Database Concepts (7th Edition)
7th Edition
ISBN: 9780133544626
Author: David M. Kroenke, David J. Auer
Publisher: PEARSON
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Expert Solution & Answer
Chapter 2, Problem 2.33RQ
Explanation of Solution
Determinant in following relation:
Assumption 1:
PetName → (PetType, PetBreed, PetDOB, OwnerLastName, OwnerFirstName, OwnerPhone, OwnerEmail)
In the above expression, PetName attribute determines PetType, PetBreed, PetDOB, OwnerLastName, OwnerFirstName, OwnerPhone, and OwnerEmail attributes, left term “PetName” refers the determinant, and “→” defines the relationship.
- That is, the PetType, PetBreed, PetDOB, OwnerLastName, OwnerFirstName, OwnerPhone, and OwnerEmail are functionally dependent on PetName.
Therefore, the “PetName” is the determinant for this assumption.
Assumption 2:
OwnerEmail → (OwnerLastName, OwnerFirstName, OwnerPhone)
In the above expression, OwnerEmail attribute determines OwnerLastName, OwnerFirstName, and OwnerPhone attributes, left term “OwnerEmail” refers the determinant, and “→” defines the relationship.
- That is, the OwnerLastName, OwnerFirstName, and OwnerPhone are functionally dependent on OwnerEmail.
Therefore, the “OwnerEmail” is the determinant for this assumption.
Assumption 3:
OwnerPhone → (OwnerLastName, OwnerFirstName, OwnerEmail)
In the above expression, OwnerPhone attribute determines OwnerLastName, OwnerFirstName, and OwnerEmail attributes, “OwnerPhone” refers the determinant, and “→” defines the relationship.
- That is, the OwnerLastName, OwnerFirstName, and OwnerEmail are functionally dependent on OwnerPhone...
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Students have asked these similar questions
The model above needs some improvement. Where you can apply all the normalization rules to attributes. Furthermore, you also need to explain entities and relations between them, and the purpose of attributes by showing why and how they exist ?.
Using the assumptions you stated in your answer to question 2.32, what are the determinants of this relation? What attribute(s) can be the primary key of this relation?
It is possible to construct a connection such as sec course from a group of relationships that are many to one. Does the relation's many-to-one cardinality restriction get enforced by the main and foreign key constraints? Why do you think that is?
Chapter 2 Solutions
Database Concepts (7th Edition)
Ch. 2 - Prob. 2.1RQCh. 2 - Define the term entity, and give an example of an...Ch. 2 - Prob. 2.3RQCh. 2 - Prob. 2.4RQCh. 2 - Prob. 2.5RQCh. 2 - Prob. 2.6RQCh. 2 - Prob. 2.7RQCh. 2 - Prob. 2.8RQCh. 2 - Prob. 2.9RQCh. 2 - Define the term unique key and give an example.
Ch. 2 - Prob. 2.11RQCh. 2 - Prob. 2.12RQCh. 2 - Prob. 2.13RQCh. 2 - Describe four uses of a primary key.Ch. 2 - Prob. 2.15RQCh. 2 - Prob. 2.16RQCh. 2 - Prob. 2.17RQCh. 2 - Explain the term foreign key, and give an example.Ch. 2 - Prob. 2.19RQCh. 2 - Prob. 2.20RQCh. 2 - Explain three possible interpretations of a null...Ch. 2 - Give an example of a null value (other than one...Ch. 2 - Prob. 2.23RQCh. 2 - Prob. 2.24RQCh. 2 - Prob. 2.25RQCh. 2 - Prob. 2.26RQCh. 2 - Prob. 2.27RQCh. 2 - Define the term primary key in terms of functional...Ch. 2 - Prob. 2.31RQCh. 2 - Examine the data in the Veterinary Office...Ch. 2 - Prob. 2.33RQCh. 2 - Describe a modification problem that occurs when...Ch. 2 - Prob. 2.35RQCh. 2 - Prob. 2.36RQCh. 2 - Prob. 2.37RQCh. 2 - Apply the normalization process to the Veterinary...Ch. 2 - Prob. 2.39ECh. 2 - Prob. 2.40E
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Similar questions
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