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Update 语句用于修改表中的数据。
UPDATE 表名称 SET 列名称 = 新值 WHERE 列名称 = 某值
LastName
FirstName
Address
City
Gates
Bill
Xuanwumen 10
Beijing
Wilson
Champs教程-Elysees
我们为 lastname 是 "Wilson" 的人添加 firstname:
UPDATE Person SET FirstName = "Fred" WHERE LastName = "Wilson"
LastName
FirstName
Address
City
Gates
Bill
Xuanwumen 10
Beijing
Wilson
Fred
Champs-Elysees
我们会修改地址(address),并添加城市名称(city):
UPDATE Person SET Address = "Zhongshan 23", City = "Nanjing"
WHERE LastName = "Wilson"
LastName
FirstName
Address
City
Gates
Bill
Xuanwumen 10
Beijing
Wilson
Fred
Zhongshan 23
Nanjing