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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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