'Overlap rule' presentation slideshows

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.

610 views • 35 slides

Chapter 4: The Enhanced ER Model and Business Rules

Chapter 4: The Enhanced ER Model and Business Rules. Modern Database Management 7 th Edition Jeffrey A. Hoffer, Mary B. Prescott, Fred R. McFadden. Objectives. Definition of terms Use of supertype/subtype relationships Use of generalization and specialization techniques

625 views • 34 slides

DATABASE DESIGN AND DEVELOPMENT: A VISUAL APPROACH

314 views • 30 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

764 views • 28 slides

Question 11

Question 11.

83 views • 3 slides