MS-SQL分页not in 方法改进之使用row_number
上一篇博客对比了not in 和 max\min分页的效率,这次来看看row_number分页效率如何
在网上扒了一个row_number的分页存储过程,源地址:http://bbs.csdn.net/topics/300185125,在这里稍加修改,使之更加灵活
create proc Proc_TablePage --表名 @tablename nvarchar(20), --查询字段 @selcolumn nvarchar(1000), --排序字段 @sortcolumn nvarchar(255), --每页记录数 @pagecount int, --页号 @pageindex int as declare @beginrow int declare @endrow int set @beginrow=0 set @endrow=0 set @beginrow=(@pageindex-1)*@pagecount+1 set @endrow=@pageindex*@pagecount declare @sqlstr nvarchar(4000) set @sqlstr='with table1 as(select '+ @selcolumn +',ROW_NUMBER() OVER(ORDER BY '+ @sortcolumn+' ) AS ROW'+ ' FROM '+@tablename+') ' set @sqlstr=@sqlstr +' SELECT '+ @selcolumn +' FROM TABLE1 WHERE ROW BETWEEN '+cast(@beginrow as nvarchar )+' and '+cast(@endrow as nvarchar) exec(@sqlstr)
not in max\min 和row_Number三者sql:
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 @u datetime set @u = getdate() exec Proc_TablePage 'Test1',' ID, U_Name,U_Age,U_Address,U_Sex ','ID desc',10,1000 select [Row_Number方法降序分页执行花费时间(毫秒)]=datediff(ms,@u,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())
执行结果:
由此得出结论:三者的分页效率从高到低依次是Max\Min、row_number、not in!