3个表格的内部连接不起作用

Question

我有以下数据表格（请查看附件图片）。 image 我试图执行查询使用超过2个表上的内部联接。以下是我的问题，请让我知道我犯的错误。 我正在使用MS-Access。

SELECT Employees.Namee,WeekDay.DayName,Schedule.StartTime,Schedule.Hours FROM Schedule INNER JOIN Employees ON Schedule.Emp_ID = Employees.ID INNER JOIN WeekDay ON Schedule.Weekday = WeekDay.ID; 

Answer 1

当你有多个连接，你需要括号。试试这个

SELECT Employees.Namee,WeekDay.DayName,Schedule.StartTime,Schedule.Hours FROM 
(Schedule INNER JOIN Employees ON Schedule.Emp_ID = Employees.ID) INNER JOIN 
WeekDay ON Schedule.Weekday = WeekDay.ID; 

Answer 2

请尝试以下代码

SELECT e.Namee,w.DayName,s.StartTime,s.Hours 
    FROM Schedule s 
    INNER JOIN Employees e 
    INNER JOIN WeekDay w 
    ON s.Emp_ID = e.ID 
    ON s.Weekday = w.ID;