Chapter 4:  The Enhanced E-R Model  and Business Rules Preloader

Chapter 4: The Enhanced E-R Model and Business Rules - PowerPoint PPT Presentation


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Supertypes and Subtypes. One of the major challenges in data modeling is to recognize and clearly represent entities that are almost the same; that is, entity types that share common properties but also have one or more distinct properties that are of interest to the organization.\"SupertypeSubtyp

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