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Question 153

A primary key column:

  1. ACan repeat values
  2. BMust be a foreign key
  3. CCan contain NULL values
  4. DMust be unique and NOT NULL
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Correct answer: (D) Must be unique and NOT NULL

Explanation

Entity integrity rule.

From DSSSB TGT Computer Science Full Mock Test 2

This is question 153 of DSSSB TGT Computer Science Full Mock Test 2. 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.