基于IF条件插入选择表变量

Question

我已声明一个表变量@OpeningTable。我想使用Insert Select插入一些基于某些条件的值。我写这在下文中给出一个说法：

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 

但它给人的错误：

"Incorrect syntax near the keyword 'IF'

我不知道我是否已经写了正确的查询与否。如何解决这个问题呢？请我需要您的建议..

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