drop table IF EXISTS t21126; CREATE TABLE t21126 ( a int(6) PRIMARY KEY, b varchar(20), c varchar(8), d varchar(8), e varchar(256), f varchar(8), g varchar(256), h char(1), i char(1), j text, k varchar(15), l datetime, m varchar(15), n datetime ) ENGINE = innodb, CHARACTER SET = 'eucjpms'; ALTER TABLE t21126 ADD UNIQUE (b); INSERT INTO t21126 (a, b) VALUES(1, 'あいうえお'); INSERT INTO t21126 (a, b) VALUES(2, 'あいうえおかきくけこ'); INSERT INTO t21126 (a, b) VALUES(3, 'あいうえおかきくけこさしすせそ'); INSERT INTO t21126 (a, b) VALUES(4, 'あいうえおかきくけこさしすせそたちつてと');