如何更新 MySQL 中单行中的多列?
我们先创建一个表 -
mysql> create table DemoTable -> ( -> FirstName varchar(100), -> Age int, -> Score int -> ); Query OK, 0 rows affected (0.62 sec)
使用插入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;
结果
+-----------+------+-------+ | FirstName | Age | Score | +-----------+------+-------+ | Robert | 21 | 78 | | Bob | 20 | 90 | | Sam | 22 | 69 | +-----------+------+-------+ 3 rows in set (0.00 sec)
以下是更新 FirstName 为“Bob”的行的 Age 和 Score 列的查询 -
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
让我们再次查看表记录 -
mysql> select *from DemoTable;
结果
+-----------+------+-------+ | FirstName | Age | Score | +-----------+------+-------+ | Robert | 21 | 78 | | Bob | 25 | 99 | | Sam | 22 | 69 | +-----------+------+-------+ 3 rows in set (0.00 sec)
广告