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) IdenticalI have been asked this question in semester exam.My doubt stems from Transformation of Relational Expressions in section Query Processing and Optimization of RDBMS

If on every legal database instant, the two expressions generate the s

1.	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) IdenticalI have been asked this question in semester exam.My doubt stems from Transformation of Relational Expressions in section Query Processing and Optimization of RDBMS
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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