MySQL将前导数字添加到列中的现有ID

2022-01-17 00:00:00 sql-update mysql phpmyadmin

我有一个名为 country_id 的 mysql 数据库列,例如:

I got a mysql database column named country_id, like:

country_id
----------
1
2
59
435
2714

我现在要完成的是为每个 ID 添加前导零,因此结果将是:

What I'm trying to accomplish now is to add leading zero's to each ID, so the result would be:

country_id
----------
0001
0002
0059
0435
2714

每个 ID 最多应包含 4 位数字.就是这样.

Each ID should have max 4 digits. That's it.

我可以在 PHPmyAdmin 中使用任何 SQL 语句以上述方式更新这个 country_id 列吗?

Is there any SQL statement I could use in PHPmyAdmin to update this country_id column in the way described above?

最好的问候!

推荐答案

在列上声明ZEROFILL:

mysql> create table foobar (nr integer(4) ZEROFILL);
Query OK, 0 rows affected (0.31 sec)

mysql> INSERT INTO foobar VALUES (1),(12),(123),(1234),(12345);
Query OK, 5 rows affected (0.05 sec)
Records: 5  Duplicates: 0  Warnings: 0

mysql> SELECT * FROM foobar;
|  0001 
|  0012 
|  0123 
|  1234 
| 12345 

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