필드를 추가하고 다른 필드를 기반으로 값으로 채우기위한 SQL 문

Question

필드 (CheckNum)가 값을 반환하는지 여부에 따라 'Cash'또는 'check'값을 갖는 추가 필드를 쿼리에 추가하려고합니다. 번호를 확인하십시오. 위의 질의에 대한

SELECT t1.DocNum, t0.DocDate, t0.CardName, t0.CardCode, t1.CheckNum, t0.DocTotal 
FROM OVPM t0 INNER JOIN 
VPM1 t1 ON t1.docnum = t0.docnum LEFT OUTER JOIN 
OACT t2 ON t2.AcctCode = t1.CheckAct 

UNION ALL 

SELECT t1.DocNum, t0.DocDate, t0.CardName, t0.CardCode, t1.CheckNum, t0.DocTotal 
FROM ORCT t0 INNER JOIN 
     RCT1 t1 ON t1.docnum = t0.docnum LEFT OUTER JOIN 
     OACT t2 ON t2.AcctCode = t1.CheckAct 

샘플 결과 :

          CheckNum  DocTotal 
3 Alibhai shariff & Sons Ltd S0003  67901  39663.000000 
5 Silverstone Tyres (K) Ltd S0191  0   93200.000000 
6 Lam Limited     S0167  1372   66380.000000 
7 Osho Chemicals Industries S0198  0   21100.000000 

내가 좋아하는 것이 무엇을 :

          CheckNum  DocTotal   PayType 
3 Alibhai shariff & Sons Ltd S0003  67901  39663.000000  Check 
5 Silverstone Tyres (K) Ltd S0191  0   93200.000000  Cash 
6 Lam Limited     S0167  1372   66380.000000  Check 
7 Osho Chemicals Industries S0198  0   21100.000000  Cash 

어떤 도움에 감사드립니다.

Answer 1

여기서 CASE을 사용할 수 있습니다. 이처럼 -

SELECT t1.DocNum, t0.DocDate, t0.CardName, t0.CardCode, t1.CheckNum, t0.DocTotal, 
     CASE WHEN t1.CheckNum = 0 THEN 'Cash' ELSE 'Check' END AS PayType 
FROM OVPM t0 INNER JOIN 
     VPM1 t1 ON t1.docnum = t0.docnum LEFT OUTER JOIN 
     OACT t2 ON t2.AcctCode = t1.CheckAct 

UNION ALL 

SELECT t1.DocNum, t0.DocDate, t0.CardName, t0.CardCode, t1.CheckNum, t0.DocTotal, 
     CASE WHEN t1.CheckNum = 0 THEN 'Cash' ELSE 'Check' END AS PayType 
FROM ORCT t0 INNER JOIN 
     RCT1 t1 ON t1.docnum = t0.docnum LEFT OUTER JOIN 
     OACT t2 ON t2.AcctCode = t1.CheckAct