Lab 07 – Entity Relationship Diagrams
(Database Design ERDs) Objective:
• Students work with a simple scenario to find the entities and the relationship between entities.
• Students learn to define the relationship cardinality and optionality.
• Students learn to design a simple database using an ERD model.
• Students learn ow to fix many-to-many relationships in an ERD.
Submission:
ONLY ONE SUBMISSION PER PARTNERSHIP PLEASE Tasks:
Draw the corresponding crow’s foot ERD for the following scenario. M:N relationships should be broken into two 1:M relationships using a bridge entity. Label PK attributes and FK when applicable.
Bridge/Junction Entity: The bridge/junction entity is used to eliminate the many-to-many relationships. This entity sits between the two entities with the many to many relationships and this composite entity shares the primary keys from both tables.
Show all PK’s and FK’s with your solution.
First you need to find all entities. Next, list the attributes for each entity. Next, you need to find the relationship between each two entities if there is any relationship. Fix all manyto-many relationships. Finally, make sure all PKs and FKs are properly defined.
DBS211
For all entities, list their attributes. For example, for the students, we need to store student ID, student name and last name, email address, address, and phone number. You do not need to define all possible attributes. Just determine some important attributes. For each entity, you need to define a primary key. If there is a relationship between two entities make sure you define the corresponding foreign key in the child table.
• Each department has many programs, but every program belongs to only one department.
• Every department has many professors.
• A professor can work for only one department.
• A program has many courses.
• A course can be a requirement of many programs.
• A professor can teach many courses. A course can also be taught with many professors, via sections.
• Each section is only taught by one professor (ignore the summer term)
• A program has many students studying in that program.
• A student can study multiple programs. However, a student has to register in least in one program.
• A course can be taken by many students.
