MS-SQL分页not in 方法改进之使用Max\Min

先看下表中共有多少条数据：

一百二十多万条，呵呵。

sql语句：

declare @d datetime

set @d = getdate()

select top 10 ID,U_Name,U_Age,U_Sex,U_Address from Test1 where ID not in (select top 9990 ID from Test1 order by ID) order by ID 

select [not in方法升序分页执行花费时间(毫秒)]=datediff(ms,@d,getdate()) 



declare @s datetime

set @s = getdate()

select top 10 ID,U_Name,U_Age,U_Sex,U_Address from Test1 where ID >=(select max(ID) from (select top 9991 ID from test1 order by ID) as T) order by ID

select [Max方法升序分页执行花费时间(毫秒)]=datediff(ms,@s,getdate()) 



declare @t datetime

set @t = getdate()

select top 10 ID,U_Name,U_Age,U_Sex,U_Address from Test1 where ID not in (select top 9990 ID from Test1 order by ID desc) order by ID desc 

select [not in方法降序分页执行花费时间(毫秒)]=datediff(ms,@t,getdate()) 



declare @q datetime

set @q = getdate()

select top 10 ID,U_Name,U_Age,U_Sex,U_Address from Test1 where ID <=(select min(ID) from (select top 9991 ID from Test1 order by ID desc) as T) order by ID desc

select [Min方法降序分页执行花费时间(毫秒)]=datediff(ms,@q,getdate())

分页效率一目了然！

两种方法的不同点之一就是计算第二个top中的值

not in 中计算公式为：

pgSize * (pgNo - 1)

max\min中计算公式为：

((pgNo-1)*pgSize+1)

pgNo为当前第几页，pgSize为每页几条数据。