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Which of the following joins preserves the tuples of the relation on the left side of the operator?

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Which of the following joins preserves the tuples of the relation on the left side of the operator?

(a) Left outer join

(b) Natural join

(c) Right outer join

(d) None of the mentioned

I have been asked this question in an interview.

Enquiry is from Join and Other Operations in division Query Processing and Optimization of RDBMS

1 Answer

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Right choice is (a) Left outer join

Explanation: Left outer join and full outer join both preserve the tuples on the left side of the operator.

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