mysql 里面零填充和默认值属性：zerofill default 属性

mysql 里面零填充和默认值属性：zerofill default 属性

mysql> CREATE TABLE shop (

-> article INT(4) UNSIGNED ZEROFILL DEFAULT '0000' NOT NULL,

-> dealer CHAR(20) DEFAULT '' NOT NULL,

-> price DOUBLE(16,2) DEFAULT '0.00' NOT NULL,

-> PRIMARY KEY(article, dealer));

mysql> desc shop;

+---------+--------------------------+------+-----+---------+-------+

| Field | Type | Null | Key | Default | Extra |

+---------+--------------------------+------+-----+---------+-------+

| article | int(4) unsigned zerofill | NO | PRI | 0000 | |

| dealer | char(20) | NO | PRI | | |

| price | double(16,2) | NO | | 0.00 | |

+---------+--------------------------+------+-----+---------+-------+

mysql> select * from shop;

+---------+--------+-------+

| article | dealer | price |

+---------+--------+-------+

| 0001 | A | 3.45 |

| 0001 | B | 3.99 |

| 0002 | A | 10.99 |

| 0003 | B | 1.45 |

| 0003 | C | 1.69 |

| 0003 | D | 1.25 |

| 0004 | D | 19.95 |

+---------+--------+-------+

7 rows in set (0.00 sec)

mysql> insert into shop values('','','');

Query OK, 1 row affected, 2 warnings (0.01 sec)

mysql> select * from shop;

+---------+--------+-------+

| article | dealer | price |

+---------+--------+-------+

| 0001 | A | 3.45 |

| 0001 | B | 3.99 |

| 0002 | A | 10.99 |

| 0003 | B | 1.45 |

| 0003 | C | 1.69 |

| 0003 | D | 1.25 |

| 0004 | D | 19.95 |

| 0000 | | 0.00 |

+---------+--------+-------+

8 rows in set (0.00 sec)