psilo

hide_user31@phone>create table test ( foo tinyint default null );Query OK, 0 rows affected (0.01 sec)hide_user31@phone>insert into test values (1),(0),(1);Query OK, 3 rows affected (0.02 sec)Records: 3  Duplicates: 0  Warnings: 0hide_user31@phone>alter table test change column foo foo enum('zero','one');Query OK, 3 rows affected (0.00 sec)Records: 3  Duplicates: 0  Warnings: 0hide_user31@phone>select * from test;+------+| foo  |+------+| zero ||      || zero |+------+3 rows in set (0.00 sec)