MySQL 更新单行的多个列?
mysqlmysqli database更新于 2025/9/15 14:04:17
首先我们创建一个表 −
mysql> create table DemoTable -> ( -> FirstName varchar(100), -> Age int, -> Score int -> ); Query OK, 0 rows affected (0.62 sec)
使用 insert 命令在表中插入一些记录 −
mysql> insert into DemoTable values('Robert',21,78);
Query OK, 1 row affected (0.10 sec)
mysql> insert into DemoTable values('Bob',20,90);
Query OK, 1 row affected (0.21 sec)
mysql> insert into DemoTable values('Sam',22,69);
Query OK, 1 row affected (0.20 sec)
使用 select 语句显示表中的所有记录 −
mysql> select *from DemoTable;
输出
+-----------+------+-------+ | FirstName | Age | Score | +-----------+------+-------+ | Robert | 21 | 78 | | Bob | 20 | 90 | | Sam | 22 | 69 | +-----------+------+-------+ 3 rows in set (0.00 sec)
以下查询仅更新 FirstName 为"Bob"的行的 Age 和 Score 列。 −
mysql> update DemoTable -> set Age=25, -> Score=Score+9 -> where FirstName='Bob'; Query OK, 1 row affected (0.17 sec) Rows matched: 1 Changed: 1 Warnings: 0
让我们再次检查表记录 −
mysql> select *from DemoTable;
输出
+-----------+------+-------+ | FirstName | Age | Score | +-----------+------+-------+ | Robert | 21 | 78 | | Bob | 25 | 99 | | Sam | 22 | 69 | +-----------+------+-------+ 3 rows in set (0.00 sec)
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mysql 参考教程 - 该教程包含有关 mysql 的更多信息:https://www.cainiaomax.com/mysql/
