SQL update 语句

SQL UPDATE 语句

UPDATE 语句用于更新表中已存在的记录。

SQL UPDATE 语法

UPDATE table_name
SET column1=value1,column2=value2,...
WHERE some_column=some_value;

实例

实例表

+----+--------------+---------------------------+-------+---------+
| id | name         | url                       | alexa | country |
+----+--------------+---------------------------+-------+---------+
| 1  | Google       | https://www.google.cm/    | 1     | USA     |
| 2  | 淘宝          | https://www.taobao.com/   | 13    | CN      |
| 3  | Facebook     | https://www.facebook.com/ | 3     | USA     |
| 4  | 百度     | https://www.baidu.com/ | 4     | CN     |
+----+--------------+---------------------------+-------+---------+

修改 百度的 alexa排名

UPDATE Websites SET alexa='5000', country='CN' WHERE name='百度';

结果：

| 4  | 百度     | https://www.baidu.com/ | 5000     | CN     |