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Which is a unary operation:

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Which is a unary operation:

(a) Selection operation

(b) Primitive operation

(c) Projection operation

(d) Generalized selection

This question was posed to me by my school principal while I was bunking the class.

Question is taken from Relational Algebra topic in section Relational Algebra of Database Management

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The correct answer is (d) Generalized selection

Easiest explanation - Generalization Selection takes only one argument for operation.

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