create table users(
  id int,
  name varchar(64),
  sex bit(1),
  birthday date,
  Entry_date date,
  job varchar(32),
  salary float,
  resume text
);

alter table users add image blob;

alter table users modify sex char(2);

alter table users drop image;

rename table users to user;

alter table user character set gbk

alter table users change column sex sexy varchar(2);

mysql> describe users;
+------------+-------------+------+-----+---------+-------+
| Field   | Type    | Null | Key | Default | Extra |
+------------+-------------+------+-----+---------+-------+
| id     | int(11)   | YES |   | NULL  |    |
| name    | varchar(64) | YES |   | NULL  |    |
| sex    | bit(1)   | YES |   | NULL  |    |
| birthday  | date    | YES |   | NULL  |    |
| Entry_date | date    | YES |   | NULL  |    |
| job    | varchar(32) | YES |   | NULL  |    |
| salary   | float    | YES |   | NULL  |    |
| resume   | text    | YES |   | NULL  |    |

mysql> show create table users;

mysql> drop table test9;