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使用单个MySQL查询更新两列

2024-04-23 11:52:07 463

为此，您只需要使用一次SET命令。让我们首先创建一个表-

mysql> create table DemoTable1909
   (
   Id int NOT NULL,
   FirstName varchar(20),
   LastName varchar(20)
   );

使用插入命令在表中插入一些记录-

mysql> insert into DemoTable1909 values(101,'John','Smith');
mysql> insert into DemoTable1909 values(102,'John','Doe');
mysql> insert into DemoTable1909 values(103,'Adam','Smith');
mysql> insert into DemoTable1909 values(104,'David','Miller');

使用select语句显示表中的所有记录-

mysql> select * from DemoTable1909;

这将产生以下输出-

+-----+-----------+----------+
| Id  | FirstName | LastName |
+-----+-----------+----------+
| 101 | John      |    Smith |
| 102 | John      |      Doe |
| 103 | Adam      |    Smith |
| 104 | David     |   Miller |
+-----+-----------+----------+
4 rows in set (0.00 sec)

这是更新两个列值的查询-

mysql> update DemoTable1909
     set FirstName='Carol',LastName='Taylor'
     where Id=103;
Rows matched: 1  Changed: 1 Warnings: 0

让我们再次检查表记录-

mysql> select * from DemoTable1909;

这将产生以下输出-

+-----+-----------+----------+
| Id  | FirstName | LastName |
+-----+-----------+----------+
| 101 | John      |    Smith |
| 102 | John      |      Doe |
| 103 | Carol     |   Taylor |
| 104 | David     |   Miller |
+-----+-----------+----------+
4 rows in set (0.00 sec)

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使用单个MySQL查询更新两列

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