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drop table if exists t1; CREATE TABLE t1 SELECT _utf8'test' as c1, _utf8'ัะตัั' as c2; SHOW CREATE TABLE t1; Table Create Table t1 CREATE TABLE `t1` ( `c1` varchar(4) CHARACTER SET utf8 NOT NULL DEFAULT '', `c2` varchar(4) CHARACTER SET utf8 NOT NULL DEFAULT '' ) ENGINE=MyISAM DEFAULT CHARSET=latin1 DELETE FROM t1; ALTER TABLE t1 ADD c3 CHAR(4) CHARACTER SET utf8; SHOW CREATE TABLE t1; Table Create Table t1 CREATE TABLE `t1` ( `c1` varchar(4) CHARACTER SET utf8 NOT NULL DEFAULT '', `c2` varchar(4) CHARACTER SET utf8 NOT NULL DEFAULT '', `c3` char(4) CHARACTER SET utf8 DEFAULT NULL ) ENGINE=MyISAM DEFAULT CHARSET=latin1 INSERT INTO t1 VALUES ('aaaabbbbccccdddd','aaaabbbbccccdddd','aaaabbbbccccdddd'); Warnings: Warning 1265 Data truncated for column 'c1' at row 1 Warning 1265 Data truncated for column 'c2' at row 1 Warning 1265 Data truncated for column 'c3' at row 1 SELECT * FROM t1; c1 c2 c3 aaaa aaaa aaaa DROP TABLE t1; CREATE TABLE t1 (a CHAR(4) CHARACTER SET utf8, KEY key_a(a(3))); SHOW CREATE TABLE t1; Table Create Table t1 CREATE TABLE `t1` ( `a` char(4) CHARACTER SET utf8 DEFAULT NULL, KEY `key_a` (`a`(3)) ) ENGINE=MyISAM DEFAULT CHARSET=latin1 SHOW KEYS FROM t1; Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment Index_comment t1 1 key_a 1 a A NULL 3 NULL YES BTREE ALTER TABLE t1 CHANGE a a CHAR(4); SHOW CREATE TABLE t1; Table Create Table t1 CREATE TABLE `t1` ( `a` char(4) DEFAULT NULL, KEY `key_a` (`a`(3)) ) ENGINE=MyISAM DEFAULT CHARSET=latin1 SHOW KEYS FROM t1; Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment Index_comment t1 1 key_a 1 a A NULL 3 NULL YES BTREE ALTER TABLE t1 CHANGE a a CHAR(4) CHARACTER SET utf8; SHOW CREATE TABLE t1; Table Create Table t1 CREATE TABLE `t1` ( `a` char(4) CHARACTER SET utf8 DEFAULT NULL, KEY `key_a` (`a`(3)) ) ENGINE=MyISAM DEFAULT CHARSET=latin1 SHOW KEYS FROM t1; Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment Index_comment t1 1 key_a 1 a A NULL 3 NULL YES BTREE DROP TABLE t1;