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Information System & Database Design
CS105
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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
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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
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Tables Fields / Attribute (each column) Records (each row)
Key (unique identification) cno Data cname, cr Records (each row) 7 records Courses
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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
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Entity- Relationship (ER) Model
ER Modeling / Diagram (2) stno name name addr empno Students advising Instructors city state rank roomno zip telno
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Example in Textbook: Movie Rental
Entity Movie MovieId, Title, Genre, Rating Customer CustomerId, Name, Address, CreditCardNumber Relationship Rents CustomerId, MovieId, DataRented, DateDue
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Course DB Entity Relationships Students Courses Instructors Advising
Grades
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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.
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