向 MySQL 中現有 int 列的值中新增字元?


若要向現有 int 列值中新增字元,請使用 MySQL CONCAT()。我們先建立一個表 -

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記錄 -

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 語句顯示錶中的所有記錄 -

mysql> select *from DemoTable;

這將生成以下輸出 -

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

以下是對列值新增字元的查詢 -

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

這將生成以下輸出 -

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

更新於: 09-10-2019

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