1 CREATE TABLE t1 (a INT AUTO_INCREMENT PRIMARY KEY, b INT) ENGINE = InnoDB;
2 INSERT INTO t1 VALUES (1,1),(2,2),(3,3);
5 CREATE TEMPORARY TABLE t1_tmp ( b INT );
6 INSERT INTO t1_tmp (b) SELECT b FROM t1 WHERE a = 3;
7 INSERT INTO t1_tmp (b) SELECT b FROM t1 WHERE a = 2;
9 CREATE TEMPORARY TABLE t2_tmp ( a int, new_a int );
10 INSERT INTO t2_tmp VALUES (1,51),(2,52),(3,53);
11 UPDATE t1 SET a = (SELECT new_a FROM t2_tmp WHERE t2_tmp.a = t1.a) WHERE a = 1;
12 UPDATE t1 SET a = (SELECT new_a FROM t2_tmp WHERE t2_tmp.a = t1.a) WHERE a = 2;
13 INSERT INTO t1_tmp (b) SELECT b FROM t1 WHERE a = 1;
14 ERROR 40001: Deadlock found when trying to get lock; try restarting transaction
15 Reap the server message for connection user2 UPDATE t1 ...
16 UPDATE t1 SET a = (SELECT new_a FROM t2_tmp WHERE t2_tmp.a = t1.a) WHERE a = 3;