City Guilds Model Questions Vol1 2021 Information Technology Question 11

Practice objective / multiple choice question 11 from the 2021 City Guilds Model Questions Vol1 Information Technology examination.

City Guilds Model Questions Vol1 2021 Information Technology Objective / Multiple Choice Hard Difficulty
Question 11 CITY_GUILDS_MODEL_QUESTIONS_VOL1 • 2021 • INFORMATION_TECHNOLOGY • objective

Consider a relation R(E, D, P, H, S) with the functional dependencies: (i) \(E \rightarrow D, S\); (ii) \(P \rightarrow H\); (iii) \(D \rightarrow E\). (a) Determine all candidate keys of R. (b) State the highest normal form that R satisfies. (c) Decompose R into a set of relations that are in Boyce‑Codd Normal Form (BCNF). Indicate whether the decomposition preserves all functional dependencies.

Answer Options

A. Candidate keys: {E,P} and {D,P}. Highest normal form: 2NF. BCNF decomposition: R1(E,D,S), R21(P,H), R22(E,P). Dependency preservation: Yes.
B. Candidate keys: {E,P}. Highest normal form: 1NF. BCNF decomposition: R1(E,D,S), R2(P,H), R3(E,P). Dependency preservation: No.
Correct Answer C. Candidate keys: {E,P} and {D,P}. Highest normal form: 1NF. BCNF decomposition: R1(E,D,S), R21(P,H), R22(E,P). Dependency preservation: No.
D. Candidate keys: {E,D} and {P,S}. Highest normal form: 1NF. BCNF decomposition: R1(E,D), R2(P,H,S), R3(E,P). Dependency preservation: No.
Correct Answer
C
Correct Option:
Candidate keys: {E,P} and {D,P}. Highest normal form: 1NF. BCNF decomposition: R1(E,D,S), R21(P,H), R22(E,P). Dependency preservation: No.

About This Question

This is City Guilds Model Questions Vol1 2021 Information Technology Question 11. It is one of the objective questions from the 2021 City Guilds Model Questions Vol1 Information Technology examination.

Difficulty level: Hard .

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