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drop table if exists t1, t2; CREATE TABLE t1 ( a int ); INSERT INTO t1 VALUES (1),(2),(1); CREATE TABLE t2 ( PRIMARY KEY (a) ) ENGINE=INNODB SELECT a FROM t1; ERROR 23000: Duplicate entry '1' for key 'PRIMARY' select * from t2; ERROR 42S02: Table 'test.t2' doesn't exist CREATE TEMPORARY TABLE t2 ( PRIMARY KEY (a) ) ENGINE=INNODB SELECT a FROM t1; ERROR 23000: Duplicate entry '1' for key 'PRIMARY' select * from t2; ERROR 42S02: Table 'test.t2' doesn't exist CREATE TABLE t2 ( PRIMARY KEY (a) ) ENGINE=MYISAM SELECT a FROM t1; ERROR 23000: Duplicate entry '1' for key 'PRIMARY' select * from t2; ERROR 42S02: Table 'test.t2' doesn't exist CREATE TEMPORARY TABLE t2 ( PRIMARY KEY (a) ) ENGINE=MYISAM SELECT a FROM t1; ERROR 23000: Duplicate entry '1' for key 'PRIMARY' select * from t2; ERROR 42S02: Table 'test.t2' doesn't exist drop table t1;