如何在MySQL数据库中更新两个列？

您可以使用以逗号(,)分隔的SET命令更新两个列。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 −

mysql> create table StudentInformations
   -> (
   -> StudentId int not null auto_increment,
   -> StudentFirstName varchar(20),
   -> StudentLastName varchar(20),
   -> Primary Key(StudentId)
   -> );
Query OK, 0 rows affected (0.57 sec)

使用插入命令在表中插入一些记录。查询如下 −

mysql> insert into StudentInformations(StudentFirstName,StudentLastName)
values('John','Smith');
Query OK, 1 row affected (0.16 sec)

mysql> insert into StudentInformations(StudentFirstName,StudentLastName)
values('Carol','Taylor');
Query OK, 1 row affected (0.17 sec)

mysql> insert into StudentInformations(StudentFirstName,StudentLastName)
values('Mike','Jones');
Query OK, 1 row affected (0.13 sec)

mysql> insert into StudentInformations(StudentFirstName,StudentLastName)
values('Sam','Williams');
Query OK, 1 row affected (0.16 sec)

mysql> insert into StudentInformations(StudentFirstName,StudentLastName)
values('Bob','Davis');
Query OK, 1 row affected (0.14 sec)

mysql> insert into StudentInformations(StudentFirstName,StudentLastName)
values('David','Miller');
Query OK, 1 row affected (0.20 sec)

使用select语句显示表中的所有记录。查询如下 −

mysql> select *from StudentInformations;

输出如下。

+-----------+------------------+-----------------+
| 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)

以下是在MySQL数据库中更新两个列的查询。我们正在更新StudentId为3的学生记录 −

mysql> update StudentInformations set StudentFirstName = 'Robert',
StudentLastName = 'Brown' where
   -> StudentId = 3;
Query OK, 1 row affected (0.12 sec)
Rows matched − 1 Changed − 1 Warnings − 0

使用select语句检查表中的更新值。查询如下 −

mysql> select *from StudentInformations;

输出如下 −

+-----------+------------------+-----------------+
| 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)

现在你可以看到，上述学生记录的StudentId 3，StudentFirstName和StudentLastName的值已成功更改。

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