Which of the following types of table constraints prevents the entry of duplicate rows?

Which of the following types of table constraints prevents the entry of duplicate rows?

  1. a) Foreign keys
  2. b) Primary keys
  3. c) Unique keys
  4. d) Candidate keys

From the BPSC Assistant Programmer (CSE) September 2022 – Preliminary exam, question 89 of 90.

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