1. Agenda and Resources Agenda Resource
Practice creating entity relationship diagrams
Practice creating relations
Resource
ERD_Introductory_Practice.pptx

2. ERD Practice
Dr. Jean A. Pratt
IS 310

3. 1:M
Person:Phone
A person has one or more phone numbers listed with us.
Each phone number is registered by one person.
Person:Address
A person resides at one address.
An address is a residence for one or more people.
Person:
A person has one or more s listed with us.
Each address is registered by one person.

4. 1:1 Person:Instructor A person can be an instructor.
Each instructor is a person.

5. M:M Ternary Person:Program:Instructor
A person can participate in many programs taught by many instructors.
Each program is attended by many participants and is taught by many instructors.
An instructor teaches one or more programs attended by many people.

6. M:M Recursive Person:Person A person can refer many people.
A person can be referred by many people.