An instance of relational schema R (A, B, C) has distinct values of A including NULL values. Which one of the following is true ? - Study24x7
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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 ?

A

A is a candidate key

B

A is not a candidate key

C

A is a primary Key

D

Both (A) and (C)

Databases
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