DATABASE SYSTEMS
13th Edition
ISBN: 9780357095607
Author: Coronel
Publisher: CENGAGE L
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Chapter 4, Problem 17RQ
Explanation of Solution
Cardinality:
Connecting lines among the entities will illustrate the relationships of entities in the ER diagram.
- “Cardinality” states that how many occurrences of an entity relate to one occurrence of other entity.
Crow’s Foot symbols and its cardinality:
The following table illustrates the different connectivity and participation combinations which are maintained by the Crow’s Foot notation:
| Notation | Cardinality | Description |
| (0,N) | Zero or more instances | |
| (1,N) | One or more instances | |
| (1,1) | One instance | |
| (0,1) | Zero or one instance |
Cardinalities for given ERD:
The following figure illustrates the cardinalities for each relationship in given ER diagram:
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Chapter 4 Solutions
DATABASE SYSTEMS
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 - What is a derived attribute? Give an example. What...Ch. 4 - Prob. 11RQ
Ch. 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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