Which of the following is a unary operation?
2019
Which of the following is a unary operation?
Answer: B. Projection — A unary operation is an operation that is performed on a single relation. In Relational Algebra, Projection (𝝅) and Selection (σ) are primary unary…
- A.
Intersection
- B.
Projection
- C.
Join
- D.
Cartesian Product
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Correct answer: B
A unary operation is an operation that is performed on a single relation. In Relational Algebra, Projection (𝝅) and Selection (σ) are primary unary operations. Intersection, Join, and Cartesian Product are binary operations because they require two relations to operate. The correct option is B.
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