求sql话语优化

求sql语句优化

SQL code

select invent.cDepotId,invent.cprodid ,case when in_iQuantity is null then 0 else in_iQuantity end in_iQuantity ,case when in_iSuCentiare is null then 0 else in_iSuCentiare end in_iSuCentiare ,case when in_iSuAmt is null then 0 else in_iSuAmt end in_iSuAmt ,case when ou_iQuanTity is null then 0 else ou_iQuanTity end ou_iQuanTity ,case when ou_iSuCentiare is null then 0 else ou_iSuCentiare end ou_iSuCentiare from  (select depot.cDepotId,cDepotName,invent.cClassId,cProdid,cProdName,iCentiare,cSpecif,cUnit from invent FULL OUTER JOIN depot on invent.cProdid<>depot.cDepotId )invent left join (select cDepotId,paperlog.cProdId,sum(iQuanTity)in_iQuanTity,sum(iSuCentiare)in_iSuCentiare,sum(iSuAmt)in_iSuAmt   from paperlog,papClass  where paperlog.cPapcType=papClass.cPapcType and paperlog.iyear=2012 and paperlog.imonth=7 and papClass.cPapcName='入库' group by cDepotId,cProdId) inPaperlog on invent.cProdId=inPaperlog.cProdid and invent.cDepotId=inPaperlog.cDepotId left join (select cDepotId,paperlog.cProdId,sum(iQuanTity)ou_iQuanTity,sum(iSuCentiare)ou_iSuCentiare from paperlog,papClass  where paperlog.cPapcType=papClass.cPapcType and paperlog.iyear=2012 and paperlog.imonth=7 and papClass.cPapcName='出库' group by cDepotId,cProdId)ouPaperlog on invent.cProdId=ouPaperlog.cProdId and invent.cDepotId=ouPaperlog.cDepotId  where in_iQuantity<>0 or in_iSuCentiare<>0 or in_iSuAmt<>0 or ou_iQuanTity<>0 or ou_iSuCentiare<>0 order by invent.cprodid,invent.cDepotId

这个语句，执行不了，Sql服务器好像死循环了
如果把
where in_iQuantity<>0 or in_iSuCentiare<>0 or in_iSuAmt<>0 or ou_iQuanTity<>0 or ou_iSuCentiare<>0 
这句给删除了，查询出来的记录也才80000多条
为什么会这样呢？

求师兄师姐给指点一下，谢谢！

[解决办法]
case when in_iQuantity is null then 0 else in_iQuantity 

这样的可以换成ISNULL(in_iQuantity ,0)

另外你的子查询也太多了 都是嵌套。
[解决办法]
建议是使用临时表处理掉一部分子查询
[解决办法]

SQL code

--tryselect invent.cDepotId,invent.cprodid         ,case when in_iQuantity is null then 0 else in_iQuantity end in_iQuantity         ,case when in_iSuCentiare is null then 0 else in_iSuCentiare end in_iSuCentiare         ,case when in_iSuAmt is null then 0 else in_iSuAmt end in_iSuAmt         ,case when ou_iQuanTity is null then 0 else ou_iQuanTity end ou_iQuanTity         ,case when ou_iSuCentiare is null then 0 else ou_iSuCentiare end ou_iSuCentiare from  (    select depot.cDepotId,cDepotName,invent.cClassId,cProdid,cProdName,iCentiare,cSpecif,cUnit     from invent FULL OUTER JOIN depot on invent.cProdid<>depot.cDepotId )invent left join (    select cDepotId,paperlog.cProdId,            sum(case when papClass.cPapcName = '入库'  then iQuanTity else null end) as in_iQuanTity,            sum(case when papClass.cPapcName = '入库'  then iSuCentiare else null end) as iSuCentiare,            sum(case when papClass.cPapcName = '入库'  then iSuAmt else null end) as iSuAmt,            sum(case when papClass.cPapcName = '出库'  then iQuanTity else null end) as ou_iQuanTity,            sum(case when papClass.cPapcName = '出库'  then iSuCentiare else null end) as ou_iSuCentiare    from paperlog,papClass      where paperlog.cPapcType=papClass.cPapcType and paperlog.iyear=2012 and paperlog.imonth=7      group by cDepotId,cProdId) Paperlogon invent.cProdId=Paperlog.cProdid and invent.cDepotId=Paperlog.cDepotId where in_iQuantity<>0 or in_iSuCentiare<>0 or in_iSuAmt<>0 or ou_iQuanTity<>0 or ou_iSuCentiare<>0 order by invent.cprodid,invent.cDepotId
------解决方案-------------------- 
 
写的太复杂了，多个表关联，里面还存在group by，这样必然会慢，而且还很多<>

建议做以下修改
第一种方式
1、使用存储过程或sql自定义函数，
2、分拆以上的sql语句，单独三个临时表，并给临时表创建索引
临时表一
select depot.cDepotId,cDepotName,invent.cClassId,cProdid,cProdName,iCentiare,cSpecif,cUnit  
from invent FULL OUTER JOIN depot on invent.cProdid<>depot.cDepotId

临时表二
select cDepotId,paperlog.cProdId,sum(iQuanTity)in_iQuanTity,sum(iSuCentiare)in_iSuCentiare,sum(iSuAmt)in_iSuAmt  
from paperlog,papClass 
where paperlog.cPapcType=papClass.cPapcType and paperlog.iyear=2012 and paperlog.imonth=7 and papClass.cPapcName='入库'  
group by cDepotId,cProdId) inPaperlog on invent.cProdId=inPaperlog.cProdid and invent.cDepotId=inPaperlog.cDepotId  

临时表三
select cDepotId,paperlog.cProdId,sum(iQuanTity)ou_iQuanTity,sum(iSuCentiare)ou_iSuCentiare  
from paperlog,papClass 
where paperlog.cPapcType=papClass.cPapcType and paperlog.iyear=2012 and paperlog.imonth=7 and papClass.cPapcName='出库'  
group by cDepotId,cProdId

然后再进行表关联




[解决办法]
探讨

SQL code

select invent.cDepotId,invent.cprodid 
,case when in_iQuantity is null then 0 else in_iQuantity end in_iQuantity 
,case when in_iSuCentiare is null then 0 else in_iSuCentiare end in_iSuCent……
 

 

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