在一条MySql查询中更改多列？

使用MySql中的UPDATE和REPLACE()实现。让我们首先创建一个表−

mysql> create table DemoTable
   -> (
   -> StudetnId int NOT NULL AUTO_INCREMENT PRIMARY KEY,
   -> StudentName varchar(100),
   -> StudentCountryName varchar(100)
   -> );
Query OK, 0 rows affected (0.67 sec)

使用insert命令在表中插入一些记录−

mysql> insert into DemoTable(StudentName,StudentCountryName) values('John','US');
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;

阅读更多：MySQL 教程

输出

将生成以下输出−

+-----------+-------------+--------------------+
| StudentId | StudentName | StudentCountryName |
+-----------+-------------+--------------------+
|         1 | John        | US                 |
+-----------+-------------+--------------------+
1 row in set (0.00 sec)

以下是更新多列的查询语句−

mysql> update DemoTable
   -> set StudentName=replace(StudentName,'John','Chris'),
   -> StudentCountryName=replace(StudentCountryName,'US','UK');
Query OK, 1 row affected (0.69 sec)
Rows matched: 1 Changed: 1 Warnings: 0

再次检查一下表中的记录−

mysql> select *from DemoTable;

输出

将生成以下输出−

+-----------+-------------+--------------------+
| StudentId | StudentName | StudentCountryName |
+-----------+-------------+--------------------+
|         1 | Chris       | UK                 |
+-----------+-------------+--------------------+
1 row in set (0.00 sec)