Which constructs in a Presentation-Layer ER diagram cannot be directly mapped to a logical schema? What is

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Which constructs in a Presentation-Layer ER diagram cannot be directly mapped to a logical schema? What is required to represent these constructs in a Design-Specific ER diagram?
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Data Modeling and Database Design

ISBN: 978-1285085258

2nd edition

Authors: Narayan S. Umanath, Richard W. Scammel

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