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Reported Question / Answer
Q.) An instance of relational schema R (A, B, C) has distinct values of A including NULLvalues. Which one of the following is true?
1)
A is not a candidate key
2)
A is a candidate key
3)
Both (A) and (C)
4)
A is a primary Key
5)
NULL
Answer :
1
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Human Verification : Answer 2 + 3 = ?
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