Gce Model Questions Vol1 2021 Computer Studies Question 23

Practice objective / multiple choice question 23 from the 2021 Gce Model Questions Vol1 Computer Studies examination.

Gce Model Questions Vol1 2021 Computer Studies Objective / Multiple Choice Medium Difficulty
Question 23 GCE_MODEL_QUESTIONS_VOL1 • 2021 • COMPUTER_STUDIES • objective

Consider the relational schema \(R(A, B, C, D, E)\) with the set of functional dependencies: \(A \rightarrow B\) \(B \rightarrow C\) \(AD \rightarrow E\) \(C \rightarrow D\) (a) List all candidate keys of \(R\). (b) Is the schema in Third Normal Form (3NF)? If not, decompose \(R\) into a set of relations that are in 3NF, showing the attributes of each resulting relation.

Answer Options

A. Candidate keys: AD, AC, AE. In 3NF. 3NF decomposition: R1(A,B), R2(B,C), R3(C,D), R4(A,D,E).
B. Candidate keys: AD, AC, AE. Not in 3NF. 3NF decomposition: R1(A,B), R2(B,C), R3(C,D), R4(A,E).
C. Candidate keys: AD, AB, AE. Not in 3NF. 3NF decomposition: R1(A,B), R2(B,C), R3(C,D), R4(A,D,E).
Correct Answer D. Candidate keys: AD, AC, AE. Not in 3NF. 3NF decomposition: R1(A,B), R2(B,C), R3(C,D), R4(A,D,E).
Correct Answer
D
Correct Option:
Candidate keys: AD, AC, AE. Not in 3NF. 3NF decomposition: R1(A,B), R2(B,C), R3(C,D), R4(A,D,E).

About This Question

This is Gce Model Questions Vol1 2021 Computer Studies Question 23. It is one of the objective questions from the 2021 Gce Model Questions Vol1 Computer Studies examination.

Difficulty level: Medium .

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