1438
1438
INSERT INTO t1 VALUES (1), (2), (3);
1439
1439
CREATE TABLE t2 SELECT * FROM (SELECT NULL) a UNION SELECT a FROM t1;
1443
1443
CREATE TABLE t3 SELECT a FROM t1 UNION SELECT * FROM (SELECT NULL) a;
1447
1447
CREATE TABLE t4 SELECT NULL;
1451
1451
CREATE TABLE t5 SELECT NULL UNION SELECT NULL;
1456
1456
SELECT * FROM (SELECT * FROM (SELECT NULL)a) b UNION SELECT a FROM t1;
1460
1460
DROP TABLE t1, t2, t3, t4, t5, t6;