常用的分页 上海

1）NOT IN

declare @timediff datetime
declare @pageIndex int
declare @pageSize int
declare @sql varchar(500)
set @pageIndex=1
set @pageSize=10
set @timediff=GetDATE()
set @sql='select top ('+cast(@pageSize as varchar)+') * from testTable where (id not in (
select top '+cast(@pageSize*(@pageIndex-1) as varchar)+' id from testTable order by id)) order by id'
exec(@sql)
select datediff(ms,@timediff,Getdate())

@pageIndex=1时，运行：0ms（给力啊！）

@pageIndex=50000时，运行：346ms（怎么50000页就不给力了）

@pageIndex=100000时，运行：326ms（怎么比50000页时还少了？）

2）MAX()

declare @timediff datetime
declare @pageIndex int
declare @pageSize int
declare @sql varchar(500)
set @timediff=GetDATE()
set @pageIndex=1
set @pageSize=10
set @sql='select top ('+cast(@pageSize as varchar)+') * from testTable where (id >= (select MAX(id) from (select top '+cast((@pageSize*(@pageIndex-1)+1) as varchar)+' id from testTable order by id) as a)) order by id'
exec(@sql)
select datediff(ms,@timediff,Getdate())

@pageIndex=1时，运行：0ms（也是很给力啊！）

@pageIndex=50000时，运行：123ms（不错）

@pageIndex=100000时，运行：220ms（页数和查询时间成正比）

3）Row_Number()

declare @timediff datetime
declare @pageIndex int
declare @pageSize int
declare @sql varchar(500)
set @timediff=GetDATE()
set @pageIndex=1
set @pageSize=10
set @sql='select * from (select *,row_number() over (order by id asc) as RowIndex from testTable) as IDWithRowNumber where RowIndex between '+cast(((@pageIndex-1)*@pageSize)+1 as varchar)+' and '+cast(@pageIndex*@pageSize as varchar)+''
exec(@sql)
select datediff(ms,@timediff,getdate())

@pageIndex=1时，运行：0ms（好吧……数据量小的时候都是这尿性）

@pageIndex=50000时，运行：280ms（略逊色）

@pageIndex=100000时，运行：580ms（这货居然也是页数和查询时间成正比！坑爹吧！）

4）临时表

declare @timediff datetime
declare @pageIndex int
declare @pageSize int
declare @sql varchar(500)
declare @str varchar(500)
set @timediff=GetDATE()
set @pageIndex=1
set @pageSize=10
set @str='with tempTable as (select ceiling((Row_number() over (order by id asc))/'+cast(@pageSize as varchar)+') as page_num,* from testTable)'
set @sql=@str+'select * from tempTable where page_num='+cast(@pageIndex-1 as varchar)+''
exec(@sql)
select datediff(ms,@timediff,getdate())

@pageIndex=1时，运行：280ms（不咧个是吧！这非主流啊）

@pageIndex=50000时，运行：280ms（这不科学……）

@pageIndex=100000时，运行：280ms（好吧，这货不受页数的影响，永远都这速度）

5）中间变量

declare @timediff datetime
declare @pageIndex int
declare @pageSize int
declare @count int
declare @id int
declare @sql varchar(500)
set @pageIndex=1
set @pageSize=10
select @id=0,@count=0,@timediff=GetDATE()
select @count=@count+1,@id=case when @count=(@pageIndex-1)*@pageSize then id else @id end from testTable order by id
set @sql='select top '+cast(@pageSize as varchar)+' * from testTable where id>'+cast(@id as varchar)+''
exec(@sql)
select datediff(ms,@timediff,getdate())