SQL 查询优化.....

mc_dv 2017-07-29 12:03:13

SELECT Row,hotelName,hotelEnName,hotelCode,HotelLevel,CityID,cityName,addstate,addStateVal FROM
( SELECT ROW_NUMBER() OVER (order by T.hotelCode desc) AS Row, T.* from
(select f.* from (select d.*,isnull(e.addState,'未新增') as addstate,case e.addState when '已新增' then '1' else '0' end as addStateVal
from (select a.name as hotelName,a.enname as hotelEnName,a.code as hotelCode,a.hotellevel,a.cityId,b.name as cityName from mt_hotel a
left join syscity b on a.cityid=b.id ) d left join (select '已新增' as addState,hotelCode from hotelandhoteluser where supplierCode='MT0000016')
e on d.hotelCode=e.hotelCode ) f where 1=1 ) T where 1=1 ) TT WHERE TT.Row between 333333 and 333343

SELECT Row,hotelName,hotelEnName,hotelCode,HotelLevel,CityID,cityName,addstate,addStateVal FROM ( SELECT ROW_NUMBER() OVER (order by T.hotelCode desc)AS Row, T.* from
(select f.* from (select d.*,isnull(e.addState,'未新增') as addstate,case e.addState when '已新增' then '1' else '0' end as addStateVal
from (select a.name as hotelName,a.enname as hotelEnName,a.code as hotelCode,a.hotellevel,a.cityId,b.name as cityName from mt_hotel a
left join syscity b on a.cityid=b.id ) d left join (select '已新增' as addState,hotelCode from hotelandhoteluser where supplierCode='MT0000016') e on d.hotelCode=e.hotelCode )
f where 1=1 ) T where 1=1 ) TT WHERE TT.Row between 21 and 30

第一个耗时20多秒，第二个毫秒级别.. 语句一样，就页码不一样.. SQL菜鸟，求大神指导.

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正怒月神 2017-09-20

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我这里单独测试了一下数据格式 select top 10 * from [dbo].[Test]

总条数 select COUNT(1) from [dbo].[Test]

简化的查询语句

select * from (
	select ROW_NUMBER() over(order by pname desc ) rowid, * from Test ) A
where rowid between 21 and 30

select * from (
	select ROW_NUMBER() over (order by pname desc ) rowid, * from Test ) A
where rowid between 333333 and 333343

查询出来，是1秒之内就可以的。那么应该和页码没有关系。我觉得你试试把left join去掉，然后ROW_NUMBER() OVER (order by T.hotelCode desc) 换ct

繁花尽流年 2017-09-20

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嵌套东西有点多，可以考虑先用作业定时固化数据，再单表分页查询，会好很多

顺势而为1 2017-09-20

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子查询太多, 建议先将子查询放到临时表中



SELECT  Row,hotelName,hotelEnName,hotelCode,HotelLevel,CityID,cityName,addstate,addStateVal 
 FROM ( SELECT ROW_NUMBER() OVER (order by T.hotelCode desc) AS Row, 
              T.*  
		from (select f.* 
		      from (select d.*,isnull(e.addState,'未新增') as addstate,case e.addState when '已新增' then '1' else '0' end as addStateVal
                    from (select a.name as hotelName,a.enname as hotelEnName,a.code as hotelCode,a.hotellevel,a.cityId,b.name as cityName 
					      from mt_hotel a 
                          left join syscity b on a.cityid=b.id ) d  
						  left join  (select '已新增' as addState,hotelCode 
						              from hotelandhoteluser 
									  where supplierCode='MT0000016')  e on d.hotelCode=e.hotelCode ) f  
			              where 1=1 ) T 
				     where 1=1  ) TT 
			 WHERE TT.Row between 333333 and 333343

mc_dv 2017-07-29

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二月十六版主 2017-07-29

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先看看执行计划一样吗

OwenZeng_DBA 2017-07-29

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引用楼主 a419816897 的回复:

SELECT Row,hotelName,hotelEnName,hotelCode,HotelLevel,CityID,cityName,addstate,addStateVal FROM ( SELECT ROW_NUMBER() OVER (order by T.hotelCode desc) AS Row, T.* from (select f.* from (select d.*,isnull(e.addState,'未新增') as addstate,case e.addState when '已新增' then '1' else '0' end as addStateVal from (select a.name as hotelName,a.enname as hotelEnName,a.code as hotelCode,a.hotellevel,a.cityId,b.name as cityName from mt_hotel a left join syscity b on a.cityid=b.id ) d left join (select '已新增' as addState,hotelCode from hotelandhoteluser where supplierCode='MT0000016') e on d.hotelCode=e.hotelCode ) f where 1=1 ) T where 1=1 ) TT WHERE TT.Row between 333333 and 333343 SELECT Row,hotelName,hotelEnName,hotelCode,HotelLevel,CityID,cityName,addstate,addStateVal FROM ( SELECT ROW_NUMBER() OVER (order by T.hotelCode desc)AS Row, T.* from (select f.* from (select d.*,isnull(e.addState,'未新增') as addstate,case e.addState when '已新增' then '1' else '0' end as addStateVal from (select a.name as hotelName,a.enname as hotelEnName,a.code as hotelCode,a.hotellevel,a.cityId,b.name as cityName from mt_hotel a left join syscity b on a.cityid=b.id ) d left join (select '已新增' as addState,hotelCode from hotelandhoteluser where supplierCode='MT0000016') e on d.hotelCode=e.hotelCode ) f where 1=1 ) T where 1=1 ) TT WHERE TT.Row between 21 and 30 第一个耗时20多秒，第二个毫秒级别.. 语句一样，就页码不一样.. SQL菜鸟，求大神指导.

没有执行计划，吧执行计划贴一下吧。另外可以先尝试吧相关表的统计信息都更新下，看看先