Несколько операторов IF в SQL

Question

Я пытаюсь написать несколько условий IF в инструкции sql. Я хочу знать, что IF SMB равен 1, а затем проверьте, является ли ACT, REN или REP равным 1, выберите столбец QF из соответствующей таблицы, и я хочу, чтобы один ответ был как «a» и «b» в качестве его суммы.

Input : 

@SMB = 1,@Dealer = 0, @Act = 1, @Ren = 1, @Rep = 1 


tblACT: 
QF 
1 
2 

tblREP 
QF 
1 
2 

tblREN 
QF 
1 
2 


OUTPUT : 
a b 
6 0 

@SMB bit = 1, 
@Dealer bit = 1, 
@Act bit = 1, 
@Ren bit = 1, 
@Rep bit = 1 

Select SUM(tbl.a), SUM(tbl.b) from 
(If @SMB ='1' 
    If @ACT ='1' 
     CASE WHEN QF IN (1,2) THEN 1 ELSE 0 as a 
     CASE WHEN QF IN (4,5) THEN 1 ELSE 0 as b from tblACT 
    union all 
    If @REN='1' 
     CASE WHEN QF IN (1,2) THEN 1 ELSE 0 as a 
     CASE WHEN QF IN (4,5) THEN 1 ELSE 0 as b from tblREN 
    union all 
    If @REP='1' 
     CASE WHEN QF IN (1,2) THEN 1 ELSE 0 as a 
     CASE WHEN QF IN (4,5) THEN 1 ELSE 0 as b from tblREP 
union all 
If @Dealer ='1' 
    If @ACT ='1' 
     CASE WHEN QF IN (1,2) THEN 1 ELSE 0 as a 
     CASE WHEN QF IN (4,5) THEN 1 ELSE 0 as b from tblACT 
    union all 
    If @REN='1' 
     CASE WHEN QF IN (1,2) THEN 1 ELSE 0 as a 
     CASE WHEN QF IN (4,5) THEN 1 ELSE 0 as b from tblREN 
    union all 
    If @REP='1' 
     CASE WHEN QF IN (1,2) THEN 1 ELSE 0 as a 
     CASE WHEN QF IN (4,5) THEN 1 ELSE 0 as b from tblREP) as tbl 

Answer 1

Попробуйте это и дайте мне знать.

CREATE TABLE #tmp 
( 
    QF INT 
) 

INSERT INTO #tmp VALUES (1) 
INSERT INTO #tmp VALUES (2) 
INSERT INTO #tmp VALUES (4) 
INSERT INTO #tmp VALUES (4) 
INSERT INTO #tmp VALUES (5) 


DECLARE @SMB bit ,@Dealer BIT,@Act bit ,@Ren BIT,@Rep bit 
SET @SMB = 1 
SET @Dealer = 1 
SET @Act = 1 
SET @Ren = 1 
SET @Rep = 1 

SELECT SUM((CASE WHEN (@SMB = 1 
          OR @Dealer = 1 
         ) 
         AND @ACT = 1 
         AND QF IN (1, 2) THEN 1 
        WHEN (@SMB = 1 
          OR @Dealer = 1 
         ) 
         AND @REN = 1 
         AND QF IN (1, 2) THEN 1 
        WHEN (@SMB = 1 
          OR @Dealer = 1 
         ) 
         AND @REP = 1 
         AND QF IN (1, 2) THEN 1 
        ELSE 0 
       END)) AS A , 
     SUM((CASE WHEN (@SMB = 1 
          OR @Dealer = 1 
         ) 
         AND @ACT = 1 
         AND QF IN (4, 5) THEN 1 
        WHEN (@SMB = 1 
          OR @Dealer = 1 
         ) 
         AND @REN = 1 
         AND QF IN (4, 5) THEN 1 
        WHEN (@SMB = 1 
          OR @Dealer = 1 
         ) 
         AND @REP = 1 
         AND QF IN (4, 5) THEN 1 
        ELSE 0 
       END)) AS B 
FROM #tmp