	3	2	5	3	NULL	NULL	NULL	NULL	3	1	6	2	1	1	NULL	NULL	1	2
1	2	3	2	5	3	NULL	NULL	NULL	NULL	2	2	6	2	2	2	0	2	1	2
1	2	3	2	5	3	NULL	NULL	NULL	NULL	3	3	NULL	NULL	NULL	NULL	NULL	NULL	1	2
SELECT t1.a,t1.b
FROM t1;
a	b
1	3
2	2
3	2
SELECT t2.a,t2.b
FROM t2;
a	b
3	3
4	2
5	3
SELECT t3.a,t3.b
FROM t3;
a	b
1	2
2	2
SELECT t2.a,t2.b,t3.a,t3.b
FROM t2 
LEFT JOIN              
t3
ON t2.b=t3.b;
a	b	a	b
3	3	NULL	NULL
4	2	1	2
4	2	2	2
5	3	NULL	NULL
SELECT t1.a,t1.b,t2.a,t2.b,t3.a,t3.b
FROM t1, t2 
LEFT JOIN              
t3
ON t2.b=t3.b
WHERE t1.a <= 2;
a	b	a	b	a	b
1	3	3	3	NULL	NULL
2	2	3	3	NULL	NULL
1	3	4	2	1	2
1	3	4	2	2	2
2	2	4	2	1	2
2	2	4	2	2	2
1	3	5	3	NULL	NULL
2	2	5	3	NULL	NULL
SELECT t1.a,t1.b,t2.a,t2.b,t3.a,t3.b
FROM t1, t3 
RIGHT JOIN              
t2
ON t2.b=t3.b
WHERE t1.a <= 2;
a	b	a	b	a	b
1	3	3	3	NULL	NULL
2	2	3	3	NULL	NULL
1	3	4	2	1	2
1	3	4	2	2	2
2	2	4	2	1	2
2	2	4	2	2	2
1	3	5	3	NULL	NULL
2	2	5	3	NULL	NULL
SELECT t3.a,t3.b,t4.a,t4.b
FROM t3,t4;
a	b	a	b
1	2	3	2
2	2	3	2
1	2	4	2
2	2	4	2
SELECT t2.a,t2.b,t3.a,t3.b,t4.a,t4.b
FROM t2 
LEFT JOIN              
(t3, t4)
ON t3.a=1 AND t2.b=t4.b;
a	b	a	b	a	b
3	3	NULL	NULL	NULL	NULL
4	2	1	2	3	2
4	2	1	2	4	2
5	3	NULL	NULL	NULL	NULL
SELECT t1.a,t1.b,t2.a,t2.b,t3.a,t3.b,t4.a,t4.b
FROM t1, t2 
LEFT JOIN              
(t3, t4)
ON t3.a=1 AND t2.b=t4.b
WHERE t1.a <= 2;
a	b	a	b	a	b	a	b
1	3	3	3	NULL	NULL	NULL	NULL
2	2	3	3	NULL	NULL	NULL	NULL
1	3	4	2	1	2	3	2
1	3	4	2	1	2	4	2
2	2	4	2	1	2	3	2
2	2	4	2	1	2	4	2
1	3	5	3	NULL	NULL	NULL	NULL
2	2	5	3	NULL	NULL	NULL	NULL
SELECT t1.a,t1.b,t2.a,t2.b,t3.a,t3.b,t4.a,t4.b
FROM t1, (t3, t4) 
RIGHT JOIN              
t2
ON t3.a=1 AND t2.b=t4.b
WHERE t1.a <= 2;
a	b	a	b	a	b	a	b
1	3	3	3	NULL	NULL	NULL	NULL
2	2	3	3	NULL	NULL	NULL	NULL
1	3	4	2	1	2	3	2
1	3	4	2	1	2	4	2
2	2	4	2	1	2	3	2
2	2	4	2	1	2	4	2
1	3	5	3	NULL	NULL	NULL	NULL
2	2	5	3	NULL	NULL	NULL	NULL
SELECT t1.a,t1.b,t2.a,t2.b,t3.a,t3.b,t4.a,t4.b
FROM t1, t3, t4 
RIGHT JOIN              
t2
ON t3.a=1 AND t2.b=t4.b
WHERE t1.a <= 2;
a	b	a	b	a	b	a	b
1	3	3	3	1	2	NULL	NULL
1	3	3	3	2	2	NULL	NULL
2	2	3	3	1	2	NULL	NULL
2	2	3	3	2	2	NULL	NULL
1	3	4	2	1	2	3	2
1	3	4	2	1	2	4	2
1	3	4	2	2	2	NULL	NULL
2	2	4	2	1	2	3	2
2	2	4	2	1	2	4	2
2	2	4	2	2	2	NULL	NULL
1	3	5	3	1	2	NULL	NULL
1	3	5	3	2	2	NULL	NULL
2	2	5	3	1	2	NULL	NULL
2	2	5	3	2	2	NULL	NULL
EXPLAIN EXTENDED
SELECT t1.a,t1.b,t2.a,t2.b,t3.a,t3.b,t4.a,t4.b
FROM t1, t3, t4
RIGHT JOIN
t2
ON t3.a=1 AND t2.b=t4.b
WHERE t1.a <= 2;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t3	ALL	NULL	NULL	NULL	NULL	2	
1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	3	Using where
1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	3	
1	SIMPLE	t4	ALL	NULL	NULL	NULL	NULL	2	
Warnings:
Note	1003	select `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b`,`test`.`t2`.`a` AS `a`,`test`.`t2`.`b` AS `b`,`test`.`t3`.`a` AS `a`,`test`.`t3`.`b` AS `b`,`test`.`t4`.`a` AS `a`,`test`.`t4`.`b` AS `b` from `test`.`t1` join `test`.`t3` join `test`.`t2` left join `test`.`t4` on(((`test`.`t4`.`b` = `test`.`t2`.`b`) and (`test`.`t3`.`a` = 1))) where (`test`.`t1`.`a` <= 2)
CREATE INDEX idx_b ON t2(b);
EXPLAIN EXTENDED
SELECT t2.a,t2.b,t3.a,t3.b,t4.a,t4.b
FROM t3,t4 
LEFT JOIN              
(t1,t2)
ON t3.a=1 AND t3.b=t2.b AND t2.b=t4.b;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t3	ALL	NULL	NULL	NULL	NULL	2	
1	SIMPLE	t4	ALL	NULL	NULL	NULL	NULL	2	
1	SIMPLE	t2	ref	idx_b	idx_b	5	test.t3.b	2	
1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	3	
Warnings:
Note	1003	select `test`.`t2`.`a` AS `a`,`test`.`t2`.`b` AS `b`,`test`.`t3`.`a` AS `a`,`test`.`t3`.`b` AS `b`,`test`.`t4`.`a` AS `a`,`test`.`t4`.`b` AS `b` from `test`.`t3` join `test`.`t4` left join (`test`.`t1` join `test`.`t2`) on(((`test`.`t3`.`a` = 1) and (`test`.`t3`.`b` = `test`.`t2`.`b`) and (`test`.`t2`.`b` = `test`.`t4`.`b`))) where 1
SELECT t2.a,t2.b,t3.a,t3.b,t4.a,t4.b
FROM t3,t4 
LEFT JOIN              
(t1,t2)
ON t3.a=1 AND t3.b=t2.b AND t2.b=t4.b;
a	b	a	b	a	b
4	2	1	2	3	2
4	2	1	2	3	2
4	2	1	2	3	2
NULL	NULL	2	2	3	2
4	2	1	2	4	2
4	2	1	2	4	2
4	2	1	2	4	2
NULL	NULL	2	2	4	2
EXPLAIN EXTENDED
SELECT t0.a,t0.b,t1.a,t1.b,t2.a,t2.b,t3.a,t3.b,t4.a,t4.b,
t5.a,t5.b,t6.a,t6.b,t7.a,t7.b,t8.a,t8.b,t9.a,t9.b
FROM t0,t1
LEFT JOIN                
( 
t2
LEFT JOIN              
(t3, t4)
ON t3.a=1 AND t2.b=t4.b,
t5 
LEFT JOIN 
( 
t6,
t7 
LEFT JOIN 
t8
ON t7.b=t8.b AND t6.b < 10
)
ON t6.b >= 2 AND t5.b=t7.b 
)
ON (t3.b=2 OR t3.c IS NULL) AND (t6.b=2 OR t6.c IS NULL) AND
(t1.b=t5.b OR t3.c IS NULL OR t6.c IS NULL or t8.c IS NULL) AND
(t1.a != 2),
t9
WHERE t0.a=1 AND
t0.b=t1.b AND          
(t2.a >= 4 OR t2.c IS NULL) AND
(t3.a < 5 OR t3.c IS NULL) AND
(t3.b=t4.b OR t3.c IS NULL OR t4.c IS NULL) AND
(t5.a >=2 OR t5.c IS NULL) AND
(t6.a >=4 OR t6.c IS NULL) AND
(t7.a <= 2 OR t7.c IS NULL) AND
(t8.a < 1 OR t8.c IS NULL) AND
(t8.b=t9.b OR t8.c IS NULL) AND
(t9.a=1);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t0	ALL	NULL	NULL	NULL	NULL	3	Using where
1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	3	Using where
1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	3	Using where
1	SIMPLE	t3	ALL	NULL	NULL	NULL	NULL	2	Using where
1	SIMPLE	t4	ALL	NULL	NULL	NULL	NULL	2	Using where
1	SIMPLE	t5	ALL	NULL	NULL	NULL	NULL	3	Using where
1	SIMPLE	t7	ALL	NULL	NULL	NULL	NULL	2	Using where
1	SIMPLE	t6	ALL	NULL	NULL	NULL	NULL	3	Using where
1	SIMPLE	t8	ALL	NULL	NULL	NULL	NULL	2	Using where
1	SIMPLE	t9	ALL	NULL	NULL	NULL	NULL	3	Using where
Warnings:
Note	1003	select `test`.`t0`.`a` AS `a`,`test`.`t0`.`b` AS `b`,`test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b`,`test`.`t2`.`a` AS `a`,`test`.`t2`.`b` AS `b`,`test`.`t3`.`a` AS `a`,`test`.`t3`.`b` AS `b`,`test`.`t4`.`a` AS `a`,`test`.`t4`.`b` AS `b`,`test`.`t5`.`a` AS `a`,`test`.`t5`.`b` AS `b`,`test`.`t6`.`a` AS `a`,`test`.`t6`.`b` AS `b`,`test`.`t7`.`a` AS `a`,`test`.`t7`.`b` AS `b`,`test`.`t8`.`a` AS `a`,`test`.`t8`.`b` AS `b`,`test`.`t9`.`a` AS `a`,`test`.`t9`.`b` AS `b` from `test`.`t0` join `test`.`t1` left join (`test`.`t2` left join (`test`.`t3` join `test`.`t4`) on(((`test`.`t4`.`b` = `test`.`t2`.`b`) and (`test`.`t3`.`a` = 1))) join `test`.`t5` left join (`test`.`t6` join `test`.`t7` left join `test`.`t8` on(((`test`.`t8`.`b` = `test`.`t5`.`b`) and (`test`.`t6`.`b` < 10)))) on(((`test`.`t7`.`b` = `test`.`t5`.`b`) and (`test`.`t6`.`b` >= 2)))) on((((`test`.`t3`.`b` = 2) or isnull(`test`.`t3`.`c`)) and ((`test`.`t6`.`b` = 2) or isnull(`test`.`t6`.`c`)) and ((`test`.`t5`.`b` = `test`.`t0`.`b`) or isnull(`test`.`t3`.`c`) or isnull(`test`.`t6`.`c`) or isnull(`test`.`t8`.`c`)) and (`test`.`t1`.`a` <> 2))) join `test`.`t9` where ((`test`.`t9`.`a` = 1) and (`test`.`t1`.`b` = `test`.`t0`.`b`) and (`test`.`t0`.`a` = 1) and ((`test`.`t2`.`a` >= 4) or isnull(`test`.`t2`.`c`)) and ((`test`.`t3`.`a` < 5) or isnull(`test`.`t3`.`c`)) and ((`test`.`t4`.`b` = `test`.`t3`.`b`) or isnull(`test`.`t3`.`c`) or isnull(`test`.`t4`.`c`)) and ((`test`.`t5`.`a` >= 2) or isnull(`test`.`t5`.`c`)) and ((`test`.`t6`.`a` >= 4) or isnull(`test`.`t6`.`c`)) and ((`test`.`t7`.`a` <= 2) or isnull(`test`.`t7`.`c`)) and ((`test`.`t8`.`a` < 1) or isnull(`test`.`t8`.`c`)) and ((`test`.`t9`.`b` = `test`.`t8`.`b`) or isnull(`test`.`t8`.`c`)))
CREATE INDEX idx_b ON t4(b);
CREATE INDEX idx_b ON t5(b);
EXPLAIN EXTENDED
SELECT t0.a,t0.b,t1.a,t1.b,t2.a,t2.b,t3.a,t3.b,t4.a,t4.b,
t5.a,t5.b,t6.a,t6.b,t7.a,t7.b,t8.a,t8.b,t9.a,t9.b
FROM t0,t1
LEFT JOIN                
( 
t2
LEFT JOIN              
(t3, t4)
ON t3.a=1 AND t2.b=t4.b,
t5 
LEFT JOIN 
( 
t6,
t7 
LEFT JOIN 
t8
ON t7.b=t8.b AND t6.b < 10
)
ON t6.b >= 2 AND t5.b=t7.b 
)
ON (t3.b=2 OR t3.c IS NULL) AND (t6.b=2 OR t6.c IS NULL) AND
(t1.b=t5.b OR t3.c IS NULL OR t6.c IS NULL or t8.c IS NULL) AND
(t1.a != 2),
t9
WHERE t0.a=1 AND
t0.b=t1.b AND          
(t2.a >= 4 OR t2.c IS NULL) AND
(t3.a < 5 OR t3.c IS NULL) AND
(t3.b=t4.b OR t3.c IS NULL OR t4.c IS NULL) AND
(t5.a >=2 OR t5.c IS NULL) AND
(t6.a >=4 OR t6.c IS NULL) AND
(t7.a <= 2 OR t7.c IS NULL) AND
(t8.a < 1 OR t8.c IS NULL) AND
(t8.b=t9.b OR t8.c IS NULL) AND
(t9.a=1);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t0	ALL	NULL	NULL	NULL	NULL	3	Using where
1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	3	Using where
1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	3	Using where
1	SIMPLE	t3	ALL	NULL	NULL	NULL	NULL	2	Using where
1	SIMPLE	t4	ref	idx_b	idx_b	5	test.t2.b	2	Using where
1	SIMPLE	t5	ALL	NULL	NULL	NULL	NULL	3	Using where
1	SIMPLE	t7	ALL	NULL	NULL	NULL	NULL	2	Using where
1	SIMPLE	t6	ALL	NULL	NULL	NULL	NULL	3	Using where
1	SIMPLE	t8	ALL	NULL	NULL	NULL	NULL	2	Using where
1	SIMPLE	t9	ALL	NULL	NULL	NULL	NULL	3	Using where
Warnings:
Note	1003	select `test`.`t0`.`a` AS `a`,`test`.`t0`.`b` AS `b`,`test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b`,`test`.`t2`.`a` AS `a`,`test`.`t2`.`b` AS `b`,`test`.`t3`.`a` AS `a`,`test`.`t3`.`b` AS `b`,`test`.`t4`.`a` AS `a`,`test`.`t4`.`b` AS `b`,`test`.`t5`.`a` AS `a`,`test`.`t5`.`b` AS `b`,`test`.`t6`.`a` AS `a`,`test`.`t6`.`b` AS `b`,`test`.`t7`.`a` AS `a`,`test`.`t7`.`b` AS `b`,`test`.`t8`.`a` AS `a`,`test`.`t8`.`b` AS `b`,`test`.`t9`.`a` AS `a`,`test`.`t9`.`b` AS `b` from `test`.`t0` join `test`.`t1` left join (`test`.`t2` left join (`test`.`t3` join `test`.`t4`) on(((`test`.`t4`.`b` = `test`.`t2`.`b`) and (`test`.`t3`.`a` = 1))) join `test`.`t5` left join (`test`.`t6` join `test`.`t7` left join `test`.`t8` on(((`test`.`t8`.`b` = `test`.`t5`.`b`) and (`test`.`t6`.`b` < 10)))) on(((`test`.`t7`.`b` = `test`.`t5`.`b`) and (`test`.`t6`.`b` >= 2)))) on((((`test`.`t3`.`b` = 2) or isnull(`test`.`t3`.`c`)) and ((`test`.`t6`.`b` = 2) or isnull(`test`.`t6`.`c`)) and ((`test`.`t5`.`b` = `test`.`t0`.`b`) or isnull(`test`.`t3`.`c`) or isnull(`test`.`t6`.`c`) or isnull(`test`.`t8`.`c`)) and (`test`.`t1`.`a` <> 2))) join `test`.`t9` where ((`test`.`t9`.`a` = 1) and (`test`.`t1`.`b` = `test`.`t0`.`b`) and (`test`.`t0`.`a` = 1) and ((`test`.`t2`.`a` >= 4) or isnull(`test`.`t2`.`c`)) and ((`test`.`t3`.`a` < 5) or isnull(`test`.`t3`.`c`)) and ((`test`.`t4`.`b` = `test`.`t3`.`b`) or isnull(`test`.`t3`.`c`) or isnull(`test`.`t4`.`c`)) and ((`test`.`t5`.`a` >= 2) or isnull(`test`.`t5`.`c`)) and ((`test`.`t6`.`a` >= 4) or isnull(`test`.`t6`.`c`)) and ((`test`.`t7`.`a` <= 2) or isnull(`test`.`t7`.`c`)) and ((`test`.`t8`.`a` < 1) or isnull(`test`.`t8`.`c`)) and ((`test`.`t9`.`b` = `test`.`t8`.`b`) or isnull(`test`.`t8`.`c`)))
CREATE INDEX idx_b ON t8(b);
EXPLAIN EXTENDED
SELECT t0.a,t0.b,t1.a,t1.b,t2.a,t2.b,t3.a,t3.b,t4.a,t4.b,
t5.a,t5.b,t6.a,t6.b,t7.a,t7.b,t8.a,t8.b,t9.a,t9.b
FROM t0,t1
LEFT JOIN                
( 
t2
LEFT JOIN              
(t3, t4)
ON t3.a=1 AND t2.b=t4.b,
t5 
LEFT JOIN 
( 
t6,
t7 
LEFT JOIN 
t8
ON t7.b=t8.b AND t6.b < 10
)
ON t6.b >= 2 AND t5.b=t7.b 
)
ON (t3.b=2 OR t3.c IS NULL) AND (t6.b=2 OR t6.c IS NULL) AND
(t1.b=t5.b OR t3.c IS NULL OR t6.c IS NULL or t8.c IS NULL) AND
(t1.a != 2),
t9
WHERE t0.a=1 AND
t0.b=t1.b AND          
(t2.a >= 4 OR t2.c IS NULL) AND
(t3.a < 5 OR t3.c IS NULL) AND
(t3.b=t4.b OR t3.c IS NULL OR t4.c IS NULL) AND
(t5.a >=2 OR t5.c IS NULL) AND
(t6.a >=4 OR t6.c IS NULL) AND
(t7.a <= 2 OR t7.c IS NULL) AND
(t8.a < 1 OR t8.c IS NULL) AND
(t8.b=t9.b OR t8.c IS NULL) AND
(t9.a=1);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t0	ALL	NULL	NULL	NULL	NULL	3	Using where
1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	3	Using where
1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	3	Using where
1	SIMPLE	t3	ALL	NULL	NULL	NULL	NULL	2	Using where
1	SIMPLE	t4	ref	idx_b	idx_b	5	test.t2.b	2	Using where
1	SIMPLE	t5	ALL	NULL	NULL	NULL	NULL	3	Using where
1	SIMPLE	t7	ALL	NULL	NULL	NULL	NULL	2	Using where
1	SIMPLE	t6	ALL	NULL	NULL	NULL	NULL	3	Using where
1	SIMPLE	t8	ref	idx_b	idx_b	5	test.t5.b	2	Using where
1	SIMPLE	t9	ALL	NULL	NULL	NULL	NULL	3	Using where
Warnings:
Note	1003	select `test`.`t0`.`a` AS `a`,`test`.`t0`.`b` AS `b`,`test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b`,`test`.`t2`.`a` AS `a`,`test`.`t2`.`b` AS `b`,`test`.`t3`.`a` AS `a`,`test`.`t3`.`b` AS `b`,`test`.`t4`.`a` AS `a`,`test`.`t4`.`b` AS `b`,`test`.`t5`.`a` AS `a`,`test`.`t5`.`b` AS `b`,`test`.`t6`.`a` AS `a`,`test`.`t6`.`b` AS `b`,`test`.`t7`.`a` AS `a`,`test`.`t7`.`b` AS `b`,`test`.`t8`.`a` AS `a`,`test`.`t8`.`b` AS `b`,`test`.`t9`.`a` AS `a`,`test`.`t9`.`b` AS `b` from `test`.`t0` join `test`.`t1` left join (`test`.`t2` left join (`test`.`t3` join `test`.`t4`) on(((`test`.`t4`.`b` = `test`.`t2`.`b`) and (`test`.`t3`.`a` = 1))) join `test`.`t5` left join (`test`.`t6` join `test`.`t7` left join `test`.`t8` on(((`test`.`t8`.`b` = `test`.`t5`.`b`) and (`test`.`t6`.`b` < 10)))) on(((`test`.`t7`.`b` = `test`.`t5`.`b`) and (`test`.`t6`.`b` >= 2)))) on((((`test`.`t3`.`b` = 2) or isnull(`test`.`t3`.`c`)) and ((`test`.`t6`.`b` = 2) or isnull(`test`.`t6`.`c`)) and ((`test`.`t5`.`b` = `test`.`t0`.`b`) or isnull(`test`.`t3`.`c`) or isnull(`test`.`t6`.`c`) or isnull(`test`.`t8`.`c`)) and (`test`.`t1`.`a` <> 2))) join `test`.`t9` where ((`test`.`t9`.`a` = 1) and (`test`.`t1`.`b` = `test`.`t0`.`b`) and (`test`.`t0`.`a` = 1) and ((`test`.`t2`.`a` >= 4) or isnull(`test`.`t2`.`c`)) and ((`test`.`t3`.`a` < 5) or isnull(`test`.`t3`.`c`)) and ((`test`.`t4`.`b` = `test`.`t3`.`b`) or isnull(`test`.`t3`.`c`) or isnull(`test`.`t4`.`c`)) and ((`test`.`t5`.`a` >= 2) or isnull(`test`.`t5`.`c`)) and ((`test`.`t6`.`a` >= 4) or isnull(`test`.`t6`.`c`)) and ((`test`.`t7`.`a` <= 2) or isnull(`test`.`t7`.`c`)) and ((`test`.`t8`.`a` < 1) or isnull(`test`.`t8`.`c`)) and ((`test`.`t9`.`b` = `test`.`t8`.`b`) or isnull(`test`.`t8`.`c`)))
CREATE INDEX idx_b ON t1(b);
CREATE INDEX idx_a ON t0(a);
EXPLAIN EXTENDED
SELECT t0.a,t0.b,t1.a,t1.b,t2.a,t2.b,t3.a,t3.b,t4.a,t4.b,
t5.a,t5.b,t6.a,t6.b,t7.a,t7.b,t8.a,t8.b,t9.a,t9.b
FROM t0,t1
LEFT JOIN                
( 
t2
LEFT JOIN              
(t3, t4)
ON t3.a=1 AND t2.b=t4.b,
t5 
LEFT JOIN 
( 
t6,
t7 
LEFT JOIN 
t8
ON t7.b=t8.b AND t6.b < 10
)
ON t6.b >= 2 AND t5.b=t7.b 
)
ON (t3.b=2 OR t3.c IS NULL) AND (t6.b=2 OR t6.c IS NULL) AND
(t1.b=t5.b OR t3.c IS NULL OR t6.c IS NULL or t8.c IS NULL) AND
(t1.a != 2),
t9
WHERE t0.a=1 AND
t0.b=t1.b AND          
(t2.a >= 4 OR t2.c IS NULL) AND
(t3.a < 5 OR t3.c IS NULL) AND
(t3.b=t4.b OR t3.c IS NULL OR t4.c IS NULL) AND
(t5.a >=2 OR t5.c IS NULL) AND
(t6.a >=4 OR t6.c IS NULL) AND
(t7.a <= 2 OR t7.c IS NULL) AND
(t8.a < 1 OR t8.c IS NULL) AND
(t8.b=t9.b OR t8.c IS NULL) AND
(t9.a=1);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t0	ref	idx_a	idx_a	5	const	1	Using where
1	SIMPLE	t1	ref	idx_b	idx_b	5	test.t0.b	2	Using where
1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	3	Using where
1	SIMPLE	t3	ALL	NULL	NULL	NULL	NULL	2	Using where
1	SIMPLE	t4	ref	idx_b	idx_b	5	test.t2.b	2	Using where
1	SIMPLE	t5	ALL	NULL	NULL	NULL	NULL	3	Using where
1	SIMPLE	t7	ALL	NULL	NULL	NULL	NULL	2	Using where
1	SIMPLE	t6	ALL	NULL	NULL	NULL	NULL	3	Using where
1	SIMPLE	t8	ref	idx_b	idx_b	5	test.t5.b	2	Using where
1	SIMPLE	t9	ALL	NULL	NULL	NULL	NULL	3	Using where
Warnings:
Note	1003	select `test`.`t0`.`a` AS `a`,`test`.`t0`.`b` AS `b`,`test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b`,`test`.`t2`.`a` AS `a`,`test`.`t2`.`b` AS `b`,`test`.`t3`.`a` AS `a`,`test`.`t3`.`b` AS `b`,`test`.`t4`.`a` AS `a`,`test`.`t4`.`b` AS `b`,`test`.`t5`.`a` AS `a`,`test`.`t5`.`b` AS `b`,`test`.`t6`.`a` AS `a`,`test`.`t6`.`b` AS `b`,`test`.`t7`.`a` AS `a`,`test`.`t7`.`b` AS `b`,`test`.`t8`.`a` AS `a`,`test`.`t8`.`b` AS `b`,`test`.`t9`.`a` AS `a`,`test`.`t9`.`b` AS `b` from `test`.`t0` join `test`.`t1` left join (`test`.`t2` left join (`test`.`t3` join `test`.`t4`) on(((`test`.`t4`.`b` = `test`.`t2`.`b`) and (`test`.`t3`.`a` = 1))) join `test`.`t5` left join (`test`.`t6` join `test`.`t7` left join `test`.`t8` on(((`test`.`t8`.`b` = `test`.`t5`.`b`) and (`test`.`t6`.`b` < 10)))) on(((`test`.`t7`.`b` = `test`.`t5`.`b`) and (`test`.`t6`.`b` >= 2)))) on((((`test`.`t3`.`b` = 2) or isnull(`test`.`t3`.`c`)) and ((`test`.`t6`.`b` = 2) or isnull(`test`.`t6`.`c`)) and ((`test`.`t5`.`b` = `test`.`t0`.`b`) or isnull(`test`.`t3`.`c`) or isnull(`test`.`t6`.`c`) or isnull(`test`.`t8`.`c`)) and (`test`.`t1`.`a` <> 2))) join `test`.`t9` where ((`test`.`t9`.`a` = 1) and (`test`.`t1`.`b` = `test`.`t0`.`b`) and (`test`.`t0`.`a` = 1) and ((`test`.`t2`.`a` >= 4) or isnull(`test`.`t2`.`c`)) and ((`test`.`t3`.`a` < 5) or isnull(`test`.`t3`.`c`)) and ((`test`.`t4`.`b` = `test`.`t3`.`b`) or isnull(`test`.`t3`.`c`) or isnull(`test`.`t4`.`c`)) and ((`test`.`t5`.`a` >= 2) or isnull(`test`.`t5`.`c`)) and ((`test`.`t6`.`a` >= 4) or isnull(`test`.`t6`.`c`)) and ((`test`.`t7`.`a` <= 2) or isnull(`test`.`t7`.`c`)) and ((`test`.`t8`.`a` < 1) or isnull(`test`.`t8`.`c`)) and ((`test`.`t9`.`b` = `test`.`t8`.`b`) or isnull(`test`.`t8`.`c`)))
SELECT t0.a,t0.b,t1.a,t1.b,t2.a,t2.b,t3.a,t3.b,t4.a,t4.b,
t5.a,t5.b,t6.a,t6.b,t7.a,t7.b,t8.a,t8.b,t9.a,t9.b
FROM t0,t1
LEFT JOIN                
( 
t2
LEFT JOIN              
(t3, t4)
ON t3.a=1 AND t2.b=t4.b,
t5 
LEFT JOIN 
( 
t6,
t7 
LEFT JOIN 
t8
ON t7.b=t8.b AND t6.b < 10
)
ON t6.b >= 2 AND t5.b=t7.b 
)
ON (t3.b=2 OR t3.c IS NULL) AND (t6.b=2 OR t6.c IS NULL) AND
(t1.b=t5.b OR t3.c IS NULL OR t6.c IS NULL or t8.c IS NULL) AND
(t1.a != 2),
t9
WHERE t0.a=1 AND
t0.b=t1.b AND          
(t2.a >= 4 OR t2.c IS NULL) AND
(t3.a < 5 OR t3.c IS NULL) AND
(t3.b=t4.b OR t3.c IS NULL OR t4.c IS NULL) AND
(t5.a >=2 OR t5.c IS NULL) AND
(t6.a >=4 OR t6.c IS NULL) AND
(t7.a <= 2 OR t7.c IS NULL) AND
(t8.a < 1 OR t8.c IS NULL) AND
(t8.b=t9.b OR t8.c IS NULL) AND
(t9.a=1);
a	b	a	b	a	b	a	b	a	b	a	b	a	b	a	b	a	b	a	b
1	2	2	2	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	1	1
1	2	3	2	4	2	1	2	3	2	3	1	6	2	1	1	NULL	NULL	1	1
1	2	3	2	4	2	1	2	3	2	3	3	NULL	NULL	NULL	NULL	NULL	NULL	1	1
1	2	3	2	4	2	1	2	4	2	3	1	6	2	1	1	NULL	NULL	1	1
1	2	3	2	4	2	1	2	4	2	3	3	NULL	NULL	NULL	NULL	NULL	NULL	1	1
1	2	3	2	5	3	NULL	NULL	NULL	NULL	3	1	6	2	1	1	NULL	NULL	1	1
1	2	3	2	5	3	NULL	NULL	NULL	NULL	3	3	NULL	NULL	NULL	NULL	NULL	NULL	1	1
1	2	2	2	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	1	2
1	2	3	2	4	2	1	2	3	2	3	1	6	2	1	1	NULL	NULL	1	2
1	2	3	2	4	2	1	2	3	2	2	2	6	2	2	2	0	2	1	2
1	2	3	2	4	2	1	2	3	2	3	3	NULL	NULL	NULL	NULL	NULL	NULL	1	2
1	2	3	2	4	2	1	2	4	2	3	1	6	2	1	1	NULL	NULL	1	2
1	2	3	2	4	2	1	2	4	2	2	2	6	2	2	2	0	2	1	2
1	2	3	2	4	2	1	2	4	2	3	3	NULL	NULL	NULL	NULL	NULL	NULL	1	2
1	2	3	2	5	3	NULL	NULL	NULL	NULL	3	1	6	2	1	1	NULL	NULL	1	2
1	2	3	2	5	3	NULL	NULL	NULL	NULL	2	2	6	2	2	2	0	2	1	2
1	2	3	2	5	3	NULL	NULL	NULL	NULL	3	3	NULL	NULL	NULL	NULL	NULL	NULL	1	2
SELECT t2.a,t2.b
FROM t2;
a	b
3	3
4	2
5	3
SELECT t3.a,t3.b
FROM t3;
a	b
1	2
2	2
SELECT t2.a,t2.b,t3.a,t3.b
FROM t2 LEFT JOIN t3 ON t2.b=t3.b
WHERE t2.a = 4 OR (t2.a > 4 AND t3.a IS NULL);
a	b	a	b
4	2	1	2
4	2	2	2
5	3	NULL	NULL
SELECT t2.a,t2.b,t3.a,t3.b
FROM t2 LEFT JOIN (t3) ON t2.b=t3.b
WHERE t2.a = 4 OR (t2.a > 4 AND t3.a IS NULL);
a	b	a	b
4	2	1	2
4	2	2	2
5	3	NULL	NULL
ALTER TABLE t3
CHANGE COLUMN a a1 int,
CHANGE COLUMN c c1 int;
SELECT t2.a,t2.b,t3.a1,t3.b
FROM t2 LEFT JOIN t3 ON t2.b=t3.b
WHERE t2.a = 4 OR (t2.a > 4 AND t3.a1 IS NULL);
a	b	a1	b
4	2	1	2
4	2	2	2
5	3	NULL	NULL
SELECT t2.a,t2.b,t3.a1,t3.b
FROM t2 NATURAL LEFT JOIN t3
WHERE t2.a = 4 OR (t2.a > 4 AND t3.a1 IS NULL);
a	b	a1	b
4	2	1	2
4	2	2	2
5	3	NULL	NULL
DROP TABLE t0,t1,t2,t3,t4,t5,t6,t7,t8,t9;
CREATE TABLE t1 (a int);
CREATE TABLE t2 (a int);
CREATE TABLE t3 (a int);
INSERT INTO t1 VALUES (1);
INSERT INTO t2 VALUES (2);
INSERT INTO t3 VALUES (2);
INSERT INTO t1 VALUES (2);
SELECT * FROM t1 LEFT JOIN (t2 LEFT JOIN t3 ON t2.a=t3.a) ON t1.a=t3.a;
a	a	a
1	NULL	NULL
2	2	2
SELECT * FROM t1 LEFT JOIN t2 LEFT JOIN t3 ON t2.a=t3.a ON t1.a=t3.a;
a	a	a
1	NULL	NULL
2	2	2
DELETE FROM t1 WHERE a=2;
SELECT * FROM t1 LEFT JOIN t2 LEFT JOIN t3 ON t2.a=t3.a ON t1.a=t3.a;
a	a	a
1	NULL	NULL
DELETE FROM t2;
SELECT * FROM t1 LEFT JOIN t2 LEFT JOIN t3 ON t2.a=t3.a ON t1.a=t3.a;
a	a	a
1	NULL	NULL
DROP TABLE t1,t2,t3;
CREATE TABLE t1(a int, key (a));
CREATE TABLE t2(b int, key (b));
CREATE TABLE t3(c int, key (c));
INSERT INTO t1 VALUES (NULL), (0), (1), (2), (3), (4), (5), (6), (7), (8), (9),
(10), (11), (12), (13), (14), (15), (16), (17), (18), (19);
INSERT INTO t2 VALUES (NULL), (0), (1), (2), (3), (4), (5), (6), (7), (8), (9),
(10), (11), (12), (13), (14), (15), (16), (17), (18), (19);
INSERT INTO t3 VALUES (0), (1), (2), (3), (4), (5);
EXPLAIN SELECT a, b, c FROM t1 LEFT JOIN (t2, t3) ON c < 3 and b = c;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t1	index	NULL	a	5	NULL	21	Using index
1	SIMPLE	t3	index	c	c	5	NULL	6	Using index
1	SIMPLE	t2	ref	b	b	5	test.t3.c	2	Using index
EXPLAIN SELECT a, b, c FROM t1 LEFT JOIN (t2, t3) ON b < 3 and b = c;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t1	index	NULL	a	5	NULL	21	Using index
1	SIMPLE	t3	index	c	c	5	NULL	6	Using index
1	SIMPLE	t2	ref	b	b	5	test.t3.c	2	Using index
SELECT a, b, c FROM t1 LEFT JOIN (t2, t3) ON b < 3 and b = c;
a	b	c
NULL	0	0
NULL	1	1
NULL	2	2
0	0	0
0	1	1
0	2	2
1	0	0
1	1	1
1	2	2
2	0	0
2	1	1
2	2	2
3	0	0
3	1	1
3	2	2
4	0	0
4	1	1
4	2	2
5	0	0
5	1	1
5	2	2
6	0	0
6	1	1
6	2	2
7	0	0
7	1	1
7	2	2
8	0	0
8	1	1
8	2	2
9	0	0
9	1	1
9	2	2
10	0	0
10	1	1
10	2	2
11	0	0
11	1	1
11	2	2
12	0	0
12	1	1
12	2	2
13	0	0
13	1	1
13	2	2
14	0	0
14	1	1
14	2	2
15	0	0
15	1	1
15	2	2
16	0	0
16	1	1
16	2	2
17	0	0
17	1	1
17	2	2
18	0	0
18	1	1
18	2	2
19	0	0
19	1	1
19	2	2
DELETE FROM t3;
EXPLAIN SELECT a, b, c FROM t1 LEFT JOIN (t2, t3) ON b < 3 and b = c;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t1	index	NULL	a	5	NULL	21	Using index
1	SIMPLE	t3	index	c	c	5	NULL	0	Using index
1	SIMPLE	t2	ref	b	b	5	test.t3.c	2	Using index
SELECT a, b, c FROM t1 LEFT JOIN (t2, t3) ON b < 3 and b = c;
a	b	c
NULL	NULL	NULL
0	NULL	NULL
1	NULL	NULL
2	NULL	NULL
3	NULL	NULL
4	NULL	NULL
5	NULL	NULL
6	NULL	NULL
7	NULL	NULL
8	NULL	NULL
9	NULL	NULL
10	NULL	NULL
11	NULL	NULL
12	NULL	NULL
13	NULL	NULL
14	NULL	NULL
15	NULL	NULL
16	NULL	NULL
17	NULL	NULL
18	NULL	NULL
19	NULL	NULL
DROP TABLE t1,t2,t3;