WHERE id='a12' AND (LENGTH(code)=5 OR code < 'a00');
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ref code code 13 const 3 Using where; Using index
1 SIMPLE t2 ref PRIMARY PRIMARY 12 const 1 Using where; Using index
id select_type table type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 ref code code 13 const 3 100.00 Using where; Using index
1 SIMPLE t2 ref PRIMARY PRIMARY 12 const 1 100.00 Using where; Using index
Warnings:
Note 1003 select `test`.`t1`.`code` AS `code`,`test`.`t2`.`id` AS `id` from `test`.`t1` join `test`.`t2` where ((`test`.`t1`.`code` = _latin1'a12') and (`test`.`t2`.`id` = _latin1'a12') and (length(`test`.`t1`.`code`) = 5))
EXPLAIN SELECT * FROM t1,t2 WHERE t1.a=t2.a AND t1.b=2;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index PRIMARY PRIMARY 8 NULL 5 Using where; Using index
1 SIMPLE t1 index PRIMARY PRIMARY 8 NULL 6 Using where; Using index
1 SIMPLE t2 ref PRIMARY PRIMARY 4 test.t1.a 1 Using index
EXPLAIN SELECT * FROM t1,t2 WHERE (t1.a,t1.b)=(t2.a,2);
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index PRIMARY PRIMARY 8 NULL 5 Using where; Using index
1 SIMPLE t1 index PRIMARY PRIMARY 8 NULL 6 Using where; Using index
1 SIMPLE t2 ref PRIMARY PRIMARY 4 test.t1.a 1 Using index
SELECT * FROM t1,t2 WHERE t1.a=1 and t1.b=t2.b;
a b a b c
...
...
@@ -248,9 +248,9 @@ a b a b c
3 2 3 1 1
3 2 3 1 3
EXPLAIN EXTENDED SELECT * FROM t1,t2 WHERE (t1.a,t1.b)=(t2.a,t2.b+1);
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index PRIMARY PRIMARY 8 NULL 6 Using index
1 SIMPLE t2 ref PRIMARY PRIMARY 4 test.t1.a 1 Using where; Using index
id select_type table type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 index PRIMARY PRIMARY 8 NULL 6 100.00 Using index
1 SIMPLE t2 ref PRIMARY PRIMARY 4 test.t1.a 1 100.00 Using where; Using index
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`.`t2`.`c` AS `c` from `test`.`t1` join `test`.`t2` where ((`test`.`t2`.`a` = `test`.`t1`.`a`) and (`test`.`t1`.`b` = (`test`.`t2`.`b` + 1)))
SELECT * FROM t1,t2 WHERE (t1.a,t1.b)=(t2.a,t2.b+1);
...
...
@@ -260,9 +260,9 @@ a b a b c
3 2 3 1 1
3 2 3 1 3
EXPLAIN EXTENDED SELECT * FROM t1,t2 WHERE (t1.a-1,t1.b)=(t2.a-1,t2.b+1);
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index NULL PRIMARY 8 NULL 6 Using index
1 SIMPLE t2 index NULL PRIMARY 12 NULL 7 Using where; Using index
id select_type table type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 index NULL PRIMARY 8 NULL 6 100.00 Using index
1 SIMPLE t2 index NULL PRIMARY 12 NULL 7 100.00 Using where; Using index
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`.`t2`.`c` AS `c` from `test`.`t1` join `test`.`t2` where (((`test`.`t1`.`a` - 1) = (`test`.`t2`.`a` - 1)) and (`test`.`t1`.`b` = (`test`.`t2`.`b` + 1)))
SELECT * FROM t1,t2 WHERE (t1.a-1,t1.b)=(t2.a-1,t2.b+1);
...
...
@@ -286,9 +286,9 @@ id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index PRIMARY PRIMARY 8 NULL 6 Using index
1 SIMPLE t2 eq_ref PRIMARY PRIMARY 12 test.t1.a,const,const 1 Using index
EXPLAIN EXTENDED SELECT * FROM t1,t2 WHERE (t2.a,(t2.b,t2.c))=(t1.a,(2,1));
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index PRIMARY PRIMARY 8 NULL 6 Using index
1 SIMPLE t2 eq_ref PRIMARY PRIMARY 12 test.t1.a,const,const 1 Using index
id select_type table type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 index PRIMARY PRIMARY 8 NULL 6 100.00 Using index
1 SIMPLE t2 eq_ref PRIMARY PRIMARY 12 test.t1.a,const,const 1 100.00 Using index
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`.`t2`.`c` AS `c` from `test`.`t1` join `test`.`t2` where ((`test`.`t2`.`c` = 1) and (`test`.`t2`.`b` = 2) and (`test`.`t2`.`a` = `test`.`t1`.`a`))
SELECT * FROM t1,t2 WHERE (t2.a,(t2.b,t2.c))=(t1.a,(2,1));
...
...
@@ -296,9 +296,9 @@ a b a b c
1 1 1 2 1
1 2 1 2 1
EXPLAIN EXTENDED SELECT * FROM t1,t2 WHERE t2.a=t1.a AND (t2.b,t2.c)=(2,1);
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index PRIMARY PRIMARY 8 NULL 6 Using index
1 SIMPLE t2 eq_ref PRIMARY PRIMARY 12 test.t1.a,const,const 1 Using index
id select_type table type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 index PRIMARY PRIMARY 8 NULL 6 100.00 Using index
1 SIMPLE t2 eq_ref PRIMARY PRIMARY 12 test.t1.a,const,const 1 100.00 Using index
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`.`t2`.`c` AS `c` from `test`.`t1` join `test`.`t2` where ((`test`.`t2`.`c` = 1) and (`test`.`t2`.`b` = 2) and (`test`.`t2`.`a` = `test`.`t1`.`a`))
SELECT * FROM t1,t2 WHERE t2.a=t1.a AND (t2.b,t2.c)=(2,1);