When mapping generalisations and specialisations in enhanced entity relationship diagrams, which solution will deliver the least redundancy and allow representation of the most specialisation types. Select one: a. Multiple relations representing subclass entities only. b. A single relation containing a type attribute. c. Multiple relations representing both superclass and subclass entities. d. A single relation with multiple boolean type attributes
When mapping generalisations and specialisations in enhanced entity relationship diagrams, which solution will deliver the least redundancy and allow representation of the most specialisation types. Select one: a. Multiple relations representing subclass entities only. b. A single relation containing a type attribute. c. Multiple relations representing both superclass and subclass entities. d. A single relation with multiple boolean type attributes
Principles of Information Systems (MindTap Course List)
12th Edition
ISBN:9781285867168
Author:Ralph Stair, George Reynolds
Publisher:Ralph Stair, George Reynolds
Chapter5: Database Systems And Applications
Section: Chapter Questions
Problem 4PSE: Using a graphics program, develop an entity-relationship diagram for a database application for an...
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When mapping generalisations and specialisations in enhanced entity relationship diagrams, which solution will deliver the least redundancy and allow representation of the most specialisation types.
Select one:
a.
Multiple relations representing subclass entities only.
b.
A single relation containing a type attribute.
c.
Multiple relations representing both superclass and subclass entities.
d.
A single relation with multiple boolean type attributes.
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