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A _____ indicates an absent value that may exist but be unknown or that may not exist at all.

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A _____ indicates an absent value that may exist but be unknown or that may not exist at all.

(a) Empty tuple

(b) New value

(c) Null value

(d) Old value

This question was posed to me during an interview.

Question is from Null Values Operations topic in section SQL : Queries, Constraints and Triggers of Database Management

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Correct choice is (c) Null value

Easy explanation - None.

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