1. Super Entity & Sub Entity
Yong Choi
School of Business
CSU, Bakersfield

2. Structure of Super & Sub Entity 1

3. Example of Super & Sub Entity 1

4. Structure of Super & Sub Entity 2

5. Example of Super & Sub Entity 1

6. Simple Example of E-ERD

7. Generalization (bottom-up strategy)
Start with candidate
sub entities

8. Generalization (top-down Strategy)
Start with candidate
Super entity

9. Specialization and Rule
Total Specialization
Partial Specilization
Rule
Disjoint Rule
Overlap Rule

10. Total Specialization
Only two choices with changes: Outpatient to Resident patient or vice versa.

11. Partial Specialization
That is, it cannot be something else (like a motor cycle).

12. Disjoint Rule

13. Overlap Rule