In the context of EER data modeling, one can represent entities using superclasses and subclasses. Using your own model, explain why one would want to introduce the concepts of superclasses and subclasses into an EER model? I. Describe and illustrate using the model in question (I) the process of attribute inheritance. П. With the model in question (I) describe and contrast the process of specialization with the process of generalization. III.

In the context of EER data modeling, one can represent entities using superclasses and subclasses. Using your own model, explain why one would want to introduce the concepts of superclasses and subclasses into an EER model? I. Describe and illustrate using the model in question (I) the process of attribute inheritance. П. With the model in question (I) describe and contrast the process of specialization with the process of generalization. III.

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Concept explainers

Enhanced ER Model

The enhanced ER model is an abbreviation for Enhanced Entity-Relationship (EER) model. As you know, the entity-relationship (ER) model is a pictorial illustration of the relationship between various entities of a domain. In the case of a large amount of data with multiple interrelated entities, the ER diagrams become complex and tough to interpret. For such cases, the need for enhancement in the ER model was observed, and thus, the EER model was designed.

Question

In the context of EER data modeling, one can represent entities using superclasses and
subclasses.
Using your own model, explain why one would want to introduce the concepts of
superclasses and subclasses into an EER model?
I.
II.
Describe and illustrate using the model in question (I) the process of attribute
inheritance.
With the model in question (I) describe and contrast the process of specialization with
the process of generalization.
III.
IV.
Modify the model to describe the two main constraints that apply to a
specialization/generalization relationship.

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