mysql> desc TB_DOMAIN;
+-------------+-------------+------+-----+---------+----------------+
| Field       | Type        | Null | Key | Default | Extra          |
+-------------+-------------+------+-----+---------+----------------+
| no          | int(11)     |      | PRI | NULL    | auto_increment |
| ip          | varchar(32) |      |     |         |                |
| domain      | varchar(60) | YES  |     | NULL    |                |
| create_date | varchar(32) |      |     |         |                |
| update_date | varchar(32) |      |     |         |                |
| status      | varchar(10) | YES  |     | no      |                |
| reason      | varchar(60) | YES  |     | NULL    |                |
| memo        | varchar(60) |      |     |         |                |
+-------------+-------------+------+-----+---------+----------------+
8 rows in set (0.00 sec)


mysql> alter table TB_DOMAIN change column domain  domain varchar(80);
Query OK, 2495 rows affected (0.02 sec)
Records: 2495  Duplicates: 0  Warnings: 0

mysql> desc TB_DOMAIN;
+-------------+-------------+------+-----+---------+----------------+
| Field       | Type        | Null | Key | Default | Extra          |
+-------------+-------------+------+-----+---------+----------------+
| no          | int(11)     |      | PRI | NULL    | auto_increment |
| ip          | varchar(32) |      |     |         |                |
| domain      | varchar(80) | YES  |     | NULL    |                |
| create_date | varchar(32) |      |     |         |                |
| update_date | varchar(32) |      |     |         |                |
| status      | varchar(10) | YES  |     | no      |                |
| reason      | varchar(60) | YES  |     | NULL    |                |
| memo        | varchar(60) |      |     |         |                |
+-------------+-------------+------+-----+---------+----------------+
8 rows in set (0.00 sec)