语法:
UPDATE 表 SET 列 = 新值 WHERE 列名 = 某值
Person:
LastName |
FirstName |
Address |
City |
Gates |
Bill |
Xuanwumen 10 |
Beijing |
Wilson |
|
Champs-Elysees |
|
例:更新某一行中的一个列
我们为Lastname 是 "Wilson" 的人添加 firstname:
UPDATE Person SET FirstName = 'Fred' WHERE LastName = 'Wilson'
结果:
LastName |
FirstName |
Address |
City |
Gates |
Bill |
Xuanwumen 10 |
Beijing |
Wilson |
Fred |
Champs-Elysees |
|
例:更新某一行中的若干列
下面我们修改地址(address),并添加城市(city):
UPDATE Person SET Address = 'Zhongshan 23', City = 'Nanjing'
WHERE LastName = 'Wilson'
结果:
LastName |
FirstName |
Address |
City |
Gates |
Bill |
Xuanwumen 10 |
Beijing |
Wilson |
Fred |
Zhongshan 23 |
Nanjing |