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In a given relationship R, if an attribute A uniquely defines all other attributes, then the attribute A is a key attribute which is also known as the _________ key.

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In a given relationship R, if an attribute A uniquely defines all other attributes, then the attribute A is a key attribute which is also known as the _________ key.

(a) Candidate

(b) Join

(c) Functional

(d) None of the Mentioned

I have been asked this question in examination.

This is a very interesting question from Normalization in division Planning Oracle Applications of Oracle

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The correct answer is (a) Candidate

The explanation is: A candidate key is a column, or set of columns, in a table that can uniquely identify any database record without referring to any other data. Each table may have one or more candidate keys.

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