Tiny College wants to keep track of the history of all administrative appointments (date of appointment and date of termination). (Hint: Time variant data are at work.) The Tiny College chancellor may want to know how many deans worked in the College of Business between January 1, 1960 and January 1, 2010 or who the dean of the College of Education was in 1990.
Given that information, create the complete ERD containing all primary keys, foreign keys, and main attributes.
Here are the three entities referenced in the problem; the employee, the school and the professor. The professor is assigned to a school and as an employee, a professor is one of three employee types. A professor could also hold a staff or admin position as well as being a professor.
The professor/school relationship where a professor could be a school dean are the entities for which current data is kept.