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DROP TABLE IF EXISTS t1,t2;
CREATE TABLE t1 (a <INT_COLUMN>, b <CHAR_COLUMN>) ENGINE=<STORAGE_ENGINE> <CUSTOM_TABLE_OPTIONS>;
INSERT INTO t1 (a,b) VALUES (1,'a'),(2,'b'),(3,'c'),(4,'d'),(5,'e'),(10000,'foobar');
INSERT INTO t1 (a,b) SELECT a, b FROM t1;
CREATE TABLE t2 (c <CHAR_COLUMN>, d <INT_COLUMN>) ENGINE=<STORAGE_ENGINE> <CUSTOM_TABLE_OPTIONS>;
INSERT INTO t2 (c,d) SELECT b, a FROM t1;
UPDATE IGNORE t1 SET b = 'upd1' WHERE b IS NOT NULL ORDER BY a LIMIT 1;
SELECT a,b FROM t1;
a b
1 a
1 upd1
10000 foobar
10000 foobar
2 b
2 b
3 c
3 c
4 d
4 d
5 e
5 e
UPDATE IGNORE t1, t2 SET b = 'upd2a', c = 'upd2b'
WHERE c < b OR a != ( SELECT 1 UNION SELECT 2 );
Warnings:
Warning 1242 Subquery returns more than 1 row
SELECT a,b FROM t1;
a b
1 a
1 upd2a
10000 upd2a
10000 upd2a
2 upd2a
2 upd2a
3 upd2a
3 upd2a
4 upd2a
4 upd2a
5 upd2a
5 upd2a
SELECT c,d FROM t2;
c d
upd2b 1
upd2b 1
upd2b 10000
upd2b 10000
upd2b 2
upd2b 2
upd2b 3
upd2b 3
upd2b 4
upd2b 4
upd2b 5
upd2b 5
DROP TABLE t1, t2;
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