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Which of the following operations are associative(a) Natural joins(b) Theta joins(c) Both the mentioned(d) None of the mentionedThe question was asked by my college professor while I was bunking the class.My question is based upon Transformation of Relational Expressions topic in portion Query Processing and Optimization of RDBMS |
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Answer» RIGHT choice is (c) Both the mentioned Explanation: Both natural join operation and theta join operation are associative. The COMMUTATIVITY and ASSOCIATIVITY of the join OPERATIONS are important for join reordering in query OPTIMIZATION. |
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