UGC NET Dec-2020 and June-2021 Paper-2
October 17, 2023UGC NET CS 2016 Aug- paper-3
October 17, 2023Candidate-key
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Question 2
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An instance of relational schema R(A, B, C) has distinct values of A including NULL values. Which one of the following is true?
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A is a candidate key
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A is not a candidate key
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A is a primary key
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Both “A is a candidate key” and “A is a primary key”
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Question 2 Explanation:
Candidates key can take up NULL values so A should be true.
Correct Answer: A
Question 2 Explanation:
Candidates key can take up NULL values so A should be true.
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