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DROP TABLE IF EXISTS t1; 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; UPDATE t1 SET a=a+100; SELECT a,b FROM t1; a b 101 a 101 a 10100 foobar 10100 foobar 102 b 102 b 103 c 103 c 104 d 104 d 105 e 105 e UPDATE t1 SET a=a-100, b=DEFAULT WHERE a>100; SELECT a,b FROM t1; a b 1 NULL 1 NULL 10000 NULL 10000 NULL 2 NULL 2 NULL 3 NULL 3 NULL 4 NULL 4 NULL 5 NULL 5 NULL UPDATE t1 SET b = 'update' WHERE a <= 4 ORDER BY b DESC, a ASC LIMIT 1; SELECT a,b FROM t1; a b 1 NULL 1 update 10000 NULL 10000 NULL 2 NULL 2 NULL 3 NULL 3 NULL 4 NULL 4 NULL 5 NULL 5 NULL DROP TABLE t1;