Neco 2022 Computer Studies Question 43

Practice objective / multiple choice question 43 from the 2022 Neco Computer Studies examination.

Neco 2022 Computer Studies Objective / Multiple Choice Hard Difficulty
Question 43 NECO • 2022 • COMPUTER_STUDIES • objective

Consider relation \(R(A,B,C,D)\) with functional dependencies \(A\rightarrow B\), \(BC\rightarrow D\), and \(D\rightarrow A\). Identify all candidate keys, then decompose \(R\) into BCNF relations and state how many tables result from the decomposition.

Answer Options

A. Candidate keys: AB and CD; BCNF decomposition results in 2 tables (A,B) and (C,D)
B. Candidate keys: AC only; BCNF decomposition results in 3 tables (A,B), (B,D) and (C,D)
Correct Answer C. Candidate keys: AC and BC; BCNF decomposition results in 3 tables (A,B), (D,A) and (D,C)
D. Candidate keys: AD and BD; BCNF decomposition results in 4 tables (A,B), (B,C), (C,D) and (D,A)
Correct Answer
C
Correct Option:
Candidate keys: AC and BC; BCNF decomposition results in 3 tables (A,B), (D,A) and (D,C)

About This Question

This is Neco 2022 Computer Studies Question 43. It is one of the objective questions from the 2022 Neco Computer Studies examination.

Difficulty level: Hard .

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