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The _______ operator takes the results of two queries and returns only rows that appear in both result sets.

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The _______ operator takes the results of two queries and returns only rows that appear in both result sets.

(a) Union

(b) Intersect

(c) Difference

(d) Projection

This question was addressed to me during an interview.

My enquiry is from Relational Query Operations and Relational Operators topic in division The Relational Model of Database Management

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Right option is (b) Intersect

The best I can explain: The union operator gives the result which is the union of two queries and difference is the one where query which is not a part of second query.

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