A subtype is a sub-grouping of the entities in an entity type that is meaningful to the organization and that shares common attributes or relationships distinct from other subgroups. What is an overlapping subtype? Describe and provide an example. What is a disjoint subtype? Describe and provide an example. Explain the difference between partial completeness and total completeness?
A subtype is a sub-grouping of the entities in an entity type that is meaningful to the organization and that shares common attributes or relationships distinct from other subgroups. What is an overlapping subtype? Describe and provide an example. What is a disjoint subtype? Describe and provide an example. Explain the difference between partial completeness and total completeness?
Database Systems: Design, Implementation, & Management
12th Edition
ISBN:9781305627482
Author:Carlos Coronel, Steven Morris
Publisher:Carlos Coronel, Steven Morris
Chapter4: Entity Relationship (er) Modeling
Section: Chapter Questions
Problem 1RQ
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A subtype is a sub-grouping of the entities in an entity type that is meaningful to the organization and that shares common attributes or relationships distinct from other subgroups.
What is an overlapping subtype? Describe and provide an example.
What is a disjoint subtype? Describe and provide an example.
Explain the difference between partial completeness and total completeness?
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