Enhanced Entity Relationship Diagrams. (EERD). Sub Type and Super Type Relationships

1. Advance Database Systems
Enhanced Entity Relationship Diagrams (EERD)

2. Contents
• Enhanced Entity Relationship Diagrams (EERD)
• Sub Type and Super Type Relationships

3. Enhanced Entity Relationship Diagrams (EERD)

4. Sub Type and Super Type Relationships

5. Basic Concept and Notation

11. Attribute Inheritance

12. When to use Supertype/Subtype Relationships

14. Representing Specialization and Generalization

17. Specialization

20. Specifying Constraint in Sub Type/Super Type
Relationships

21. Total Specialization/Partial Specialization Rule

23. Specifying Disjointness Constraints

24. Disjoint Rule/Overlap Rule

26. Defining Subtype Discriminators

28. Disjoint Subtype

30. Defining Super Type/Sub Type Hierarchies