What are the main reasons for introducing the concepts of super classes and subclasses into an ER

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What are the main reasons for introducing the concepts of super classes and subclasses into an ER model?

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Database Systems A Practical Approach to Design Implementation and Management

ISBN: 978-0132943260

6th Edition Global

Authors: Thomas Connolly, Carolyn Begg

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Question Posted: Dec 17, 2015 05:26 AM

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What are the main reasons for introducing the concepts of super classes and subclasses into an ER

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Database Systems A Practical Approach to Design Implementation and Management

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