In the example above, if Employees are only in one Department and suddenly you have the situation where an employee is in more than one department, you don't n

In the example above, if Employees are only in one Department and suddenly you have the situation where an employee is in more than one department, you don't need to create a link table to model that. In other words, you don't need to think, "Is this a one-to-one, one-to-many, or many-to-many relationship?" before you start, it can just emerge as you go.