SQL Server 2012中的where子句的內部聯接

Question

我嘗試了所有答案，但都沒有工作。但是，當我只使用一個列狀態或LGA時，代碼正在工作。當我將二者結合起來，你可以在查詢中發現下面我得到一個錯誤：

Msg 102, Level 15, State 1, Line 1
Incorrect syntax near ','.

請幫我

代碼：

SELECT [Community].[CommunityID], 
     [Community].[CommunityName], 
     [Community].[StateID], 
     [StateName] AS [StateName], 
     [Community.LGAID], 
     [LGA].[LGName] AS [LGName] 
FROM [Community], [State] 
WHERE ([Community].[StateID] = [State].[StateID], [LGA] 
WHERE [Community].[LGAID] = [LGA].[LGAID] 

Answer 1

我認爲你正在嘗試做加盟並且它是LGA附近的語法錯誤，您可以將其轉換爲以下代碼以提供顯式連接條件：

SELECT [Community].[CommunityID], [Community].[CommunityName], [Community].[StateID], [StateName] AS [StateName], [Community].[LGAID], [LGA].[LGName] AS [LGName] 
FROM [Community] JOIN [State] ON [Community].[StateID] = [State].[StateID] 
JOIN [LGA] ON [Community].[LGAID]=[LGA].[LGAID]