用 MySQL 单个查询修改多个列?
使用 MySQL 中的 UPDATE 和 REPLACE() 更新记录。我们先创建一个表格 -
mysql> create table DemoTable -> ( -> StudentId int NOT NULL AUTO_INCREMENT PRIMARY KEY, -> StudentName varchar(100), -> StudentCountryName varchar(100) -> ); Query OK, 0 rows affected (0.67 sec)
使用插入命令在表格中插入一些记录 -
mysql> insert into DemoTable(StudentName,StudentCountryName) values('John','US'); Query OK, 1 row affected (0.15 sec)
使用选择语句显示表格中的所有记录 -
mysql select *from DemoTable;
输出
将产生以下输出 -
+-----------+-------------+--------------------+ | StudentId | StudentName | StudentCountryName | +-----------+-------------+--------------------+ | 1 | John | US | +-----------+-------------+--------------------+ 1 row in set (0.00 sec)
以下是更新多列的查询 -
mysql> update DemoTable -> set StudentName=replace(StudentName,'John','Chris'), -> StudentCountryName=replace(StudentCountryName,'US','UK'); Query OK, 1 row affected (0.69 sec) Rows matched: 1 Changed: 1 Warnings: 0
让我们再次检查表格记录 -
mysql> select *from DemoTable;
输出
将产生以下输出 -
+-----------+-------------+--------------------+ | StudentId | StudentName | StudentCountryName | +-----------+-------------+--------------------+ | 1 | Chris | UK | +-----------+-------------+--------------------+ 1 row in set (0.00 sec)
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