访问多个左连接 - SQL代码

Question

我试图在Microsoft Access中连接三个表格，允许使用Table 1作为我的主表的空条目，以便显示所有记录。

我有这个代码工作链接只有2个表。

SELECT [1].IDCode, [2].GiftDate, [2].FundId__1, [2].fund_name 
FROM 1 LEFT JOIN 2 ON [1].IDCode = [2].IDCode 
WHERE ((([1].IDCode) Is Not Null)); 

但是我想补充一点。我有这个，但每次我尝试运行它时，都会收到一个错误（无效的操作）。

SELECT [1].IDCode, [2].GiftDate, [2].FundId__1, [2].fund_name, [3].Rep_Type 
FROM (1 LEFT JOIN 2 ON [1].IDCode = [2].IDCode) LEFT JOIN 3 ON [1].IDCode = [3].IDCode 
WHERE ((([1].IDCode) Is Not Null)); 

我的代码现在是这个，我仍然收到无效操作。

SELECT [A].IDCode, [A].GiftDate, [A].FundId__1, [A].fund_name, [3].Rep_Type 
FROM 
(SELECT [1].IDCode, [2].GiftDate, [2].FundId__1, [2].fund_name 
FROM 1 
LEFT JOIN 2 
ON [1].IDCode = [2].IDCode) A 
LEFT JOIN 3 
ON [A].IDCode = [3].IDCode 
WHERE ((([1].IDCode) Is Not Null)); 

Answer 1

如果1 - > 2 - > 3，然后加入上第三应该是2.idcode = 3.idcode

SELECT [1].IDCode, [2].GiftDate, [2].FundId__1, [2].fund_name, [3].Rep_Type 
FROM (1 LEFT JOIN 2 ON [1].IDCode = [2].IDCode) LEFT JOIN 3 ON [2].IDCode = [3].IDCode 
WHERE ((([1].IDCode) Is Not Null)); 

但是，如果加入真的回来了1 ...

由于访问是挑剔的（）的和连接回2.

所以我不迷失与（）的我刚刚创建内嵌视图来管理连接。

SELECT [A].IDCode, [A].GiftDate, [A].FundId__1, [A].fund_name, [3].Rep_Type 
FROM 
(SELECT [1].IDCode, [2].GiftDate, [2].FundId__1, [2].fund_name 
FROM 1 
LEFT JOIN 2 
    ON [1].IDCode = [2].IDCode) A 
LEFT JOIN 3 
    ON [A].IDCode = [3].IDCode 
WHERE [A].IDCode Is Not Null;