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在MySQL中仅更新单个列值

2024-05-17 11:04:06 470

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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在MySQL中仅更新单个列值

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