UPDATE别名正确写法

 1 /*Update 语句
 2 
 3 Update 语句用于修改表中的数据
 4 
 5 UPDATE 表名称 SET 列名称 = 新值 WHERE 列名称 = 某值
 6 
 7 UPDATE 表别名 SET 列名称 = 新值 FROM 表名称 表别名  WHERE 列名称 = 某值*/
 8 
 9 USE AdventureWorks2008R2
10 SELECT * FROM Person.Address
11 
12 SELECT * FROM Person.Address where AddressID=527
13 UPDATE Person.Address SET AddressLine2='test1'  where AddressID=527
14 --UPDATE别名错误写法
15 UPDATE Person.Address AS T1 SET T1.AddressLine2='test1'  where AddressID=527
16 --UPDATE别名正确写法
17 update t  set AddressLine2 ='test2' from Person.Address t where AddressID = 527
18 
19 /*--常规写法
20 UPDATE Person SET FirstName = 'Fred' WHERE LastName = 'Wilson' 
21 UPDATE Person SET Address = 'Zhongshan 23', City = 'Nanjing'
22 WHERE LastName = 'Wilson'
23 */