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The Enhanced Entity- Relationship (EER) Model

Copyright 2011 Pearson Education, Inc. Publishing as Pearson Addison-Wesley Chapter 8 The Enhanced Entity- Relationship (EER) Model Copyright 2011 Ramez Elmasri and Shamkant Navathe 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

Terms for relationship between a superclass and any one of its subclasses Superclass/subclass Supertype/subtype Class/subclass relationship Type inheritance Subclass entity inherits all attributes and relationships of superclass

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