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 2.40E
A)
Explanation of Solution
Table of example of students, one who has three siblings and other has two siblings:
| StudentNumber | StudentName | SiblingName | Major |
| 10 | Nick Jones |
B)
Explanation of Solution
Candidate keys in the student relational table:
(StudentNumber,SiblingName) acts as candidate key for the Student Relational as using StudentNumber an...
C)
Explanation of Solution
Functional dependencies in the relation:
- StudentNumber-> (StudentName, Major)
- Here the composite attributes StudentName and Major are functionally dependent on the attribute StudentNumber.
- The attribute StudentNumber determines the composite attribute StudentName and Major...
D)
Explanation of Solution
Well-formed relation:
The relations that do meet the relational design criteria are well-formed relations.
- The relational Student table contains the functional dependencies: StudentNumber-> (StudentName, Major) and (StudentNumber, SiblingName) -> (StudentName, Major)...
E)
Explanation of Solution
4NF:
If in a relation there is no non-trivial multivalued dependency, other than a candidate key, the level of
4NF and set of well-formed relations:
A relational table is not a well formed relation if in the relation some attributes of the tuple are functionally dependent on a part of the composite primary key...
F)
Explanation of Solution
Divide the relation to form a set of well-formed relations:
Step-1: Break the student tuple into two relations: Student and StudentSibling.
Show the relations in each table:
STUDENT (StudentNumber, StudentName, Major) and STUDENT-SIBLING (StudentNumber, SiblingName)
- For StudentSibling relation, show the functional dependencies among relations:
- (StudentNumber, SiblingName) -> (StudentNumber)
Here, the attribute StudentNumber is functionally dependent on the composite attribute (StudentNumber, SiblingName).
The composite attribute (StudentNumber, SiblingName) determines the attribute StudentNumber.
(StudentNumber, SiblingName)->(SiblingName)
Here, the attribute SiblingName is functionally dependent on the composite attribute (StudentNumber, SiblingName).
The composite attribute (StudentNumber, SiblingName) determines the attribute StudentNumber.
Check the candidate keys for StudentSibling relation:
(StudentNumber,SiblingName) acts as a candidate key for the StudentSibling relation...
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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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