⇒ Projection Operator (Π) is a unary operator in relational algebra that performs a projection operation.
⇒ It projects (or displays) the particular columns {or attributes} from a relation and It delete column(s) that are not in the projection list.
⇒ It is denoted by Π.
⇒ Duplicate rows are automatically eliminated from result.
⇒ Notation:
Π A1,A2,A3...An (r)
Or
Π Attribute list (relation name/ table name)
