Question 14045 – NIC-NIELIT Scientist-B 2020
December 11, 2023Software-Engineering
December 11, 2023Database-Management-System
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Question 314
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What is the highest normal form of a relation R(A, B, C, D, E) with FD set?
{B → A, A → C, BC → D, AC→ BE}
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2NF
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3NF
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BCNF
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4NF
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Question 314 Explanation:
B → A
A → C
BC → D
AC → BE
B+ = BACDE
A+ = ACBED
So A & B are Candidate key.
There is no partial dependency, so in 2NF.
But in the BC → D, neither BC is key nor D is prime attribute, hence not in 3NF.
Note: Official Key given option-C is correct.
A → C
BC → D
AC → BE
B+ = BACDE
A+ = ACBED
So A & B are Candidate key.
There is no partial dependency, so in 2NF.
But in the BC → D, neither BC is key nor D is prime attribute, hence not in 3NF.
Note: Official Key given option-C is correct.
Correct Answer: B
Question 314 Explanation:
B → A
A → C
BC → D
AC → BE
B+ = BACDE
A+ = ACBED
So A & B are Candidate key.
There is no partial dependency, so in 2NF.
But in the BC → D, neither BC is key nor D is prime attribute, hence not in 3NF.
Note: Official Key given option-C is correct.
A → C
BC → D
AC → BE
B+ = BACDE
A+ = ACBED
So A & B are Candidate key.
There is no partial dependency, so in 2NF.
But in the BC → D, neither BC is key nor D is prime attribute, hence not in 3NF.
Note: Official Key given option-C is correct.
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