在单个MySQL查询中更改多个列？
为此，请使用UPDATE和REPLACE()MySQL。让我们首先创建一个表-
mysql> create table DemoTable -> ( -> StudentId int NOT NULL AUTO_INCREMENT PRIMARY KEY, -> StudentName varchar(100), -> StudentCountryName varchar(100) -> );
使用插入命令在表中插入一些记录-
mysql> insert into DemoTable(StudentName,StudentCountryName) values('John','US');使用select语句显示表中的所有记录-
mysql select *from DemoTable;
输出结果
这将产生以下输出-
+-----------+-------------+--------------------+ | StudentId | StudentName | StudentCountryName | +-----------+-------------+--------------------+ | 1 | John | US | +-----------+-------------+--------------------+ 1 row in set (0.00 sec)
以下是更新多列的查询-
mysql> update DemoTable -> set StudentName=replace(StudentName,'John','Chris'), -> StudentCountryName=replace(StudentCountryName,'US','UK'); Rows matched: 1 Changed: 1 Warnings: 0
让我们再次检查表记录-
mysql> select *from DemoTable;
输出结果
这将产生以下输出-
+-----------+-------------+--------------------+ | StudentId | StudentName | StudentCountryName | +-----------+-------------+--------------------+ | 1 | Chris | UK | +-----------+-------------+--------------------+ 1 row in set (0.00 sec)