在MySQL中给现有的 int 列添加字符？

要在现有的 int 列值中添加字符，请使用MySQL CONCAT()函数。首先让我们创建一个表 –

mysql> create table DemoTable
(
   Amount int
);
Query OK, 0 rows affected (1.44 sec)

使用插入命令将一些记录插入表中 –

mysql> insert into DemoTable values(709);
Query OK, 1 row affected (0.67 sec)
mysql> insert into DemoTable values(34560);
Query OK, 1 row affected (0.30 sec)
mysql> insert into DemoTable values(90854);
Query OK, 1 row affected (0.28 sec)
mysql> insert into DemoTable values(3456);
Query OK, 1 row affected (0.15 sec)

使用 select 语句从表中显示所有记录 –

mysql> select *from DemoTable;

这将产生以下输出 –

+--------+
| Amount |
+--------+
|  709   |
| 34560  |
| 90854  |
|  3456  |
+--------+
4 rows in set (0.00 sec)

以下是将字符添加到列值的查询 –

mysql> select concat('The Product Amount is=',Amount) AS AddingCharacters from DemoTable;

这将产生以下输出 –

+-----------------------------+
| AddingCharacters             |
+-----------------------------+
| The Product Amount is=709   |
| The Product Amount is=34560 |
| The Product Amount is=90854 |
| The Product Amount is=3456  |
+-----------------------------+
4 rows in set (0.00 sec)