EBK DATABASE SYSTEMS: DESIGN, IMPLEMENT
12th Edition
ISBN: 9781305886841
Author: Morris
Publisher: CENGAGE LEARNING - CONSIGNMENT
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Expert Solution & Answer
Chapter 4, Problem 13RQ
Explanation of Solution
Composite entity:
A composite entity is normally used to convert M: N relationships into 1: M relationships. It is also referred as “bridge entity”, which has a primary key (PK) composed of multiple attributes.
- The PK attributes are inherited from the entities, which it associates to one another.
Usage of composite entity in ERD:
In the Entity Relationship Management (ERM), an M: N relationship is effective at the conceptual level. But when implementing the ERM in a relational
Example:
Consider the entities CLASS and STUDENT with M: N relationship defined by following business rules:
- A student can take several classes...
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Chapter 4 Solutions
EBK DATABASE SYSTEMS: DESIGN, IMPLEMENT
Ch. 4 - Prob. 1RQCh. 4 - What is a strong (or identifying) relationship,...Ch. 4 - Prob. 4RQCh. 4 - Suppose you are working within the framework of...Ch. 4 - Prob. 6RQCh. 4 - Prob. 7RQCh. 4 - Discuss the difference between a composite key and...Ch. 4 - What two courses of action are available to a...Ch. 4 - Prob. 11RQCh. 4 - Discuss two ways in which the 1:M relationship...
Ch. 4 - Prob. 13RQCh. 4 - Prob. 14RQCh. 4 - Briefly, but precisely, explain the difference...Ch. 4 - What are multivalued attributes, and how can they...Ch. 4 - Prob. 17RQCh. 4 - Prob. 18RQCh. 4 - What two attributes must be contained in the...Ch. 4 - Describe precisely the composition of the...Ch. 4 - Prob. 21RQCh. 4 - Prob. 1PCh. 4 - Create a complete ERD in Crows Foot notation that...Ch. 4 - Prob. 4PCh. 4 - Prob. 5PCh. 4 - Prob. 6PCh. 4 - Prob. 7PCh. 4 - Prob. 8PCh. 4 - Prob. 9PCh. 4 - Prob. 10PCh. 4 - Prob. 11C
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