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通过单个查询将MySQL表的所有列设置为特定值

2024-04-26 08:56:05 393

让我们首先创建一个表-

mysql> create table DemoTable
(
   ClientId int NOT NULL AUTO_INCREMENT PRIMARY KEY,
   ClientName varchar(40),
   ClientAge int,
   ClientCountryName varchar(40)
);

使用插入命令在表中插入一些记录-

mysql> insert into DemoTable(ClientName,ClientAge,ClientCountryName) values('Chris',25,'US');
mysql> insert into DemoTable(ClientName,ClientAge,ClientCountryName) values('Bob',55,'UK');
mysql> insert into DemoTable(ClientName,ClientAge,ClientCountryName) values('David',45,'AUS');

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-

+----------+------------+-----------+-------------------+
| ClientId | ClientName | ClientAge | ClientCountryName |
+----------+------------+-----------+-------------------+
|        1 | Chris      | 25        | US                |
|        2 | Bob        | 55        | UK                |
|        3 | David      | 45        | AUS               |
+----------+------------+-----------+-------------------+
3 rows in set (0.00 sec)

这是将MySQL表的所有列设置为特定值的查询-

mysql> update DemoTable
   set ClientName='Sam',ClientAge=48,ClientCountryName='AUS' where ClientId=2;
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-

+----------+------------+-----------+-------------------+
| ClientId | ClientName | ClientAge | ClientCountryName |
+----------+------------+-----------+-------------------+
|        1 | Chris      |        25 | US                |
|        2 | Sam        |        48 | AUS               |
|        3 | David      |        45 | AUS               |
+----------+------------+-----------+-------------------+
3 rows in set (0.00 sec)

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通过单个查询将MySQL表的所有列设置为特定值

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