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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?  

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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)

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1 Answer

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by (30.4k points)

(a) A is a candidate key

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