Question One
Design an ER diagram for the following Dental Clinic database. Your diagram should have all the needed details. You may make any reasonable assumptions but you have to state them clearly.
Design an Entity Relationship (ER) Model to represent the above requirements. (2 Marks)
Convert the ER Diagram that presented in part-1 to Rational Schema. (2 Marks)
Question Two
Explain and distinct between disjoint and overlapping constraints. (0.5 Mark)
Illustrate your answer with suitable examples for each constraint. (0.5 Mark)
Question Three
Define Cardinality Ratios for binary relationship? What are possible Cardinality Ratios for Binary Relationship? Suppose in SEU, there are some departments consist of many employees. ( 1 Mark)
What is the cardinality ratio for DEPARTMENT:EMPLOYEE? (0.5 Marks)
Question Four
In SEU, identify Cardinality ratios between the following entities:
