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Which of the following is used to denote the selection operation in relational algebra?

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Which of the following is used to denote the selection operation in relational algebra?

(a) Pi (Greek)

(b) Sigma (Greek)

(c) Lambda (Greek)

(d) Omega (Greek)

I got this question in an international level competition.

The question is from Relational Algebra in chapter Relational Algebra of Database Management

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The correct answer is (b) Sigma (Greek)

The best explanation: The select operation selects tuples that satisfy a given predicate.

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