Mysql修改表字段类型

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Mysql修改表字段类型

• 查看表结构

mysql> desc orders ;
+-------------+-------------+------+-----+---------+-------+
| Field       | Type        | Null | Key | Default | Extra |
+-------------+-------------+------+-----+---------+-------+
| shipaddress | varchar(20) | YES  | MUL | NULL    |       |
| shipcity    | varchar(20) | YES  |     | NULL    |       |
+-------------+-------------+------+-----+---------+-------+
2 rows in set (0.13 sec)

• 修改表字段

mysql> alter table orders modify column shipaddress int(20) ;
Query OK, 0 rows affected (0.85 sec)
Records: 0  Duplicates: 0  Warnings: 0

• 查看修改后的类型

mysql> desc orders ;
+-------------+-------------+------+-----+---------+-------+
| Field       | Type        | Null | Key | Default | Extra |
+-------------+-------------+------+-----+---------+-------+
| shipaddress | int(20)     | YES  | MUL | NULL    |       |
| shipcity    | varchar(20) | YES  |     | NULL    |       |
+-------------+-------------+------+-----+---------+-------+
2 rows in set (0.00 sec)