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Question 153

In relational algebra, which operation selects columns?

  1. AProjection (π)
  2. BJoin (⋈)
  3. CSelection (σ)
  4. DUnion (∪)
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Correct answer: (A) Projection (π)

Explanation

Selection picks rows; projection picks columns.

From DSSSB TGT Computer Science Full Mock Test 3

This is question 153 of DSSSB TGT Computer Science Full Mock Test 3. See all questions of this paper with answers, or attempt the paper as a timed online test to get your score and all-India rank.