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Which of the following operations is associative

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Which of the following operations is associative

(a) Set union

(b) Set intersection

(c) Set difference

(d) Theta join

I got this question during an interview for a job.

The query is from Transformation of Relational Expressions topic in section Query Processing and Optimization of RDBMS

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Correct option is (d) Theta join

Explanation: The theta join operation is associative within a certain set of conditions whereas the rest of the operations are non-associative in each and every condition.

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