1CREATE TABLE t1 ( a INT, b CHAR(3) );
2INSERT INTO t1 VALUES ( 1, 'foo' );
3CREATE TABLE t2 ( c CHAR(3), d INT );
4INSERT INTO t2 VALUES ( 'foo', 1 );
5UPDATE IGNORE t1, t2 SET b = 'bar', c = 'bar'
6  WHERE a != ( SELECT 1 UNION SELECT 2 );
7Warnings:
8Warning	1242	Subquery returns more than 1 row
9DROP TABLE t1, t2;
10