The Enhanced Entity- Relationship (EER) Model
Chapter 8
The Enhanced Entity-
Relationship (EER) Model
Copyright ? 2011 Pearson Education, Inc. Publishing as Pearson Addison-Wesley
Chapter 8 Outline
Subclasses, Superclasses, and Inheritance Specialization and Generalization Constraints and Characteristics of
Specialization and Generalization Hierarchies Modeling of UNION Types Using Categories
Copyright ? 2011 Ramez Elmasri and Shamkant Navathe
Chapter 8 Outline (cont'd.)
A Sample UNIVERSITY EER Schema, Design Choices, and Formal Definitions
Example of Other Notation: Representing Specialization and Generalization in UML Class Diagrams
Data Abstraction, Knowledge Representation, and Ontology Concepts
Copyright ? 2011 Ramez Elmasri and Shamkant Navathe
The Enhanced EntityRelationship (EER) Model
Enhanced ER (EER) model
Created to design more accurate database schemas
? Reflect the data properties and constraints more precisely
More complex requirements than traditional applications
Copyright ? 2011 Ramez Elmasri and Shamkant Navathe
Subclasses, Superclasses, and Inheritance
EER model includes all modeling concepts of the ER model
In addition, EER includes:
Subclasses and superclasses Specialization and generalization Category or union type Attribute and relationship inheritance
Copyright ? 2011 Ramez Elmasri and Shamkant Navathe
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