~drizzle-trunk/drizzle/development

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	filtered	Extra
1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	3	100.00	
1	SIMPLE	t3	ALL	NULL	NULL	NULL	NULL	2	100.00	Using where
1	SIMPLE	t4	ALL	NULL	NULL	NULL	NULL	2	100.00	
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	filtered	Extra
1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	3	100.00	
1	SIMPLE	t3	ALL	NULL	NULL	NULL	NULL	2	100.00	Using where
1	SIMPLE	t4	ALL	NULL	NULL	NULL	NULL	2	100.00	
1	SIMPLE	t5	ALL	NULL	NULL	NULL	NULL	3	100.00	
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	filtered	Extra
1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	3	100.00	
1	SIMPLE	t3	ALL	NULL	NULL	NULL	NULL	2	100.00	Using where
1	SIMPLE	t4	ALL	NULL	NULL	NULL	NULL	2	100.00	
1	SIMPLE	t5	ALL	NULL	NULL	NULL	NULL	3	100.00	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	filtered	Extra
1	SIMPLE	t7	ALL	NULL	NULL	NULL	NULL	2	100.00	
1	SIMPLE	t6	ALL	NULL	NULL	NULL	NULL	3	100.00	Using join buffer
1	SIMPLE	t8	ALL	NULL	NULL	NULL	NULL	2	100.00	
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	filtered	Extra
1	SIMPLE	t0	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where
1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where; Using join buffer
1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where
1	SIMPLE	t3	ALL	NULL	NULL	NULL	NULL	2	100.00	
1	SIMPLE	t4	ALL	NULL	NULL	NULL	NULL	2	100.00	
1	SIMPLE	t5	ALL	NULL	NULL	NULL	NULL	3	100.00	
1	SIMPLE	t7	ALL	NULL	NULL	NULL	NULL	2	100.00	
1	SIMPLE	t6	ALL	NULL	NULL	NULL	NULL	3	100.00	
1	SIMPLE	t8	ALL	NULL	NULL	NULL	NULL	2	100.00	
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	filtered	Extra
1	SIMPLE	t0	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where
1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where; Using join buffer
1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where
1	SIMPLE	t3	ALL	NULL	NULL	NULL	NULL	2	100.00	Using where
1	SIMPLE	t4	ALL	NULL	NULL	NULL	NULL	2	100.00	Using where
1	SIMPLE	t5	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where
1	SIMPLE	t7	ALL	NULL	NULL	NULL	NULL	2	100.00	Using where
1	SIMPLE	t6	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where
1	SIMPLE	t8	ALL	NULL	NULL	NULL	NULL	2	100.00	Using where
1	SIMPLE	t9	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where; Using join buffer
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	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
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	filtered	Extra
1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where
1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	3	100.00	Using join buffer
1	SIMPLE	t3	ALL	NULL	NULL	NULL	NULL	2	100.00	
1	SIMPLE	t4	ALL	NULL	NULL	NULL	NULL	2	100.00	
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`.`t2` left join (`test`.`t3` 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	filtered	Extra
1	SIMPLE	t3	ALL	NULL	NULL	NULL	NULL	2	100.00	
1	SIMPLE	t4	ALL	NULL	NULL	NULL	NULL	2	100.00	Using join buffer
1	SIMPLE	t2	ref	idx_b	idx_b	5	test.t3.b	1	100.00	
1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	3	100.00	
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	filtered	Extra
1	SIMPLE	t0	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where
1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where; Using join buffer
1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where
1	SIMPLE	t3	ALL	NULL	NULL	NULL	NULL	2	100.00	Using where
1	SIMPLE	t4	ALL	NULL	NULL	NULL	NULL	2	100.00	Using where
1	SIMPLE	t5	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where
1	SIMPLE	t7	ALL	NULL	NULL	NULL	NULL	2	100.00	Using where
1	SIMPLE	t6	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where
1	SIMPLE	t8	ALL	NULL	NULL	NULL	NULL	2	100.00	Using where
1	SIMPLE	t9	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where; Using join buffer
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	filtered	Extra
1	SIMPLE	t0	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where
1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where; Using join buffer
1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where
1	SIMPLE	t4	ref	idx_b	idx_b	5	test.t2.b	1	100.00	
1	SIMPLE	t3	ALL	NULL	NULL	NULL	NULL	2	100.00	Using where
1	SIMPLE	t5	ALL	idx_b	NULL	NULL	NULL	3	100.00	Using where
1	SIMPLE	t7	ALL	NULL	NULL	NULL	NULL	2	100.00	Using where
1	SIMPLE	t6	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where
1	SIMPLE	t8	ALL	NULL	NULL	NULL	NULL	2	100.00	Using where
1	SIMPLE	t9	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where; Using join buffer
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`.`t3`.`b` = `test`.`t4`.`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	filtered	Extra
1	SIMPLE	t0	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where
1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where; Using join buffer
1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where
1	SIMPLE	t4	ref	idx_b	idx_b	5	test.t2.b	1	100.00	
1	SIMPLE	t3	ALL	NULL	NULL	NULL	NULL	2	100.00	Using where
1	SIMPLE	t5	ALL	idx_b	NULL	NULL	NULL	3	100.00	Using where
1	SIMPLE	t7	ALL	NULL	NULL	NULL	NULL	2	100.00	Using where
1	SIMPLE	t6	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where
1	SIMPLE	t8	ref	idx_b	idx_b	5	test.t5.b	1	100.00	Using where
1	SIMPLE	t9	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where; Using join buffer
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`.`t3`.`b` = `test`.`t4`.`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	filtered	Extra
1	SIMPLE	t0	ref	idx_a	idx_a	5	const	1	100.00	
1	SIMPLE	t1	ref	idx_b	idx_b	5	test.t0.b	1	100.00	
1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where
1	SIMPLE	t4	ref	idx_b	idx_b	5	test.t2.b	1	100.00	
1	SIMPLE	t3	ALL	NULL	NULL	NULL	NULL	2	100.00	Using where
1	SIMPLE	t5	ALL	idx_b	NULL	NULL	NULL	3	100.00	Using where
1	SIMPLE	t7	ALL	NULL	NULL	NULL	NULL	2	100.00	Using where
1	SIMPLE	t6	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where
1	SIMPLE	t8	ref	idx_b	idx_b	5	test.t5.b	1	100.00	Using where
1	SIMPLE	t9	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where; Using join buffer
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`.`t3`.`b` = `test`.`t4`.`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	1	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	1	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	1	Using index
1	SIMPLE	t2	ref	b	b	5	test.t3.c	1	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;
CREATE TABLE t1 (c11 int);
CREATE TABLE t2 (c21 int);
CREATE TABLE t3 (c31 int);
INSERT INTO t1 VALUES (4), (5);
SELECT * FROM t1 LEFT JOIN t2 ON c11=c21;
c11	c21
4	NULL
5	NULL
EXPLAIN SELECT * FROM t1 LEFT JOIN t2 ON c11=c21;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	2	
1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	1	
SELECT * FROM t1 LEFT JOIN (t2 LEFT JOIN t3 ON c21=c31) ON c11=c21;
c11	c21	c31
4	NULL	NULL
5	NULL	NULL
EXPLAIN SELECT * FROM t1 LEFT JOIN (t2 LEFT JOIN t3 ON c21=c31) ON c11=c21;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	2	
1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	1	
1	SIMPLE	t3	ALL	NULL	NULL	NULL	NULL	1	
DROP TABLE t1,t2,t3;
create table t1 (a int);
insert into t1 values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9);
create table t2 (a int, filler char(100), key(a));
insert into t2 select A.a + 10*B.a, '' from t1 A, t1 B;
create table t3 like t2;
insert into t3 select * from t2;
explain select * from t1 left join 
(t2 left join t3 on (t2.a = t3.a)) 
on (t1.a = t2.a);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	10	
1	SIMPLE	t2	ref	a	a	5	test.t1.a	1	
1	SIMPLE	t3	ref	a	a	5	test.t2.a	1	
drop table t1, t2, t3;
CREATE TABLE t1 (
id int NOT NULL PRIMARY KEY,
ct int DEFAULT NULL,
pc int DEFAULT NULL,
INDEX idx_ct (ct),
INDEX idx_pc (pc)
);
INSERT INTO t1 VALUES  
(1,NULL,NULL),(2,NULL,NULL),(3,NULL,NULL),(4,NULL,NULL),(5,NULL,NULL);
CREATE TABLE t2 (
id int NOT NULL PRIMARY KEY,
sr int NOT NULL,
nm varchar(255) NOT NULL,
INDEX idx_sr (sr)
);
INSERT INTO t2 VALUES
(2441905,4308,'LesAbymes'),(2441906,4308,'Anse-Bertrand');
CREATE TABLE t3 (
id int NOT NULL PRIMARY KEY,
ct int NOT NULL,
ln int NOT NULL,
INDEX idx_ct (ct),
INDEX idx_ln (ln)
);
CREATE TABLE t4 (
id int NOT NULL PRIMARY KEY,
nm varchar(255) NOT NULL
);
INSERT INTO t4 VALUES (4308,'Guadeloupe'),(4309,'Martinique');
SELECT t1.*
FROM t1 LEFT JOIN
(t2 LEFT JOIN t3 ON t3.ct=t2.id AND t3.ln='5') ON t1.ct=t2.id
WHERE t1.id='5';
id	ct	pc
5	NULL	NULL
SELECT t1.*, t4.nm
FROM t1 LEFT JOIN
(t2 LEFT JOIN t3 ON t3.ct=t2.id AND t3.ln='5') ON t1.ct=t2.id
LEFT JOIN t4 ON t2.sr=t4.id
WHERE t1.id='5';
id	ct	pc	nm
5	NULL	NULL	NULL
DROP TABLE t1,t2,t3,t4;
CREATE TABLE t1 (a INT, b INT);
CREATE TABLE t2 (a INT);
CREATE TABLE t3 (a INT, c INT);
CREATE TABLE t4 (a INT, c INT);
CREATE TABLE t5 (a INT, c INT);
SELECT b FROM t1 JOIN (t2 LEFT JOIN t3 USING (a) LEFT JOIN t4 USING (a)
LEFT JOIN t5 USING (a)) USING (a);
b
SELECT c FROM t1 JOIN (t2 LEFT JOIN t3 USING (a) LEFT JOIN t4 USING (a)
LEFT JOIN t5 USING (a)) USING (a);
ERROR 23000: Column 'c' in field list is ambiguous
SELECT b FROM t1 JOIN (t2 JOIN t3 USING (a) JOIN t4 USING (a)
JOIN t5 USING (a)) USING (a);
b
SELECT c FROM t1 JOIN (t2 JOIN t3 USING (a) JOIN t4 USING (a)
JOIN t5 USING (a)) USING (a);
ERROR 23000: Column 'c' in field list is ambiguous
DROP TABLE t1,t2,t3,t4,t5;
CREATE TABLE t1 (a INT, b INT);
CREATE TABLE t2 (a INT, b INT);
CREATE TABLE t3 (a INT, b INT);
INSERT INTO t1 VALUES (1,1);
INSERT INTO t2 VALUES (1,1);
INSERT INTO t3 VALUES (1,1);
SELECT * FROM t1 JOIN (t2 JOIN t3 USING (b)) USING (a);
ERROR 23000: Column 'a' in from clause is ambiguous
DROP TABLE t1,t2,t3;
CREATE TABLE t1 (
carrier char(2) default NULL,
id int NOT NULL auto_increment PRIMARY KEY
);
INSERT INTO t1 VALUES
('CO',235371754),('CO',235376554),('CO',235376884),('CO',235377874),
('CO',231060394),('CO',231059224),('CO',231059314),('CO',231060484),
('CO',231060274),('CO',231060124),('CO',231060244),('CO',231058594),
('CO',231058924),('CO',231058504),('CO',231059344),('CO',231060424),
('CO',231059554),('CO',231060304),('CO',231059644),('CO',231059464),
('CO',231059764),('CO',231058294),('CO',231058624),('CO',231058864),
('CO',231059374),('CO',231059584),('CO',231059734),('CO',231059014),
('CO',231059854),('CO',231059494),('CO',231059794),('CO',231058534),
('CO',231058324),('CO',231058684),('CO',231059524),('CO',231059974);
CREATE TABLE t2 (
scan_date date default NULL,
package_id int default NULL,
INDEX scan_date(scan_date),
INDEX package_id(package_id)
);
INSERT INTO t2 VALUES
('2008-12-29',231062944),('2008-12-29',231065764),('2008-12-29',231066124),
('2008-12-29',231060094),('2008-12-29',231061054),('2008-12-29',231065644),
('2008-12-29',231064384),('2008-12-29',231064444),('2008-12-29',231073774),
('2008-12-29',231058594),('2008-12-29',231059374),('2008-12-29',231066004),
('2008-12-29',231068494),('2008-12-29',231070174),('2008-12-29',231071884),
('2008-12-29',231063274),('2008-12-29',231063754),('2008-12-29',231064144),
('2008-12-29',231069424),('2008-12-29',231073714),('2008-12-29',231058414),
('2008-12-29',231060994),('2008-12-29',231069154),('2008-12-29',231068614),
('2008-12-29',231071464),('2008-12-29',231074014),('2008-12-29',231059614),
('2008-12-29',231059074),('2008-12-29',231059464),('2008-12-29',231069094),
('2008-12-29',231067294),('2008-12-29',231070144),('2008-12-29',231073804),
('2008-12-29',231072634),('2008-12-29',231058294),('2008-12-29',231065344),
('2008-12-29',231066094),('2008-12-29',231069034),('2008-12-29',231058594),
('2008-12-29',231059854),('2008-12-29',231059884),('2008-12-29',231059914),
('2008-12-29',231063664),('2008-12-29',231063814),('2008-12-29',231063904);
CREATE TABLE t3 (
package_id int default NULL,
INDEX package_id(package_id)
);
INSERT INTO t3 VALUES
(231058294),(231058324),(231058354),(231058384),(231058414),(231058444),
(231058474),(231058504),(231058534),(231058564),(231058594),(231058624),
(231058684),(231058744),(231058804),(231058864),(231058924),(231058954),
(231059014),(231059074),(231059104),(231059134),(231059164),(231059194),
(231059224),(231059254),(231059284),(231059314),(231059344),(231059374),
(231059404),(231059434),(231059464),(231059494),(231059524),(231059554),
(231059584),(231059614),(231059644),(231059674),(231059704),(231059734),
(231059764),(231059794),(231059824),(231059854),(231059884),(231059914),
(231059944),(231059974),(231060004),(231060034),(231060064),(231060094),
(231060124),(231060154),(231060184),(231060214),(231060244),(231060274),
(231060304),(231060334),(231060364),(231060394),(231060424),(231060454),
(231060484),(231060514),(231060544),(231060574),(231060604),(231060634),
(231060664),(231060694),(231060724),(231060754),(231060784),(231060814),
(231060844),(231060874),(231060904),(231060934),(231060964),(231060994),
(231061024),(231061054),(231061084),(231061144),(231061174),(231061204),
(231061234),(231061294),(231061354),(231061384),(231061414),(231061474),
(231061564),(231061594),(231061624),(231061684),(231061714),(231061774),
(231061804),(231061894),(231061984),(231062074),(231062134),(231062224),
(231062254),(231062314),(231062374),(231062434),(231062494),(231062554),
(231062584),(231062614),(231062644),(231062704),(231062734),(231062794),
(231062854),(231062884),(231062944),(231063004),(231063034),(231063064),
(231063124),(231063154),(231063184),(231063214),(231063274),(231063334),
(231063394),(231063424),(231063454),(231063514),(231063574),(231063664);
CREATE TABLE t4 (
carrier char(2) NOT NULL default '' PRIMARY KEY,
id int default NULL,
INDEX id(id)
);
INSERT INTO t4 VALUES
('99',6),('SK',456),('UA',486),('AI',1081),('OS',1111),('VS',1510);
CREATE TABLE t5 (
carrier_id int default NULL,
INDEX carrier_id(carrier_id)
);
INSERT INTO t5 VALUES
(6),(6),(6),(6),(6),(6),(6),(6),(6),(6),(6),(6),(6),(6),(6),(6),(6),(6),(6),
(6),(6),(6),(6),(6),(6),(6),(6),(6),(6),(6),(6),(6),(6),(6),(6),(6),(6),(6),
(6),(6),(6),(6),(6),(6),(6),(6),(6),(6),(6),(6),(6),(6),(6),(6),(6),(6),(6),
(6),(6),(6),(6),(6),(6),(6),(6),(6),(6),(6),(6),(6),(6),(6),(6),(6),(6),(6),
(6),(6),(6),(6),(6),(6),(6),(6),(6),(6),(6),(6),(6),(6),(6),(6),(6),(6),(6),
(6),(6),(6),(6),(6),(6),(6),(6),(6),(6),(6),(6),(6),(6),(456),(456),(456),
(456),(456),(456),(456),(456),(456),(456),(456),(456),(456),(456),(456),
(456),(486),(1081),(1111),(1111),(1111),(1111),(1510);
SELECT COUNT(*) 
FROM((t2 JOIN t1 ON t2.package_id = t1.id) 
JOIN t3 ON t3.package_id = t1.id);
COUNT(*)
6
EXPLAIN
SELECT COUNT(*) 
FROM ((t2 JOIN t1 ON t2.package_id = t1.id) 
JOIN t3 ON t3.package_id = t1.id)
LEFT JOIN 
(t5 JOIN t4 ON t5.carrier_id = t4.id)
ON t4.carrier = t1.carrier;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t1	ALL	PRIMARY	NULL	NULL	NULL	36	
1	SIMPLE	t4	eq_ref	PRIMARY,id	PRIMARY	10	test.t1.carrier	1	
1	SIMPLE	t5	ref	carrier_id	carrier_id	5	test.t4.id	1	Using index
1	SIMPLE	t2	ref	package_id	package_id	5	test.t1.id	1	Using index
1	SIMPLE	t3	ref	package_id	package_id	5	test.t1.id	1	Using index
SELECT COUNT(*) 
FROM ((t2 JOIN t1 ON t2.package_id = t1.id) 
JOIN t3 ON t3.package_id = t1.id)
LEFT JOIN 
(t5 JOIN t4 ON t5.carrier_id = t4.id)
ON t4.carrier = t1.carrier;
COUNT(*)
6
DROP TABLE t1,t2,t3,t4,t5;
End of 5.0 tests