Let me start by saying I am new to database design. I have been programming for 5 years now but recently felt like it would be of worth to learn about databases and database design. I picked up a few books and am now working my way through them. So without further ado, hear is my first question.

I am currently trying to understand and learn how to use the Entity Relationship Model. One of the books I am reading asks me to conceptualize a basic ERD showing the relationships between a Department, Employee, and Manager. The book offered me up these business rules….

Each department has many employees, but each employee belongs to one department.

Each department is managed by one employee, and each of those managers can manage only one department.

So what I am confused about is if a manager is an employee how do I represent that relatiomship.