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Using the ______ clause retains only one copy of such identical tuples.

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Using the ______ clause retains only one copy of such identical tuples.

(a) Null

(b) Unique

(c) Not null

(d) Distinct

This question was addressed to me in an international level competition.

The doubt is from Null Values Operations in portion SQL : Queries, Constraints and Triggers of Database Management

1 Answer

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Best answer
Right option is (d) Distinct

Best explanation: Unique is a constraint.

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