SQL Server 2005中的多部分標識符「X」無法綁定

Question

我想我有一個語法問題，但我在努力尋找答案...

任何人都可以解釋爲什麼

SELECT TOP 3 * FROM Facilities 
     INNER JOIN FacilityStates 
     ON FacilityStates.Asset = Facilities.ID 
     WHERE Facilities.ID = 'MyFacility' 

編譯並返回一個合適的結果，但我認爲是完全合格的版本

SELECT TOP 3 * FROM [dbo].[Facilities] 
       INNER JOIN [dbo].[FacilityStates] 
       ON [dbo].[FacilityStates.Asset] = [dbo].[Facilities.ID] 
       WHERE [dbo].[Facilities.ID] = 'MyFacility' 

拋出「多部分組成的標識符‘X’無法綁定。」對'on'子句和'where'子句的左側和右側部分？

Answer 1

因爲要結合你的Table.Column在一組方括號中：

.... 
ON [dbo].[FacilityStates.Asset] = [dbo].[Facilities.ID] 
.... 

這應該是：

.... 
ON [dbo].[FacilityStates].[Asset] = [dbo].[Facilities].[ID] 
.... 

在SQL Server方括號是用來明確表示對象名稱，可以包含空格或成爲保留字。因此，當您在一組括號內組合FacilityStates.Asset時，您告訴SQL Server有一個具有該名稱的對象。哪些沒有。

Answer 2

這是你方括號的位置：

SELECT TOP 3 * FROM [dbo].[Facilities] 
       INNER JOIN [dbo].[FacilityStates] 
       ON [dbo].[FacilityStates].[Asset] = [dbo].[Facilities].[ID] 
       WHERE [dbo].[Facilities].[ID] = 'MyFacility' 

Answer 3

揣摩方括號內的一切是一個名字。您將方括號表和字段名稱框在一起。有效查詢爲：

SELECT TOP 3 * 
FROM [dbo].[Facilities] 
INNER JOIN [dbo].[FacilityStates] 
    ON [dbo].[FacilityStates].[Asset] = [dbo].[Facilities].[ID] 
WHERE [dbo].[Facilities].[ID] = 'MyFacility'