You Are Hired To Design A Database For A Fitness Center ✓ Solved

You Are Hired To Design A Database For A Fitness Center As The Fitnes

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, a clerk, or a trainer.

An employee cannot be a trainer and an admin because the trainer is compensated hourly, whereas an admin staff is 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, first name, last name, email, and only one phone number. A customer can join more than one class or use any number of facilities.

A customer may also decide to be trained by at most one personal trainer.

Sample Paper For Above instruction

Introduction

Designing an effective database for a fitness center chain requires a comprehensive understanding of its entities, relationships, and constraints. The goal is to create a schema accommodating multiple branches, facilities, employees, classes, and customers while ensuring data integrity and reflecting real-world operational rules.

Entity-Relationship Diagram (ERD)

The primary entities in this system include Branch, Facility, Employee, Class, Customer, and Personal Trainer. Each has distinct attributes and relationships that model the business rules.

Entities and Attributes

• Branch: primary key (BranchID), address (building number, street, district, city).
• Facility: FacilityID (PK), name, fees, BranchID (FK).
• Employee: EmployeeID (PK), first name, last name, address (building number, street, district, city), employee type (admin, clerk, trainer), and multiple phone numbers.
• Class: ClassID (PK), class name, branch (FK), trainer (FK to Employee, optional).
• Customer: MembershipNumber (PK), first name, last name, email, phone number, branch (FK).
• PersonalTrainer: EmployeeID (PK, FK to Employee), optional attributes related to personal training sessions.

Relationships

• Branch - Facility: one-to-many (one branch has many facilities).
• Branch - Class: one-to-many (one branch offers many classes).
• Employee - Class: zero or one trainer per class, one-to-one or zero-to-zero depending on whether a class has a trainer assigned.
• Customer - Class: many-to-many (a customer can join multiple classes).
• Customer - Facility: many-to-many (a customer can use multiple facilities).
• Employee - PersonalTrainer: specialization/ISA—employees can be trainers with specific personal training sessions.
• Customer - PersonalTrainer: optional one-to-one (a customer may have at most one personal trainer).

Participation and Cardinality Constraints

- Each facility must belong to exactly one branch (participation constraint: total, mandatory). This is guided by the business rule that every facility is part of a branch.

- Each class is led by at most one trainer; a trainer can lead zero or more classes; hence, the optional one-to-many relationship. The optionality reflects that not all classes may have a trainer assigned initially.

- Customers can join many classes and use many facilities, indicating many-to-many relationships. These are modeled with associative entities or join tables with appropriate cardinalities.

- Employees work at exactly one branch (participation is total, mandatory), guiding the design to restrict employees from working elsewhere.

Specialization and Completeness Constraints

- An ISA relationship exists between Employee and PersonalTrainer because only employees with the trainer role (a subtype) can be involved in personal training; this is a total specialization (every trainer employee is a personal trainer, but not all employees are trainers).

- The specialization is complete to ensure that every trainer is an employee with specific attributes associated with personal training.

Schema for Selected Entities and Relationships

The two entities selected are Customer and Class, and the relationships include Customer - Class and Customer - Facility.

For the relationships:

- Customer and Class are connected via a many-to-many relationship, implemented with an associative table 'CustomerClass' with attributes: CustomerMembershipNumber, ClassID.

- The 'CustomerFacility' associative table models which facilities a customer uses, with attributes: CustomerMembershipNumber, FacilityID.

If directly embedding relationships within entity schemas, foreign keys serve to enforce referential integrity where appropriate, and join tables manage many-to-many relationships, especially for classes and facilities engagements.

Conclusion

This database design captures the core operations of a multi-branch fitness center, ensuring adherence to business constraints. It emphasizes the roles of employees, class offerings, facilities, and customers with clear relationships and constraints, enabling effective management and scalability.

References

1. Elmasri, R., & Navathe, S. B. (2016). Fundamentals of Database Systems (7th Edition). Pearson.