A

Admin • 833.24K Points
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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
  • Correct Answer - Option(C)
  • Views: 44
  • Filed under category MySQL
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Explanation by: Admin

A primary key uniquely identifies each record in a table and cannot be null.

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