## it403 assignment2

 The clinic has several dentists. Each dentist has a unique Number, name, nationality, multiple room-number, salary, birth-date and home-address (Box, City, Zip). Each client (patient) has a unique Code, name, home-phone, work-phone, address, and birth-date. Each client is assigned to one dentist. All future visits will be to the same dentist. A client can be insured or self-paying. An insured client should have an insurance company-name, and company-Phone, while a self-paying client must have a bank-name and a bank account. Each visit of a client is described by a date, type, action, fee, and date-of-next-appointment.

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.

1. Design an Entity Relationship (ER) Model to represent the above requirements.  (2 Marks)
2. Convert the ER Diagram that presented in part-1 to Rational Schema. (2 Marks)
 1 Mark
 Learning Outcome(s):   Explain the concepts and architectures involved in database development.

# Question Two

Explain and distinct between disjoint and overlapping constraints.         (0.5 Mark)

 1.5 Mark
 Learning Outcome(s): CLO3 Create Entity-Relationship model, Relational model, and write SQL queries.

# 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)

 1.5 Marks
 Learning Outcome(s): CLO3 Create Entity-Relationship model, Relational model, and write SQL queries.

# Question Four

In SEU, identify Cardinality ratios between the following entities:

Entity 1                      Cardinality Ratio                           Entity 2

CLASSROOM                 ______________                            PODIUM

STUDENT                       ______________                            CLASS

INSTRUCTOR                ______________                            TECHNICAL STAFF

ROOM                             ______________                            BRANCH

STUDENT                       ______________                            TEACHER

INSTRUCTOR                ______________                             DEAN