在MySQL中仅更新单个列值
让我们首先创建一个表-
mysql> create table DemoTable1605 -> ( -> StudentId int NOT NULL AUTO_INCREMENT PRIMARY KEY, -> StudentName varchar(20), -> StudentCountryName varchar(20) -> );
使用插入命令在表中插入一些记录-
mysql> insert into DemoTable1605(StudentName,StudentCountryName) values('Adam','AUS');
mysql> insert into DemoTable1605(StudentName,StudentCountryName) values('John','US');
mysql> insert into DemoTable1605(StudentName,StudentCountryName) values('Bob','UK');使用select语句显示表中的所有记录-
mysql> select * from DemoTable1605;
这将产生以下输出-
+-----------+-------------+--------------------+ | StudentId | StudentName | StudentCountryName | +-----------+-------------+--------------------+ | 1 | Adam | AUS | | 2 | John | US | | 3 | Bob | UK | +-----------+-------------+--------------------+ 3 rows in set (0.00 sec)
以下是在MySQL中仅更新单个列值的查询-
mysql> update DemoTable1605 set StudentName='Chris' where StudentCountryName='UK'; Rows matched: 1 Changed: 1 Warnings: 0
让我们再次检查表记录-
mysql> select * from DemoTable1605;
这将产生以下输出-
+-----------+-------------+--------------------+ | StudentId | StudentName | StudentCountryName | +-----------+-------------+--------------------+ | 1 | Adam | AUS | | 2 | John | US | | 3 | Chris | UK | +-----------+-------------+--------------------+ 3 rows in set (0.00 sec)
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