Database-Management-System
March 6, 2024Database-Management-System
March 6, 2024Database-Management-System
| Question 12 |
An instance of a relational scheme R(A, B, C) has distinct values for attribute A.
Can you conclude that A is a candidate key for R?
| Yes | |
| No |
Question 12 Explanation:
Because FD’s are defined on the schema itself, not the instance. So, based on the state of the instance we cannot say what holds for schema (there can be many instances for R).
Correct Answer: B
Question 12 Explanation:
Because FD’s are defined on the schema itself, not the instance. So, based on the state of the instance we cannot say what holds for schema (there can be many instances for R).