SQL初学者教程:学会使用SQL UPDATE语句_[SQL Server教程]
Update 语句
Update 语句用于修改表中的数据。
语法:
UPDATE table_nameSET column_name = new_valueWHERE column_name = some_value
Person:
LastName | FirstName | Address | City | NilsenFredKirkegt 56StavangerRasmussen Storgt 67
更新某一行中的一个列
我们为last name是"Rasmussen"的人添加first name:
UPDATE Person SET FirstName = 'Nina'WHERE LastName = 'Rasmussen'
结果:
LastName | FirstName | Address | City | NilsenFredKirkegt 56StavangerRasmussenNinaStorgt 67
更新某一行中的若干列
我们会修改地址(address),并添加城市名称(name of the city):
UPDATE PersonSET Address = 'Stien 12', City = 'Stavanger'WHERE LastName = 'Rasmussen'
结果:
LastName | FirstName | Address | City | NilsenFredKirkegt 56StavangerRasmussenNinaStien 12Stavanger