SQL指南-Update 语句
Update 语句
Update 语句用于修改表中的数据。
语法
UPDATE table_name SET column_name = new_value WHERE column_name = some_value |
---------------------------------
Person:
LastName | FirstName | Address | City |
---|---|---|---|
Nilsen | Fred | Kirkegt 56 | Stavanger |
Rasmussen | Storgt 67 |
---------------------------------
连续更新一列
我们想给last name为"Rasmussen"的人添加first name
UPDATE Person SET FirstName = \'Nina\' WHERE LastName = \'Rasmussen\' |
返回结果:
LastName | FirstName | Address | City |
---|---|---|---|
Nilsen | Fred | Kirkegt 56 | Stavanger |
Rasmussen | Nina | Storgt 67 |
---------------------------------
连续更新多列
我们想改变地址并添加城市名称
UPDATE Person SET Address = \'Stien 12\', City = \'Stavanger\' WHERE LastName = \'Rasmussen\' |
返回结果
LastName | FirstName | Address | City |
---|---|---|---|
Nilsen | Fred | Kirkegt 56 | Stavanger |
Rasmussen | Nina | Stien 12 | Stavanger |