mysql-zerofill关键字

zerofill位数填充

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> insert into shop values(1,'A',3.45),(1,'B',3.99),(2,'A',10.99),(3,'B',1.4
5),(3,'C',1.69),(3,'D',1.25),(4,'D',19.95);
Query OK, 7 rows affected (0.01 sec)
Records: 7  Duplicates: 0  Warnings: 0

mysql> select * from shop;
+---------+--------+-------+
| article | dealer | price |
+---------+--------+-------+
|    0001 | A      |  3.45 |
|    0001 | B      |  3.99 |
|    0002 | A      | 10.99 |