为什么不匹配？

debugcn 发表于 Dev

justarand0mname

代码：

(SELECT 
[QBDATABASE].[dbo].[itemnoninventory].[FullName],
[LotTracker].[dbo].[tblParts].[PartNo],
[QBDATABASE].[dbo].[itemnoninventory].[CustomField2] AS StdCost,
[QBDATABASE].[dbo].[salesorpurchasedetail].[Price],
[QBDATABASE].[dbo].[itemnoninventory].[ListID],
[QBDATABASE].[dbo].[salesorpurchasedetail].[IDKEY]
FROM 
[QBDATABASE].[dbo].[itemnoninventory]
Inner JOIN
[QBDATABASE].[dbo].[salesorpurchasedetail] ON [QBDATABASE].[dbo].[itemnoninventory].[ListID] = [QBDATABASE].[dbo].[salesorpurchasedetail].[IDKEY]
INNER JOIN 
[LotTracker].[dbo].[tblParts] ON [QBDATABASE].[dbo].[itemnoninventory].[FullName] like [LotTracker].[dbo].[tblParts].[PartNo]
WHERE ([QBDATABASE].[dbo].[salesorpurchasedetail].[AccountRef_FullName] = 'Inventory, Raw Material')

我添加了不需要的选择来创建下面的示例结果屏幕截图。

ListID is varchar(255), null)
IDKEY is varchar(255), null)

问题：

什么会导致查询无法看到ListID = IDKEY的NULL结果吗？

编辑目标：

Stdcost应该匹配Price量，如果ListID=IDKEY和FullName=PartNo

未处理的异常肖恩

编辑后，如果 CustomField2 为空，则需要返回价格。这可以通过 ISNULL 或 COALESCE 来完成。如果第一个值为空，则 ISNULL 将返回第二个值。

(SELECT 
[QBDATABASE].[dbo].[itemnoninventory].[FullName],
[LotTracker].[dbo].[tblParts].[PartNo],
ISNULL([QBDATABASE].[dbo].[itemnoninventory].[CustomField2],[QBDATABASE].[dbo].[salesorpurchasedetail].[Price]) AS StdCost,
[QBDATABASE].[dbo].[salesorpurchasedetail].[Price],
[QBDATABASE].[dbo].[itemnoninventory].[ListID],
[QBDATABASE].[dbo].[salesorpurchasedetail].[IDKEY]
FROM 
[QBDATABASE].[dbo].[itemnoninventory]
Inner JOIN
[QBDATABASE].[dbo].[salesorpurchasedetail] ON [QBDATABASE].[dbo].[itemnoninventory].[ListID] = [QBDATABASE].[dbo].[salesorpurchasedetail].[IDKEY]
INNER JOIN 
[LotTracker].[dbo].[tblParts] ON [QBDATABASE].[dbo].[itemnoninventory].[FullName] like [LotTracker].[dbo].[tblParts].[PartNo]
WHERE ([QBDATABASE].[dbo].[salesorpurchasedetail].[AccountRef_FullName] = 'Inventory, Raw Material')

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