1. Lecture 03 Entity-Relationship Diagram

2. Chapter Outline

3. Overview of Database Design Process

5. Example COMPANY Database

6. Example COMPANY Database (Contd.)

7. ER Model Concepts

8. Types of Attributes (1)

9. Types of Attributes (2)

10. Example of a composite attribute

11. Entity Types and Key Attributes (1)

12. Entity Types and Key Attributes (2)

13. Displaying an Entity type

14. Entity Type CAR with two keys and a corresponding Entity Set

15. Entity Set

16. Initial Design of Entity Types for the COMPANY Database Schema

17. Initial Design of Entity Types: EMPLOYEE, DEPARTMENT, PROJECT, DEPENDENT

18. Refining the initial design by introducing relationships

19. Relationships and Relationship Types (1)

20. Relationship type vs. relationship set (1)

21. Relationship type vs. relationship set (2)

22. Refining the COMPANY database schema by introducing relationships

23. Discussion on Relationship Types

24. Recursive Relationship Type

25. Weak Entity Types

26. Constraints on Relationships

27. Recursive Relationship Type is: SUPERVISION (participation role names are shown)

28. Attributes of Relationship types

29. Notation for Constraints on Relationships

30. Alternative (min, max) notation for relationship structural constraints:

31. Alternative diagrammatic notation

32. Summary of notation for ER diagrams

33. Extended Entity-Relationship (EER) Model (in next chapter)

34. Chapter Summary