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The Enhanced Entity Relationship Diagrams (E-ERDs)

The Enhanced Entity Relationship Diagrams (E-ERDs). Supertypes and Subtypes. Subtype: A subgrouping of the entities in an entity type that has attributes distinct from those in other subgroupings Supertype: A generic entity type that has a relationship with one or more subtypes

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772 views • 28 slides

Database Management System

College Of Science & Technology- Khan younis Information Technology & Computer Science Dep. Database Management System . Part 3 The Enhanced ER Model and Business Rules. Prepared by Dr. Ahmed El-Ragal. Reviewed & Presented By Mr. Mahmoud Rafeek Alfarra . Supertypes and Subtypes.

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431 views • 24 slides

MBA 664 Database Management

MBA 664 Database Management. Dave Salisbury salisbury@udayton.edu (email) http://www.davesalisbury.com/ (web site). Evolution of the E-R Model. Basic E-R Model nearly 25 years old complex data relationships and new database technology have outgrown it in some respects Enhanced E-R Model

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514 views • 19 slides

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'Total specialization rule' diaporamas de présentation

Total specialization rule - PowerPoint PPT Presentation

The Enhanced Entity Relationship Diagrams (E-ERDs)

Database Management System

MBA 664 Database Management