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Disjointness constraints - PowerPoint PPT Presentation

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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547 views • 35 slides

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

The Enhanced Entity Relationship Diagrams (E-ERDs)

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420 views • 22 slides

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'Disjointness constraints' presentation slideshows

Disjointness constraints - PowerPoint PPT Presentation

Enhanced Entity-Relationship Modeling

The Enhanced Entity Relationship Diagrams (E-ERDs)

The Enhanced Entity Relationship Diagrams (E-ERDs)