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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 Shamkant Navathe The Enhanced Ent

Abstraction process Classes and objects are made uniquely identifiable by means of some identifier Needed at two levels To distinguish among database objects and classes To identify database objects and to relate them to their real-world counterparts

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  Process, Abstraction, Abstraction process

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