UGC NET Dec-2020 and June-2021 Paper-2
October 17, 2023UGC NET CS 2016 Aug- paper-3
October 17, 2023Database-Management-System
| Question 249 |
An instance of relational schema R(A, B, C) has distinct values of A including NULL values. Which one of the following is true?
| A is a candidate key | |
| A is not a candidate key | |
| A is a primary key | |
| Both “A is a candidate key” and “A is a primary key” |
Question 249 Explanation:
Candidates key can take up NULL values so A should be true.
Correct Answer: A
Question 249 Explanation:
Candidates key can take up NULL values so A should be true.
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