Question

SELECT E1.Name AS Empl, E2.Name AS HeadOfDepartment
FROM EMPLOYEE AS E1 INNER JOIN DEPARTMENT AS Dep
ON E1.DepartmentNr=Dep.DepartmentNr 
INNER JOIN EMPLOYEE AS E2 
ON Dep.Head=E2.EmployeeNr
ORDER BY Dep.Name;

我不知道错误在哪里。

Answer 1

尝试以下查询。

SELECT E1.Name AS Empl, E2.Name AS HeadOfDepartment
FROM EMPLOYEE AS E1 INNER JOIN DEPARTMENT AS Dep
ON E1.DepartmentNr=Dep.DepartmentNr 
INNER JOIN E1 ON Dep.Head = E1.EmployeeNr
ORDER BY Dep.Name;

Answer 2

Access数据库有一种奇怪的语法。您的SQL语句应该适用于大多数服务器类型数据库。无论如何，请尝试下面的代码，看看它是否适用于您的访问。

SELECT E1.Name AS Empl,
       E2.Name AS HeadOfDepartment
FROM EMPLOYEE AS E1
INNER JOIN (DEPARTMENT AS Dep
INNER JOIN EMPLOYEE AS E2 
ON Dep.Head=E2.EmployeeNr)
ON E1.DepartmentNr=Dep.DepartmentNr
ORDER BY Dep.Name;

两次内连接。但总是存在语法错误

2 个答案: