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Database-Management-System
March 6, 2024
Database-Management-System
March 6, 2024
Database-Management-System
March 6, 2024
Database-Management-System
March 6, 2024

Database-Management-System

Question 10

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?

A
Yes
B
No
Question 10 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 10 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).
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