mysql - 接线表 - 除更换外

Question

我有如下所示的关系:员工和培训， 每个员工都可以参加任何培训，因此这是基本的 M:M 到 1:M M:1 内容。

我有一个组合框来选择员工，我想要两个列表框来列出已完成的培训和可用的培训

类似这样的:

然后有两个按钮，将所选内容从一个列表框移动到另一个列表框，并相应地更改记录。

我已进行查询以列出员工参加的所有培训:

SELECT Training.Name, Training.Trainer, Training.Cost, Training.Type, Training.[Length(Day)]
FROM Training INNER JOIN Participation ON Training.[Training ID] = Participation.Training
WHERE (((Participation.Employee)=[Forms]![Add Training 2]![cboEmp]))
ORDER BY Training.Name;

我在选择所有训练并过滤掉上面 SQL 查询中已选择的训练时遇到问题，简单的 EXCEPT 可以工作，但 ACCESS 不支持它。

这就是我想要的:

SELECT Training.Name, Training.Trainer, Training.Cost, Training.Type, Training.[Length(Day)]
FROM Training
EXCEPT
SELECT Training.Name, Training.Trainer, Training.Cost, Training.Type, Training.[Length(Day)]=
FROM Training INNER JOIN Participation ON Training.[Training ID] = Participation.Training
WHERE (((Participation.Employee)=[Forms]![Add Training 2]![cboEmp]))
ORDER BY Training.Name;

Answer 1

您可以只使用不存在或不在:

SELECT Training.Name, Training.Trainer, Training.Cost, Training.Type, Training.[Length(Day)]
FROM Training
WHERE Training.TrainingId NOT IN (SELECT Participation.Training
                                  FROM Participation 
                                  WHERE Participation.Employee = [Forms]![Add Training 2]![cboEmp]
                                 )
ORDER BY Training.Name;