多個左連接到單個表

Question

我有表的一大堆：

Table1: PersonID, A1, A2, A3, ... 

Table2: PersonID, B1, B2, B3, ... 

Table3: PersonID, C1, C2, C3, ... 

Table4: PersonID, D1, D2, D3, ... 

... 

表1是特殊的，因爲它實際上包含所有個人（姓名和個人信息），但所有其他表幾乎肯定缺少行（一個人根本沒有參加那個活動）。

我想要做的是將所有表連接在一起（通過普通的PersonID），以便任何缺失的屬性都會留空。所以，當然，我想用外連接。這是我試過的：

SELECT * 

FROM Table1, Table2, Table3, Table4, Table5, Table6 

LEFT OUTER JOIN Table2 ON Table1.PersonID = Table2.PersonID 
LEFT OUTER JOIN Table3 ON Table1.PersonID = Table3.PersonID 
LEFT OUTER JOIN Table4 ON Table1.PersonID = Table4.PersonID 
LEFT OUTER JOIN Table5 ON Table1.PersonID = Table5.PersonID 
LEFT OUTER JOIN Table6 ON Table1.PersonID = Table6.PersonID 

所有這一切都給我一個記憶超載。我想我不知道如何把所有桌子上的笛卡爾積放在一起，這一切都在窒息。有沒有一個好的方法來做到這一點？

在此先感謝！

Answer 1

更改此：

SELECT * 

FROM Table1, Table2, Table3, Table4, Table5, Table6 

LEFT OUTER JOIN Table2 ON Table1.PersonID = Table2.PersonID 
LEFT OUTER JOIN Table3 ON Table1.PersonID = Table3.PersonID 
LEFT OUTER JOIN Table4 ON Table1.PersonID = Table4.PersonID 
LEFT OUTER JOIN Table5 ON Table1.PersonID = Table5.PersonID 
LEFT OUTER JOIN Table6 ON Table1.PersonID = Table6.PersonID 

這樣：

SELECT * 

FROM Table1 
LEFT OUTER JOIN Table2 ON Table1.PersonID = Table2.PersonID 
LEFT OUTER JOIN Table3 ON Table1.PersonID = Table3.PersonID 
LEFT OUTER JOIN Table4 ON Table1.PersonID = Table4.PersonID 
LEFT OUTER JOIN Table5 ON Table1.PersonID = Table5.PersonID 
LEFT OUTER JOIN Table6 ON Table1.PersonID = Table6.PersonID 

是，喲服用的所有表的笛卡爾乘積，然後離開它連接到其他

Answer 2

使用此：

SELECT * 
FROM Table1 
LEFT OUTER JOIN Table2 ON Table1.PersonID = Table2.PersonID 
LEFT OUTER JOIN Table3 ON Table1.PersonID = Table3.PersonID 
LEFT OUTER JOIN Table4 ON Table1.PersonID = Table4.PersonID 
LEFT OUTER JOIN Table5 ON Table1.PersonID = Table5.PersonID 
LEFT OUTER JOIN Table6 ON Table1.PersonID = Table6.PersonID 

看那SQL Joins形式的更多信息。