Which of the following is a unary operation?
2020
Which of the following is a unary operation?
- A.
Intersection
- B.
Projection
- C.
Join
- D.
Cartesian Product
Attempted by 433 students.
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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.