SQL：语法错误（缺少运算符）

Question

我一点也不擅长 SQL

我在 MS Access 数据库中有两个表

|ID| Name  |Surname|Postion|           |EmpID|ManID|
----------------------------           ------------- 
|1 |Scrooge|McDuck |Manager|           |3    |1    |
|2 |Daisy  |Duck   |Manager|           |7    |1    |
|3 |Donald |Duck   |Support|           |6    |2    | 
|4 |Minny  |Mouse  |Support|           |4    |2    |
|5 |Mickey |Mouse  |Support|           |2    |1    |
|6 |Goofy  |       |Support|           |1    |2    |
|7 |Pluto  |       |Support|           |5    |2    |
|8 |Huey   |Duck   |Support|
|9 |Dewey  |Duck   |Support|
|10|Louie  |Duck   |Support|

我需要编写一条 SQL 语句来产生以下输出

| Name  |Surname|Postion|Manager Name|Manager Positon|          
------------------------            
|Donald |Duck   |Support|Scrooge     |Manager         
|Pluto  |       |Support|Scrooge     |Manager         
|Goofy  |       |Support|Daisy       |Manager        
|Minny  |Mouse  |Support|Daisy       |Manager       
|Daisy  |Duck   |Support|Scrooge     |Manager        
|Scrooge|McDuck |Manager|Daisy       |Manager        
|Mickey |Mouse  |Manager|Daisy       |Manager 

到目前为止，我的代码看起来像这样（我一直在网上查看它是如何完成的以及为什么）

SELECT Employee.Name,Employee.Surname,Employee.Position,Manager.Name as ManagerName
FROM Employee
INNER JOIN Stafflink ON Employee.ID=Stafflink.EmpID
INNER JOIN Employee Manager ON Manager.ID=Stafflink.ManID;

我知道问题已在Sql table output 中得到解答

但它似乎不起作用并产生错误：

语法错误（缺少运算符）

任何帮助将不胜感激。

Answer 1

MS Access 对多个 JOINs 有一个非典型要求，即它们被包含在嵌套的 () 组中，例如：

FROM
  ((t1 INNER JOIN t2 ON t1.id = t2.id)
     INNER JOIN t3 ON t2.id = t3.id)

您的FROM 子句应表示为：

SELECT Employee.Name,Employee.Surname,Employee.Position,Manager.Name as ManagerName
FROM ((
  Employee
  INNER JOIN Stafflink ON Employee.ID=Stafflink.EmpID)
  INNER JOIN Employee Manager ON Manager.ID=Stafflink.ManID);