Q. What is a primary key?

  • (A) A key that allows duplicate values
  • (B) A key that can be null
  • (C) A unique key used to identify rows
  • (D) A key for foreign tables
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✅ Correct Answer: (C) A unique key used to identify rows
Explanation: A primary key uniquely identifies each record in a table and cannot be null.

Published by Mr. Dubey ⭐ 104.82K Points at 06-Jun-2025 10:30 pm in MySQL

Explanation by: Mr. Dubey
A primary key uniquely identifies each record in a table and cannot be null.

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