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The merge join can be used to compute

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The merge join can be used to compute

(a) Natural joins

(b) Equi joins

(c) Both the mentioned

(d) None of the mentioned

The question was posed to me in a job interview.

My question is taken from Join and Other Operations in section Query Processing and Optimization of RDBMS

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The correct answer is (c) Both the mentioned

To explain: The merge join can be used to compute both equijoins and natural joins. This is also called as the sort-merge-join algorithm.

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