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Which of the following set operations is not commutative?

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Which of the following set operations is not commutative?

(a) Union

(b) Intersection

(c) Set difference

(d) None of the mentioned

I had been asked this question in semester exam.

The origin of the question is Transformation of Relational Expressions in section Query Processing and Optimization of RDBMS

1 Answer

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Best answer
Right choice is (c) Set difference

For explanation I would say: The set difference operation is not commutative. As the position of the set difference operator affects the result of the operation.

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