將SQL查詢轉換爲MS Access SQL

Question

試圖讓我的SQL查詢在MS Access中工作，但它不想。我試圖找到一個指南或有關此事，因爲我知道它發生了很多時間，它通常只是添加一些括號，但我還沒有能夠得到這個查詢工作，儘管我所有的嘗試：

SELECT t1.Name AS lev1, t2.Name as lev2, t3.Name as lev3, t4.Name as lev4 
FROM Folder AS t1 
LEFT JOIN Folder AS t2 ON t2.Parent = t1.ObjId 
LEFT JOIN Folder AS t3 ON t3.Parent = t2.ObjId 
LEFT JOIN Folder AS t4 ON t4.Parent = t3.ObjId 
WHERE t1.ObjId = '123456789'; 

Answer 1

MS Access需要每個連接周圍的括號。當你擁有多表連接，你將有幾個：

SELECT t1.Name AS lev1, t2.Name as lev2, t3.Name as lev3, t4.Name as lev4 
FROM ((Folder AS t1 
LEFT JOIN Folder AS t2 ON t2.Parent = t1.ObjId) 
LEFT JOIN Folder AS t3 ON t3.Parent = t2.ObjId) 
LEFT JOIN Folder AS t4 ON t4.Parent = t3.ObjId 
WHERE t1.ObjId = '123456789'; 

格式化它看起來像這樣：

SELECT t1.Name AS lev1, t2.Name as lev2, t3.Name as lev3, t4.Name as lev4 
FROM 
(
    (
     Folder AS t1 
     LEFT JOIN Folder AS t2 ON t2.Parent = t1.ObjId 
    ) 
    LEFT JOIN Folder AS t3 ON t3.Parent = t2.ObjId 
) 
LEFT JOIN Folder AS t4 ON t4.Parent = t3.ObjId 
WHERE t1.ObjId = '123456789';