# In Chapter 4, you saw the creation of the Tiny College database design, which reflected such business rules as “a professor may advise many students” and “a professor may chair one department.” Modify the design shown in Figure 4.35 to include these business rules: An employee could be staff, a professor, or an administrator. A professor may also be an administrator. Staff employees have a work-level classification, such as Level I or Level II. Only professors can chair a department. A department is chaired by only one professor. Only professors can serve as the dean of a college. Each of the university’s colleges is served by one dean. A professor can teach many classes. Administrators have a position title. Given that information, create the complete ERD that contains all primary keys, foreign keys, and main attributes.

### Database Systems: Design, Implemen...

13th Edition
Carlos Coronel + 1 other
Publisher: Cengage Learning
ISBN: 9781337627900

Chapter
Section

### Database Systems: Design, Implemen...

13th Edition
Carlos Coronel + 1 other
Publisher: Cengage Learning
ISBN: 9781337627900
Chapter 5, Problem 4P
Textbook Problem
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## In Chapter 4, you saw the creation of the Tiny College database design, which reflected such business rules as “a professor may advise many students” and “a professor may chair one department.” Modify the design shown in Figure 4.35 to include these business rules: An employee could be staff, a professor, or an administrator. A professor may also be an administrator. Staff employees have a work-level classification, such as Level I or Level II. Only professors can chair a department. A department is chaired by only one professor. Only professors can serve as the dean of a college. Each of the university’s colleges is served by one dean. A professor can teach many classes. Administrators have a position title. Given that information, create the complete ERD that contains all primary keys, foreign keys, and main attributes.

### Explanation of Solution

Crow’s Foot ER diagram for Tiny College:

The following data model shows the solution for the given question.

Explanation:

• In the above data model, the “Employee” is the supertype entity of “Staff”, “Admin” and “Professor” subtypes and the primary key of “Employee” entity is “Emp_No”. The primary and foreign key of these subtypes are “Emp_No”. Another foreign key of “Professor” entity is “Dept_Code”.
• The overlapping constraint (o) is used as a category symbol. Here the “Employee” supertype entity has optional subtype entity.
• The “Student” table contains the details of students and every student is get advices from the “Staff” table...

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