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+  After触发器
+After触发器要求只有执行某一操作insert、update、delete之后触发器才被触发，且只能定义在表上。
+
+  Instead of 触发器 
+Instead of 触发器表示并不执行其定义的操作（insert、update、delete）而仅是执行触发器本身。既可以在表上定义instead of触发器，也可以在视图上定义。
+
+INSTEAD OF 触发器用来代替通常的触发动作，即当对表进行INSERT、UPDATE 或 DELETE 操作时，系统不是直接对表执行这些操作，而是把操作内容交给触发器，
+让触发器检查所进行的操作是否正确。如正确才进行相应的操作。因此，INSTEAD OF 触发器的动作要早于表的约束处理。
+
+ 分页查询 
+
+--一页几条  5
+declare @PageSize int = 6
+--第几页
+declare @Page int = 2
+
+--一页5条
+--前5条： 第一页
+--select top @PageSize * from Student   
+--where StuId  not in (select top 5*(1-1) stuid from Student)
+----第二页
+--select top @PageSize * from Student
+--where StuId  not in (select top 5*(2-1) stuid from Student)
+
+--第三页
+select top (@PageSize) * from Student
+where Stuid not in (select top ((@PageSize)*(@page-1)) stuid from student)
+
+
+--between  and   一页5条
+select * from Student where stuid between 1 and 5
+select * from Student where stuid between 6 and 10
+select * from Student where stuid between 11 and 15
+
+--窗口函数   5    
+--@PageSize = 5  @Page = 2   5*(1-1)+1   5*(2-1)+1    5*(3-1)+1
+
+
+declare @PageSize int = 5
+--第几页
+declare @Page int = 3
+--select * from 
+--(select ROW_NUMBER() over(order by stuid) as rid ,* from Student) as Temp
+--where rid between 1 and  5
+
+select stuid,StuName,StuSex from 
+(select ROW_NUMBER() over(order by stuid) as rid ,* from Student) as Temp
+where rid between @PageSize*(@Page-1)+1 and  @PageSize*@Page
+
+--第n页
+select * from 
+(select ROW_NUMBER() over(order by stuid) as rid ,* from Student) as Temp
+where rid between 11 and  15
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