Completeness constraint - PowerPoint PPT Presentation

Database

Database . EER. Extended E-R Model. E-R model is sufficient for traditional database applications Nontraditional applications (CAD, multimedia) have more complex requirements Can extend traditional E-R diagrams with semantic data modeling concepts. Inheritance. EER IsA Notation. Phone.

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Enhanced Entity-Relationship Modeling

Enhanced Entity-Relationship Modeling. Strong and Weak Entity Types. Strong entity: Each object is uniquely identifiable using primary key of that entity type. Weak entity: Each object cannot be uniquely identified using only the attributes associated with that entity type.

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596 views • 35 slides

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