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which of the following is a unary operation?

(a) intersection

(b) projection

(c) join

(d) cartesian Product
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Option (b) projection
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@mohit+jain

(b) projection …..

 

The select, project, and rename operations are called unary operations, because they operate on one relation….

The other three operations i.e. join, Cartesian product and intersection operate on pairs of relations and are, therefore, called binary operations….

 

Example of unary operator:

Π<company = “Google”>(Table_name) …

 

 

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