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      Question

      Which database constraint ensures that duplicate values

      cannot exist in a particular column?
      A Primary Key Correct Answer Incorrect Answer
      B Unique Key Correct Answer Incorrect Answer
      C Default Key Correct Answer Incorrect Answer
      D Foreign Key Correct Answer Incorrect Answer
      E Check Key Correct Answer Incorrect Answer

      Solution

      A Unique Key constraint ensures that all values in a column are distinct , preventing duplicate entries.

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