Normal-Forms

Question 1

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
Database-Management-SystemNormal-FormsGATE 1994
Question 1 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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