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Question 103Asked in CIL MT Systems, 24 Aug 2026 (3:00 PM, CBT-26)

The entity integrity constraint ensures that:

  1. ANo foreign key value can be NULL
  2. BAll attribute values must belong to the same domain
  3. CEach tuple must reference at least one other tuple
  4. DNo primary key value can be NULL
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Correct answer: (D) No primary key value can be NULL

From CIL MT Systems PYQ, 24 Aug 2026 (3:00 PM, CBT-26)

This is question 103 of CIL MT Systems PYQ, 24 Aug 2026 (3:00 PM, CBT-26). 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.