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如何在MySQL中交换特定的字段值？

2024-05-13 10:15:23 420

让我们首先创建一个表-

mysql> create table DemoTable
(
   Id int NOT NULL AUTO_INCREMENT PRIMARY KEY,
   Number1 int,
   Number2 int
);

使用插入命令在表中插入一些记录-

mysql> insert into DemoTable(Number1,Number2) values(10,30);
mysql> insert into DemoTable(Number1,Number2) values(60,50);
mysql> insert into DemoTable(Number1,Number2) values(110,100);

使用select语句显示表中的所有记录-

mysql> select *from DemoTable;

这将产生以下输出-

+----+---------+---------+
| Id | Number1 | Number2 |
+----+---------+---------+
|  1 |      10 |      30 |
|  2 |      60 |      50 |
|  3 |     110 |     100 |
+----+---------+---------+
3 rows in set (0.00 sec)

现在让我们在MySQL中交换特定的字段值。在这里，我们交换ID为2的字段“Number1”和“Number2”-

mysql> update DemoTable
   set Number1=(@temporaryVariable:=Number1),
   Number1=Number2,
   Number2=@temporaryVariable
   where Id=2;
Rows matched: 1 Changed: 1 Warnings: 0

让我们再次检查表记录-

mysql> select *from DemoTable;

这将产生以下输出-

+----+---------+---------+
| Id | Number1 | Number2 |
+----+---------+---------+
|  1 |      10 |      30 |
|  2 |      50 |      60 |
|  3 |     110 |     100 |
+----+---------+---------+
3 rows in set (0.00 sec)

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如何在MySQL中交换特定的字段值？

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