CPIS 340 KAU Database Management Systems for A Fitness Center ERD Paper
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CPIS 340: Database Management Systems
Assignment 1 –
You are hired to design a database for a fitness center. As the fitness center is expanding with
more than one branch, they want to create a database to keep track of its customers, facilities and
employees. Each branch has a unique id and address (building number, street, district, and city).
A branch may have more than one facility (e.g. swimming pool, spa, etc.). Each facility must
belong to only one branch, and the information for a facility is name and fees. In addition, each
fitness branch offers different classes (such as Yoga, Pilates, Zumba, etc.). All classes should be
led by at most one trainer, who is an employee.
Employees must work at one and only one branch. Each employee has an id, name, address
(building number, street, district, and city) and can have multiple phone numbers. An employee
can only be an admin, managing the facility or working as a clerk, or a trainer. An employee
cannot be a trainer and an admin because the trainer id compensated an hourly wage while an
admin staff paid a monthly salary. Trainers can train individual customers at different time
sessions.
A customer must register at one branch. Each customer has a membership number, name (stored
as first name and last name), email, and only one phone number. A customer can join more than
one class or uses any number of facilities. A customer may also decide to be trained by at most
one personal trainer.
Given the above description:
1. Draw an ERD for the database, identifying the following:
a.All the entities, attributes and relationships
b.Primary key and (discriminator in weak entity, if any). Don’t forget each
entity has to have PK.
c.Participation and cardinality constraints. (Explain your choices for two
constraints- i.e. identify the words the guided your decision)
d.Specialization and completeness constraints (if there is an ISA relationship).
2. Write a schema for two entities and two relationships of your choice. Remember,
sometimes a relationship is better not be represented in a separate schema; if this is
the case with your chosen relationship explain what you will do.
Please use a tool to draw the ERD. There are many tools out there; some students suggested:
https://erdplus.com/
This assignment worth 10% of your overall grade.
