Enhanced Entity-Relationship Model
- Enhanced Entity-Relationship Model
In Computer Science, the Enhanced Entity-Relationship (EER) model is a high-level or conceptual data model incorporating extensions to the original Entity-relationship (ER) model, used in the design of databases.It was developed by a need to reflect more precisely properties and constraints that are found in more complex databases, such as in engineering design and manufacturing (CAD/CAM), telecommunications, complex software systems and Geographic Information Systems (GIS).
The EER Model
The EER Model includes all of the modelling concepts introduced by the ER model. Additionally it includes the concepts of a subclass and superclass, along with the concepts of specialisation and generalization. Furthermore, it introduces the concept of a union type or category, which is used to represent a collection of objects that is the union of objects of different entity types.
=References=
* cite book
last = Elmasri
first = Ramez
coauthors= Shamkant B.Navathe
title = Fundamentals of Database Systems
edition = 5th edition
publisher = Pearson/Addison Wesley
location = Boston
year = 2007
isbn = 978-0-321-36957-4
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