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。