'Partial specialization rule' presentation slideshows

Chapter 4 The Enhanced E-R Model and Business Rules

Chapter 4 The Enhanced E-R Model and Business Rules. Supertypes and Subtypes. Subtype: A subgrouping of the entities in an entity type which has attributes that are distinct from those in other subgroupings.

858 views • 35 slides

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.

554 views • 35 slides

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

Chapter 4: The Enhanced E-R Model and Business Rules. Modern Database Management 6 th Edition Jeffrey A. Hoffer, Mary B. Prescott, Fred R. McFadden. Supertypes and Subtypes.

597 views • 31 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

773 views • 28 slides

317 views • 12 slides