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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
An instance of relational schema 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 and C
An instance of relational schema 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 and C
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