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Which of the following set operations is not commutative?(a) Union(b) Intersection(c) Set difference(d) None of the mentionedI 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 |
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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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