Multiple choice

Which of the following yields a vertical subset of the relation, either to reduce the number of attributes in a resultant relation or to reorder attributes in DBMS?

  1. Projection

  2. Selection

  3. JOIN

  4. Difference

  5. Intersection

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A Correct answer
Explanation

Projection yields a vertical subset of the relation, either to reduce the number of attributes in a resultant relation or to reorder attributes.