mysql> describe pet;
+-------+-------------+------+-----+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+-------+-------------+------+-----+---------+-------+
| name | varchar(20) | YES | | NULL | |
| owner | varchar(20) | YES | | NULL | |
| kind | varchar(20) | YES | | NULL | |
| sex | char(1) | YES | | NULL | |
| birth | date | YES | | NULL | |
| death | date | YES | | NULL | |
+-------+-------------+------+-----+---------+-------+
6 rows in set (0.00 sec)
mysql> alter table pet modify kind varchar(10); 把kind从20改为10
Query OK, 13 rows affected (0.07 sec)
Records: 13 Duplicates: 0 Warnings: 0
mysql> describe pet;
+-------+-------------+------+-----+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+-------+-------------+------+-----+---------+-------+
| name | varchar(20) | YES | | NULL | |
| owner | varchar(20) | YES | | NULL | |
| kind | varchar(10) | YES | | NULL | |
| sex | char(1) | YES | | NULL | |
| birth | date | YES | | NULL | |
| death | date | YES | | NULL | |
+-------+-------------+------+-----+---------+-------+
6 rows in set (0.00 sec)
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