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 2.36RQ
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.
Therefore, the “OwnerPhone” is the determinant for this assumption.
Assumption 4:
(PetName, Date) → (Service, Charge)
In the above expression, the last functional dependency assumes a pet is seen at most on one day, and that there is no standard charge for a service.
- The Service and Charge attribute are functionally dependent on the composite (PetName, Date)...
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Modern life has been impacted immensely by computers. Computers have penetrated every aspect of oursociety, either for better or for worse. From supermarket scanners calculating our shopping transactionswhile keeping store inventory; robots that handle highly specialized tasks or even simple human tasks,computers do much more than just computing. But where did all this technology come from and whereis it heading? Does the future look promising or should we worry about computers taking over theworld? Or are they just a necessary evil? Provide three references with your answer.
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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