減去兩個case語句

Question

數據庫：SQL Server

希望這很簡單。我有一個採購訂單查詢，我試圖減去兩個案例的陳述，但我有問題得到它的工作。我使用臨時表來拉在採購訂單數據

參見下面的查詢：

--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減去從積分的購買，以獲得淨總採購訂單。做這項工作的最佳方式是什麼？

Answer 1

關注你的case語句 - 你要根據情況進行總結。

之後，最可讀的將是把它變成一個子查詢或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

夫婦的方式......一個是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