SQL 服務器中的條件交叉申請

Question

我有以下查詢，它工作得很好：

版本 #1

SELECT 
    t.ScheduleId,t.BaseDate,t.AfterDate,  
    fn.ScheduleDate AS NextBillingDate
INTO 
    #Distinct_BillableMemberAgreementItems
FROM 
    Distinct_BillableMemberAgreementItems_CTE t
CROSS APPLY 
    dbo.fn_ScheduleCalculator(t.ScheduleId, t.BaseDate, t.AfterDate, 0, 1, NULL, NULL, NULL) fn

此外，我對上述查詢進行了以下更改，這些更改也可以正常工作：

版本 #2

SELECT 
    t.ScheduleId, t.BaseDate, t.AfterDate, t.memberagreementitemid,  
    fn.ScheduleDate AS NextBillingDate
INTO 
    #Distinct_BillableMemberAgreementItems
FROM 
    Distinct_BillableMemberAgreementItems_CTE t
CROSS APPLY 
    dbo.fn_ScheduleCalculator(t.ScheduleId, t.BaseDate, COALESCE(t.PreviousBillingDate, t.BaseDate), 0, 2, NULL, NULL, NULL) fn
WHERE
    fn.RowNumber = 2

問題

現在，基於某種條件，我想在用戶定義的 function dbo.fn_ScheduleCalculator中傳遞不同的參數，但我無法正確使用語法。

這是我想要實現的目標：

SELECT 
    t.ScheduleId, t.BaseDate, t.AfterDate, t.memberagreementitemid,  
    fn.ScheduleDate AS NextBillingDate
INTO 
    #Distinct_BillableMemberAgreementItems
FROM 
    Distinct_BillableMemberAgreementItems_CTE t
CROSS APPLY
IF ((COALESCE(t.PreviousBillingDate, t.LastInvoicedDate) = GETDATE()) 
    OR (t.BaseDate <> GETDATE() and t.FromBilling = 0))

    dbo.fn_ScheduleCalculator(t.ScheduleId, t.BaseDate, COALESCE(t.PreviousBillingDate, t.BaseDate), 0, 2, NULL, NULL, NULL) fn
    WHERE
        fn.RowNumber = 2
ELSE
    dbo.fn_ScheduleCalculator(t.ScheduleId, t.BaseDate, t.AfterDate, 0, 1, NULL, NULL, NULL) fn)

我知道，如果不共享上述表格的一些數據，很難就如何實現我正在尋找的內容提出確切的語法建議，但即使有人可以建議我如何實現我正在尋找的內容，或者如果有任何問題您看到並可以指出的語法將有很大幫助。

這里：

dbo.fn_ScheduleCalculator ：是用戶定義的 function

Distinct_BillableMemberAgreementItems_CTE ：是一個 CTE

Answer 1

隨着對要求的澄清，您需要使用兩個查詢和 UNION ALL 將這兩個查詢合並在一起。 按照當前的要求，它將是這樣的。

SELECT t.ScheduleId
    , t.BaseDate
    , t.AfterDate
    , t.memberagreementitemid
    , fn.ScheduleDate AS NextBillingDate
INTO #Distinct_BillableMemberAgreementItems
FROM Distinct_BillableMemberAgreementItems_CTE t
CROSS APPLY dbo.fn_ScheduleCalculator(t.ScheduleId, t.BaseDate, COALESCE(t.PreviousBillingDate, t.BaseDate), 0, 2, NULL, NULL, NULL) fn
where 
(
    COALESCE(t.PreviousBillingDate, t.LastInvoicedDate) = GETDATE()
    OR 
    (
        t.BaseDate <> GETDATE() 
        and 
        t.FromBilling = 0
    )
)
AND fn.RowNumber = 2

UNION ALL

SELECT t.ScheduleId
    , t.BaseDate
    , t.AfterDate
    , t.memberagreementitemid
    , fn.ScheduleDate AS NextBillingDate
INTO #Distinct_BillableMemberAgreementItems
FROM Distinct_BillableMemberAgreementItems_CTE t
CROSS APPLY dbo.fn_ScheduleCalculator(t.ScheduleId, t.BaseDate, t.AfterDate, 0, 1, NULL, NULL, NULL) fn
where NOT
(
    COALESCE(t.PreviousBillingDate, t.LastInvoicedDate) = GETDATE()
    OR 
    (
        t.BaseDate <> GETDATE() 
        and 
        t.FromBilling = 0
    )
)

Answer 2

您可以使用帶有虛擬表的CROSS APPLY進行一些計算，然后將這些計算傳遞給 function。

我不知道計算的含義，所以我只是給了它們通用名稱。 我也不知道你的邏輯是否正確，我只是復制了你所展示的內容。

SELECT 
    t.ScheduleId,
    t.BaseDate,
    t.AfterDate,
    t.memberagreementitemid,  
    fn.ScheduleDate AS NextBillingDate
INTO 
    #Distinct_BillableMemberAgreementItems
FROM 
    Distinct_BillableMemberAgreementItems_CTE t

CROSS APPLY (
    SELECT
        CASE WHEN ISNULL(t.PreviousBillingDate, t.LastInvoicedDate) = GETDATE()
               OR (t.BaseDate <> GETDATE() AND t.FromBilling = 0)
          THEN ISNULL(t.PreviousBillingDate, t.BaseDate)
          ELSE t.AfterDate
        END,
        CASE WHEN ISNULL(t.PreviousBillingDate, t.LastInvoicedDate) = GETDATE()
               OR (t.BaseDate <> GETDATE() AND t.FromBilling = 0)
          THEN 2
          ELSE 1
        END
) v1(SomeCalculation1, SomeCalculation2)

CROSS APPLY dbo.fn_ScheduleCalculator(
    t.ScheduleId,
    t.BaseDate,
    v.SomeCalculation1,
    0,
    v.SomeCalculation2,
    NULL, NULL, NULL
  ) fn
WHERE
    (v1.SomeCalculation2 = 1 OR fn.RowNumber = 2);