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Question 154

Which statement about a foreign key is TRUE?

  1. AIt must always be unique
  2. BIt cannot reference a primary key
  3. CIt can contain NULL values
  4. DIt must be the first column
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Correct answer: (C) It can contain NULL values

Explanation

A NULL foreign key simply means no related row.

From DSSSB TGT Computer Science Full Mock Test 5

This is question 154 of DSSSB TGT Computer Science Full Mock Test 5. 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.