Chapter 5 - DataBase

Chapter 5 - DataBase

1. Data Model

2. Apreaches of data Modeling

   • ERD
   • SOD
   • RT
     • Inside out

3. ER Model

   • Peter Chen (1976) not a standard

4. Patterns

5. Entity vs Entity Class vs Entity Instance

   • Entity = Entity Class
   • class = collection of objectcs which user car identify and track
     • ex: Student
   • Entity:
   • Attribute
     • Something that describes the entity
       • something to have a diff value. Like hair color