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Which of the following operations is associative(a) Set union(b) Set intersection(c) Set difference(d) Theta joinI 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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Answer» 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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