1. Information System & Database Design
CS105

2. What is Information System
Data
raw facts
Information
Data that has been organized to help us answer question
Information System
Software that helps us organize and analyze data

3. Information System vs. Website Directory
Tables (in most database system)
Website Directory
Hierarchy Structure (Tree)
Class
CS105
Computer Concept
M-2-135
Students
Student
Henry
UMS
Dan
UMS …
class
enroll
student

4. Tables Fields / Attribute (each column) Records (each row)
Key (unique identification)
cno
Data
cname, cr
Records (each row)
7 records
Courses

5. Entity- Relationship (ER) Model
Database Schema
ER Modeling / Diagram (1)
An instructor is advising one or more students
Students - stno - name - addr - city - state - zip
Instructors - empno - name - rank - roomno - telno
advising

6. Entity- Relationship (ER) Model
ER Modeling / Diagram (2)
stno
name
name
addr
empno
Students
advising
Instructors
city
state
rank
roomno
zip
telno

7. Example in Textbook: Movie Rental
Entity
Movie
MovieId, Title, Genre, Rating
Customer
CustomerId, Name, Address, CreditCardNumber
Relationship
Rents
CustomerId, MovieId, DataRented, DateDue

8. Course DB Entity Relationships Students Courses Instructors Advising
Grades

9. What you need to do Find your partner(s)
You should draw an ER diagram with
2 Tables for Entities
1 Table for Relationship
All tables should contain
at least 1 key and 3 data fields.
You should have a short description
Turn in the diagram with your signatures after class.