向 MySQL 中现有 int 列的值中添加字符?


若要向现有 int 列值中添加字符,请使用 MySQL CONCAT()。我们先创建一个表 -

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

使用 insert 命令在表中插入一些记录 -

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 语句显示表中的所有记录 -

mysql> select *from DemoTable;

这将生成以下输出 -

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

以下是对列值添加字符的查询 -

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

这将生成以下输出 -

+-----------------------------+
| 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)

更新于: 09-10-2019

338 浏览量

开启属于您的职业

完成课程即可获得认证

入门
广告
© . All rights reserved.