stop slave;
drop table if exists t1,t2,t3,t4,t5,t6,t7,t8,t9;
reset master;
reset slave;
drop table if exists t1,t2,t3,t4,t5,t6,t7,t8,t9;
start slave;
drop table if exists t1,t2;
CREATE TABLE t1 (
a int unsigned not null auto_increment primary key,
b int unsigned
) ENGINE=MyISAM;
CREATE TABLE t2 (
a int unsigned not null auto_increment primary key,
b int unsigned
) ENGINE=MyISAM;
INSERT INTO t1 VALUES (NULL, 0);
INSERT INTO t1 SELECT NULL, 0 FROM t1;
INSERT INTO t2 VALUES (NULL, 0), (NULL,1);
SELECT * FROM t1 ORDER BY a;
a	b
1	0
2	0
SELECT * FROM t2 ORDER BY a;
a	b
1	0
2	1
UPDATE t1, t2 SET t1.b = (t2.b+4) WHERE t1.a = t2.a;
SELECT * FROM t1 ORDER BY a;
a	b
1	4
2	5
SELECT * FROM t2 ORDER BY a;
a	b
1	0
2	1
SELECT * FROM t1 ORDER BY a;
a	b
1	4
2	5
SELECT * FROM t2 ORDER BY a;
a	b
1	0
2	1
drop table t1,t2;
reset master;
CREATE TABLE t1 ( a INT );
INSERT INTO t1 VALUES (0);
UPDATE t1, (SELECT 3 as b) AS x SET t1.a = x.b;
select * from t1;
a
3
select * from t1;
a
3
drop table t1;