Which operation is used if we are interested certain columns, Database Management System

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Which operation is used if we are interested in only certain columns of a table?

PROJECTION operation is used if we are interested in only certain columns of a table.

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Consider a database application that deals with an Employee relation with information such as SIN, name, data of birth (DOB), and DID (the ID of the department at which the employe

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Define a view and a trigger. Construct a view for the above relations that have the information about suppliers and the elements they supply. The view holds the S#, SNAME, P# , PNA

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