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

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
Nilsen
Fred
Kirkegt 56
Stavanger
Rasmussen
Nina
Storgt 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 Person
SET Address = 'Stien 12', City = 'Stavanger'
WHERE LastName = 'Rasmussen'

结果：

LastName
FirstName
Address
City
Nilsen
Fred
Kirkegt 56
Stavanger
Rasmussen
Nina
Stien 12
Stavanger