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Logical database design and the relational model(database)
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McGraw-Hill/Irwin Copyright © 2007 by The McGraw-Hill Companies, Inc. All rights reserved. Chapter 12 View Design and Integration
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Chapter 5 1 © Prentice Hall, 2002 Chapter 5: Transforming EER Diagrams into Relations Mapping Regular Entities to Relations 1. Simple attributes: E-R attributes
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--The Entity Relationship Model(4)--1 Outline ER model Overview Entity types Attributes, keys Relationship types Weak entity types uses Integration
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Keys are special fields that serve two main purposes: ◦ Primary keys are unique identifiers of the relation in question. Examples include employee numbers,
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