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

--try
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(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
) Paperlog
on 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--------------------