基於IF條件插入選擇表變量

Question

我已聲明一個表變量@OpeningTable。我想使用Insert Select插入一些基於某些條件的值。我寫這在下文中給出一個說法：

DECLARE @OpeningTable TABLE 
    (
    ItemID INT, OpeningBalance DECIMAL(15,3) 
) 
INSERT INTO @OpeningTable 
SELECT 

    IF EXISTS (SELECT ItemID, OpeningBalance FROM str_stockdaily WHERE stockdate = @FromDate AND (JobOrderid = @JobOrderID OR @JobOrderID = -1) AND (CustomerID = @CustomerID OR @CustomerID = -1) AND (ItemID = @ItemID OR @ItemID = -1)) 
      SELECT ItemID, OpeningBalance FROM str_stockdaily WHERE stockdate = @FromDate AND (JobOrderid = @JobOrderID OR @JobOrderID = -1) AND (CustomerID = @CUstomerID OR @CustomerID=-1) AND (ItemID = @ItemID OR @ItemID = -1) 
    ELSE 
      IF EXISTS (SELECT ItemID FROM str_stockdaily WHERE stockdate = ISNULL((SELECT MAX(stockdate) FROM str_stockdaily WHERE stockdate < @FromDate AND (JobOrderid = @JobOrderID OR @JobOrderID = -1) AND (CustomerID = @CUstomerID OR @CustomerID = -1) AND (ItemID = @ItemID OR @ItemID = -1)), 0) AND (JobOrderid = @JobOrderID OR @JobOrderID = -1) AND (CustomerID = @CUstomerID OR @CustomerID = -1) AND (ItemID = @ItemID OR @ItemID = -1)) 
       SELECT ItemID, closingbalance AS OpeningBalance FROM str_stockdaily WHERE stockdate = (SELECT MAX(stockdate) FROM str_stockdaily WHERE stockdate = @FromDate AND (JobOrderid = @JobOrderID OR @JobOrderID = -1) AND (CustomerID = @CUstomerID OR @CustomerID = -1) AND (ItemID = @ItemID OR @ItemID = -1)) AND (JobOrderid = @JobOrderID OR @JobOrderID = -1) AND (CustomerID = @CUstomerID OR @CustomerID = -1) AND (ItemID = @ItemID OR @ItemID = -1) 
      ELSE 
       SELECT ItemID, 0.000 AS OpeningBalance FROM str_item 

但它給人的錯誤：

"Incorrect syntax near the keyword 'IF'

我不知道我是否已經寫了正確的查詢與否。如何解決這個問題呢？請我需要您的建議..

Answer 1

DECLARE @OpeningTable TABLE 
    (
    ItemID INT, OpeningBalance DECIMAL(15,3) 
) 
--INSERT INTO @OpeningTable 
--SELECT 

    IF EXISTS (SELECT ItemID, OpeningBalance FROM str_stockdaily WHERE stockdate = @FromDate AND (JobOrderid = @JobOrderID OR @JobOrderID = -1) AND (CustomerID = @CUstomerID OR @CustomerID = -1) AND (ItemID = @ItemID OR @ItemID = -1)) 
     INSERT INTO @OpeningTable 
     SELECT ItemID, OpeningBalance 
     FROM str_stockdaily 
     WHERE stockdate = @FromDate AND (JobOrderid = @JobOrderID OR @JobOrderID = -1) AND (CustomerID = @CUstomerID OR @CustomerID=-1) AND (ItemID = @ItemID OR @ItemID = -1) 
    ELSE 
     IF EXISTS (SELECT ItemID FROM str_stockdaily WHERE stockdate = ISNULL((SELECT MAX(stockdate) FROM str_stockdaily WHERE stockdate < @FromDate AND (JobOrderid = @JobOrderID OR @JobOrderID = -1) AND (CustomerID = @CUstomerID OR @CustomerID = -1) AND (ItemID = @ItemID OR @ItemID = -1)), 0) AND (JobOrderid = @JobOrderID OR @JobOrderID = -1) AND (CustomerID = @CUstomerID OR @CustomerID = -1) AND (ItemID = @ItemID OR @ItemID = -1)) 
      INSERT INTO @OpeningTable 
      SELECT ItemID, closingbalance AS OpeningBalance 
      FROM str_stockdaily 
      WHERE stockdate = (SELECT MAX(stockdate) FROM str_stockdaily WHERE stockdate = @FromDate AND (JobOrderid = @JobOrderID OR @JobOrderID = -1) AND (CustomerID = @CUstomerID OR @CustomerID = -1) AND (ItemID = @ItemID OR @ItemID = -1)) AND (JobOrderid = @JobOrderID OR @JobOrderID = -1) AND (CustomerID = @CUstomerID OR @CustomerID = -1) AND (ItemID = @ItemID OR @ItemID = -1) 
     ELSE 
      INSERT INTO @OpeningTable 
      SELECT ItemID, 0.000 AS OpeningBalance 
      FROM str_item