1. Database Processing: David M. Kroenke’s Chapter Five:
Fundamentals, Design, and Implementation
Chapter Five:
Data Modeling with the
Entity-Relationship Model
Part Two
DAVID M. KROENKE’S DATABASE PROCESSING, 10th Edition
© 2006 Pearson Prentice Hall, Modified by Dr. Lyn Mathis

2. Strong Entity Patterns: 1:1 Strong Entity Relationships
DAVID M. KROENKE’S DATABASE PROCESSING, 10th Edition
© 2006 Pearson Prentice Hall, Modified by Dr. Lyn Mathis

3. Strong Entity Patterns: 1:1 Strong Entity Relationships
DAVID M. KROENKE’S DATABASE PROCESSING, 10th Edition
© 2006 Pearson Prentice Hall, Modified by Dr. Lyn Mathis

4. Identifying Strong Entities
Has it’s own identifier
Can exist, logically, without another entity
Forget the database implementation
DAVID M. KROENKE’S DATABASE PROCESSING, 10th Edition
© 2006 Pearson Prentice Hall, Modified by Dr. Lyn Mathis

5. ERwin Symbol Summary
DAVID M. KROENKE’S DATABASE PROCESSING, 10th Edition
© 2006 Pearson Prentice Hall, Modified by Dr. Lyn Mathis

6. Strong Entity Patterns: 1:N Strong Entity Relationships
DAVID M. KROENKE’S DATABASE PROCESSING, 10th Edition
© 2006 Pearson Prentice Hall, Modified by Dr. Lyn Mathis

7. Strong Entity Patterns: 1:N Strong Entity Relationships
DAVID M. KROENKE’S DATABASE PROCESSING, 10th Edition
© 2006 Pearson Prentice Hall, Modified by Dr. Lyn Mathis

8. Strong Entity Patterns: N:M Strong Entity Relationships
DAVID M. KROENKE’S DATABASE PROCESSING, 10th Edition
© 2006 Pearson Prentice Hall, Modified by Dr. Lyn Mathis

9. Strong Entity Patterns: N:M Strong Entity Relationships
DAVID M. KROENKE’S DATABASE PROCESSING, 10th Edition
© 2006 Pearson Prentice Hall, Modified by Dr. Lyn Mathis

10. Strong Entity Patterns: N:M Strong Entity Relationships
DAVID M. KROENKE’S DATABASE PROCESSING, 10th Edition
© 2006 Pearson Prentice Hall, Modified by Dr. Lyn Mathis

11. ID-Dependent Relationships: Three Principle Patterns
Association (confused with M:N)
Multivalued Attribute
Version/instance
DAVID M. KROENKE’S DATABASE PROCESSING, 10th Edition
© 2006 Pearson Prentice Hall, Modified by Dr. Lyn Mathis

12. ID-Dependent Relationships: The Association Pattern
Note the Price column, which has been added.
DAVID M. KROENKE’S DATABASE PROCESSING, 10th Edition
© 2006 Pearson Prentice Hall, Modified by Dr. Lyn Mathis

13. ID-Dependent Relationships: The Association Pattern
DAVID M. KROENKE’S DATABASE PROCESSING, 10th Edition
© 2006 Pearson Prentice Hall, Modified by Dr. Lyn Mathis

14. ID-Dependent Relationships: The Association Pattern
Why confused with M:N?
ERwin
DAVID M. KROENKE’S DATABASE PROCESSING, 10th Edition
© 2006 Pearson Prentice Hall, Modified by Dr. Lyn Mathis

15. ID-Dependent Relationships: The Multivaled Attribute Pattern
DAVID M. KROENKE’S DATABASE PROCESSING, 10th Edition
© 2006 Pearson Prentice Hall, Modified by Dr. Lyn Mathis

16. ID-Dependent Relationships: The Multivaled Attribute Pattern
DAVID M. KROENKE’S DATABASE PROCESSING, 10th Edition
© 2006 Pearson Prentice Hall, Modified by Dr. Lyn Mathis

17. ID-Dependent Relationships: The Multivaled Attribute Pattern
DAVID M. KROENKE’S DATABASE PROCESSING, 10th Edition
© 2006 Pearson Prentice Hall, Modified by Dr. Lyn Mathis

18. ID-Dependent Relationships: The Multivaled Attribute Pattern
DAVID M. KROENKE’S DATABASE PROCESSING, 10th Edition
© 2006 Pearson Prentice Hall, Modified by Dr. Lyn Mathis

19. ID-Dependent Relationships: The Archtype/Instance Pattern
Abstract or logical parent
Child , the physical manifestation of parent
Example
CLASS (logical parent)
SECTION (instance of parent)
DAVID M. KROENKE’S DATABASE PROCESSING, 10th Edition
© 2006 Pearson Prentice Hall, Modified by Dr. Lyn Mathis

20. ID-Dependent Relationships: The Archtype/Instance Pattern
Note that these are true ID-dependent relationships - the identifier of the parent appears as part of the composite identifier of the ID-dependent child.
DAVID M. KROENKE’S DATABASE PROCESSING, 10th Edition
© 2006 Pearson Prentice Hall, Modified by Dr. Lyn Mathis

21. No Longer ID-Dependent Children: Rather Weak Children
Note the use of weak, but not ID-dependent children.
DAVID M. KROENKE’S DATABASE PROCESSING, 10th Edition
© 2006 Pearson Prentice Hall, Modified by Dr. Lyn Mathis

22. Non-ID-Dependent Weak Entities: How Important?
Logical Necessity?
Business Rule Only?
Erwin?
This class?
Back to Strong Entity Patterns
DAVID M. KROENKE’S DATABASE PROCESSING, 10th Edition
© 2006 Pearson Prentice Hall, Modified by Dr. Lyn Mathis

23. Learning About Databases: The Problem
1:M Relationships
Strong Entities
Weak Entities
ID-Dependent Entities
DAVID M. KROENKE’S DATABASE PROCESSING, 10th Edition
© 2006 Pearson Prentice Hall, Modified by Dr. Lyn Mathis

24. Mixed Patterns: The Line-Item Pattern
DAVID M. KROENKE’S DATABASE PROCESSING, 10th Edition
© 2006 Pearson Prentice Hall, Modified by Dr. Lyn Mathis

25. Mixed Patterns: The Line-Item Pattern
DAVID M. KROENKE’S DATABASE PROCESSING, 10th Edition
© 2006 Pearson Prentice Hall, Modified by Dr. Lyn Mathis

26. David M. Kroenke’s Database Processing Fundamentals, Design, and Implementation (10th Edition)
End of Presentation:
Chapter Five Part Two
DAVID M. KROENKE’S DATABASE PROCESSING, 10th Edition
© 2006 Pearson Prentice Hall, Modified by Dr. Lyn Mathis