在 MySQL WHERE 子句中使用多个值进行更新
mysqli mysqldatabase更新于 2025/8/11 20:28:17
首先我们创建一个表 −
mysql> create table DemoTable -> ( -> Id int, -> Name varchar(20), -> Age int, -> CountryName varchar(10) -> ); Query OK, 0 rows affected (0.81 sec)
使用 insert 命令在表中插入一些记录 −
mysql> insert into DemoTable values(100,'Chris',34,'AUS'); Query OK, 1 row affected (0.21 sec) mysql> insert into DemoTable values(101,'Chris',31,'US'); Query OK, 1 row affected (0.21 sec) mysql> insert into DemoTable values(102,'David',25,'UK'); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable values(103,'Carol',28,'AUS'); Query OK, 1 row affected (0.21 sec)
使用 select 语句显示表中的所有记录 −
mysql> select * from DemoTable;
这将产生以下输出 −
+------+-------+------+-------------+ | Id | Name | Age | CountryName | +------+-------+------+-------------+ | 100 | Chris | 34 | AUS | | 101 | Chris | 31 | US | | 102 | David | 25 | UK | | 103 | Carol | 28 | AUS | +------+-------+------+-------------+ 4 rows in set (0.00 sec)
这是在 WHERE 子句中使用多个值进行更新的查询−
mysql> update DemoTable -> set Name='Robert' -> where Age=31 and CountryName='US'; Query OK, 1 row affected (0.44 sec) Rows matched: 1 Changed: 1 Warnings: 0
让我们再次检查表记录 −
mysql> select * from DemoTable;
这将产生以下输出 −
+------+--------+------+-------------+ | Id | Name | Age | CountryName | +------+--------+------+-------------+ | 100 | Chris | 34 | AUS | | 101 | Robert | 31 | US | | 102 | David | 25 | UK | | 103 | Carol | 28 | AUS | +------+--------+------+-------------+ 4 rows in set (0.00 sec)
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