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如何更新MySQL数据库中的两列？

2024-05-18 01:54:05 354

您可以使用用逗号(,)分隔的SET命令更新两列。语法如下-

UPDATE yourTableName SET yourColumnName1 = ’yourValue1’, yourColumnName2 = ’yourValue2’ where yourCondition;

为了理解上述语法，让我们创建一个表。创建表的查询如下-

create table StudentInformations
   -> (
   -> StudentId int not null auto_increment,
   -> StudentFirstName varchar(20),
   -> StudentLastName varchar(20),
   -> Primary Key(StudentId)
   -> );

使用insert命令在表中插入一些记录。查询如下-

insert into StudentInformations(StudentFirstName,StudentLastName)
values('John','Smith');

insert into StudentInformations(StudentFirstName,StudentLastName)
values('Carol','Taylor');

insert into StudentInformations(StudentFirstName,StudentLastName)
values('Mike','Jones');

insert into StudentInformations(StudentFirstName,StudentLastName)
values('Sam','Williams');

insert into StudentInformations(StudentFirstName,StudentLastName)
values('Bob','Davis');

insert into StudentInformations(StudentFirstName,StudentLastName)
values('David','Miller');

使用select语句显示表中的所有记录。查询如下-

select *from StudentInformations;

以下是输出。

+-----------+------------------+-----------------+
| StudentId | StudentFirstName | StudentLastName |
+-----------+------------------+-----------------+
|         1 | John             | Smith           |
|         2 | Carol            | Taylor          |
|         3 | Mike             | Jones           |
|         4 | Sam              | Williams        |
|         5 | Bob              | Davis           |
|         6 | David            | Miller          |
+-----------+------------------+-----------------+
6 rows in set (0.00 sec)

这是更新MySQL数据库中两列的查询。我们正在更新ID为3的学生的记录-

update StudentInformations set StudentFirstName = 'Robert',
StudentLastName = 'Brown' where
   -> StudentId = 3;
Rows matched − 1 Changed − 1 Warnings − 0

使用select语句检查表中的更新值。查询如下-

select *from StudentInformations;

以下是输出-

+-----------+------------------+-----------------+
| StudentId | StudentFirstName | StudentLastName |
+-----------+------------------+-----------------+
|         1 | John             | Smith           |
|         2 | Carol            | Taylor          |
|         3 | Robert           | Brown           |
|         4 | Sam              | Williams        |
|         5 | Bob              | Davis           |
|         6 | David            | Miller          |
+-----------+------------------+-----------------+
6 rows in set (0.00 sec)

现在，您可以在上面看到，StudentId3记录，即StudentFirstName和StudentLastName值已成功更改。

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如何更新MySQL数据库中的两列？

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