Database Systems: Design, Implementation, & Management
Database Systems: Design, Implementation, & Management
11th Edition
ISBN: 9781285196145
Author: Steven, Steven Morris, Carlos Coronel, Carlos, Coronel, Carlos; Morris, Carlos Coronel and Steven Morris, Carlos Coronel; Steven Morris, Steven Morris; Carlos Coronel
Publisher: Cengage Learning
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Chapter 5, Problem 4P

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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