Gce Model Questions Vol1 2023 Computer Studies Question 46

Practice objective / multiple choice question 46 from the 2023 Gce Model Questions Vol1 Computer Studies examination.

Gce Model Questions Vol1 2023 Computer Studies Objective / Multiple Choice Hard Difficulty
Question 46 GCE_MODEL_QUESTIONS_VOL1 • 2023 • COMPUTER_STUDIES • objective

Given relation \(R(A,B,C,D,E)\) with functional dependencies: \(A\rightarrow B\), \(BC\rightarrow D\), \(D\rightarrow E\), \(A\rightarrow C\). (a) Find a minimal cover of the dependencies. (b) Decompose \(R\) into BCNF using the minimal cover. (c) State whether the decomposition is lossless‑join and whether it preserves all dependencies.

Answer Options

Correct Answer A. Minimal cover: {A→B, A→C, BC→D, D→E}. BCNF decomposition: R1(B,C,D), R3(A,B), R5(A,C), R6(A,E). Lossless‑join: Yes. Dependency preserving: No.
B. Minimal cover: {A→B, A→C, BC→D, D→E}. BCNF decomposition: R1(B,C,D), R3(A,B), R5(A,C), R6(A,E). Lossless‑join: No. Dependency preserving: No.
C. Minimal cover: {A→B, BC→D, D→E}. BCNF decomposition: R1(B,C,D), R3(A,B), R5(A,C), R6(A,E). Lossless‑join: No. Dependency preserving: Yes.
D. Minimal cover: {A→B, A→C, BC→D, D→E}. BCNF decomposition: R1(A,B,C), R2(B,D), R3(A,E). Lossless‑join: Yes. Dependency preserving: Yes.
Correct Answer
A
Correct Option:
Minimal cover: {A→B, A→C, BC→D, D→E}. BCNF decomposition: R1(B,C,D), R3(A,B), R5(A,C), R6(A,E). Lossless‑join: Yes. Dependency preserving: No.

About This Question

This is Gce Model Questions Vol1 2023 Computer Studies Question 46. It is one of the objective questions from the 2023 Gce Model Questions Vol1 Computer Studies examination.

Difficulty level: Hard .

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