减去两个case语句

Question

数据库：SQL Server

希望这很简单。我有一个采购订单查询，我试图减去两个案例的陈述，但我有问题得到它的工作。我使用临时表来拉在采购订单数据

参见下面的查询：

--temp table for PO Inventory lines 
select 
prchseordr_id, 
ISNULL (sum(prchseordrlst_cst_extndd),0) as Inv_Cost 
INTO #TempPOInv 

from prchseordr 
left outer join prchseordrlst on prchseordr.prchseordr_rn = prchseordrlst.prchseordr_rn 
where prchseordr_nxt_id = '' 
group by prchseordr_id 
-------------------- 
--temp table for PO General lines 
select 
prchseordr_id, 
ISNULL (sum(prchseordrlstgn_cst_extndd),0) as Gen_Cost 
INTO #TempPOGen 

from prchseordr 
left outer join prchseordrlstgn on prchseordr.prchseordr_rn = prchseordrlstgn.prchseordr_rn 
where prchseordr_nxt_id = '' 
group by prchseordr_id 
-------------------- 
--temp table for PO Subcontractor lines 
select 
prchseordr_id, 
ISNULL (sum(prchseordrlstsb_cntrct_amnt_orgnl),0) as Sub_Cost 
INTO #TempPOSub 

from prchseordr 
left outer join prchseordrlstsb on prchseordr.prchseordr_rn = prchseordrlstsb.prchseordr_rn 
where prchseordr_nxt_id = '' 
group by prchseordr_id 

------------------------------------------------------------ 
Select 
vndr_nme as [Vendor Name], 
sum(CASE WHEN prchseordr_type = 'Purchase' THEN Inv_Cost + Gen_Cost + Sub_Cost else 0 end) Purchases, 
sum(CASE WHEN prchseordr_type = 'Credit' THEN Inv_Cost + Gen_Cost + Sub_Cost else 0 end) Credits 
from prchseordr 
left outer join #TempPOInv on prchseordr.prchseordr_id = #TempPOInv.prchseordr_id 
left outer join #TempPOGen on prchseordr.prchseordr_id = #TempPOGen.prchseordr_id 
left outer join #TempPOSub on prchseordr.prchseordr_id = #TempPOSub.prchseordr_id 
join vndr on prchseordr.vndr_rn = vndr.vndr_rn 
where prchseordr.prchseordr_entrd_dte between @DateStart@ and @DateEnd@ 
and prchseordr_rn <> 0 
group by vndr_nme,prchseordr_type 
order by vndr_nme 


DROP TABLE #TempPOInv 
DROP TABLE #TempPOGen 
DROP TABLE #TempPOSub 

非常基本的我只是想减去从积分的购买，以获得净总采购订单。做这项工作的最佳方式是什么？

Answer 1

关注你的case语句 - 你要根据情况进行总结。

之后，最可读的将是把它变成一个子查询或CTE，如：

select 
    x.[Vendor Name] 
    ,x.Credits - x.Purchases [Profit] 
from 
(
    Select 
     vndr_nme as [Vendor Name], 
     sum(CASE WHEN prchseordr_type = 'Purchase' THEN Inv_Cost + Gen_Cost + Sub_Cost else 0 end) Purchases, 
     sum(CASE WHEN prchseordr_type = 'Credit' THEN Inv_Cost + Gen_Cost + Sub_Cost else 0 end) Credits 
    From ... 
) x 

或者：

;with x as (
    Select 
     vndr_nme as [Vendor Name], 
     sum(CASE WHEN prchseordr_type = 'Purchase' THEN Inv_Cost + Gen_Cost + Sub_Cost else 0 end) Purchases, 
     sum(CASE WHEN prchseordr_type = 'Credit' THEN Inv_Cost + Gen_Cost + Sub_Cost else 0 end) Credits 
    From ... 
) 
select 
    x.[Vendor Name] 
    ,x.Credits - x.Purchases [Profit] 
from x 

Answer 2

夫妇的方式......一个是CTE

;with cte as(
Select 
vndr_nme as [Vendor Name], 
sum(CASE WHEN prchseordr_type = 'Purchase' THEN Inv_Cost + Gen_Cost + Sub_Cost else 0 end) Purchases, 
sum(CASE WHEN prchseordr_type = 'Credit' THEN Inv_Cost + Gen_Cost + Sub_Cost else 0 end) Credits 
from prchseordr 
left outer join #TempPOInv on prchseordr.prchseordr_id = #TempPOInv.prchseordr_id 
left outer join #TempPOGen on prchseordr.prchseordr_id = #TempPOGen.prchseordr_id 
left outer join #TempPOSub on prchseordr.prchseordr_id = #TempPOSub.prchseordr_id 
join vndr on prchseordr.vndr_rn = vndr.vndr_rn 
where prchseordr.prchseordr_entrd_dte between @DateStart@ and @DateEnd@ 
and prchseordr_rn <> 0 
group by vndr_nme,prchseordr_type) 

select 
    [Vendor Name], 
    Purchases, 
    Credits, 
    Purchases - Credits as NewColumn 
from cte