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If on every legal database instant, the two expressions generate the same set of tuples, the expressions are called as

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If on every legal database instant, the two expressions generate the same set of tuples, the expressions are called as

(a) Equal

(b) Equivalent

(c) Similar

(d) Identical

I have been asked this question in semester exam.

My doubt stems from Transformation of Relational Expressions in section Query Processing and Optimization of RDBMS

1 Answer

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Best answer
Right option is (b) Equivalent

Easy explanation: If on every legal database instant, the two expressions generate the same set of tuples, the expressions are called as Equivalent relational algebra expressions. The order of the tuples is completely irrelevant for equivalency.

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