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CREATE TABLE t1 (id SERIAL); SHOW CREATE TABLE t1; CREATE TABLE t2 (id INT SERIAL DEFAULT VALUE); SHOW CREATE TABLE t2; CREATE TABLE t3 (id INT UNSIGNED SERIAL DEFAULT VALUE); SHOW CREATE TABLE t3; -- CREATE TABLE t4 (id SERIAL, val INT); SHOW CREATE TABLE t4; ALTER TABLE t4 ADD INDEX (id, val), DROP INDEX id; SHOW CREATE TABLE t4; INSERT INTO t4 VALUES (DEFAULT, 11), (DEFAULT, 22), (1,33), (2,22), (DEFAULT, 11), (DEFAULT, 22); SELECT * FROM t4;

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