Question

有人可以将此语句转换为SQL Server中的CASE语句吗？

IIf((LoanBalance)=0 And CurrentPrincipal<>0 And EndPaymentDate>MaxOfPayment_Date,iif(Pledged_Loan=True,1,2), IIf(LoanBalance=0 And currentprincipal<>0,3,IIf(OffCycle_Payment=True,4,5))) AS POFF

Answer 1

CASE语句级联（意味着选择了第一个匹配条件而没有其他条件）。因此，您不必使用case嵌套逻辑：

SELECT (CASE WHEN LoanBalance = 0 And CurrentPrincipal <> 0 And 
                  EndPaymentDate > MaxOfPayment_Date and
                  Pledged_Loan = True
             THEN 1
             WHEN LoanBalance = 0 And CurrentPrincipal <> 0 And 
                  EndPaymentDate > MaxOfPayment_Date
             THEN 2
             WHEN LoanBalance = 0 And CurrentPrincipal <> 0
             THEN 3
             WHEN OffCycle_Payment = True
             THEN 4
             ELSE 5
       END) AS POFF

Answer 2

我认为这将是这样的事情：

CASE WHEN   LoanBalance=0
        And CurrentPrincipal<>0
        And EndPaymentDate>MaxOfPayment_Date
        THEN CASE WHEN Pledged_Loan=True THEN 1 ELSE 2 END
    WHEN LoanBalance=0
        And currentprincipal<>0
        THEN 3
    WHEN OffCycle_Payment=True
    THEN 4 ELSE 5 END END AS POFF

啊，我相信SQL Server中的布尔值会被存储为一点，所以这样就可以了：

CASE WHEN   LoanBalance=0
        And CurrentPrincipal<>0
        And EndPaymentDate>MaxOfPayment_Date
        THEN CASE WHEN Pledged_Loan=1 THEN 1 ELSE 2 END
    WHEN LoanBalance=0
        And currentprincipal<>0
        THEN 3
    WHEN OffCycle_Payment=1
    THEN 4 ELSE 5 END END AS POFF

Answer 3

试试这个

SELECT CASE WHEN LoanBalance = 0 
                 AND CurrentPrincipal <> 0 
                 AND EndPaymentDate > MaxOfPayment_Date
            THEN CASE WHEN Pledged_Loan
                      THEN 1
                      ELSE 2
            END
            ELSE CASE WHEN LoanBalance = 0 AND currentprincipal <> 0
                      THEN 3
                      ELSE CASE WHEN OffCycle_Payment
                                THEN 4
                                ELSE 5
                           END
                 END
        END AS POFF

将IIF语句转换为case语句

3 个答案: