
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
EBK DATABASE CONCEPTS
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