Multiple choice technology programming languages

What is the use of UNIQUE keyword?

  1. It will select only the field on which the keyword is specified.

  2. It will select only one record.

  3. It will avoid to enter duplicate key values.

  4. None of the above.
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C Correct answer
Explanation

The UNIQUE keyword in DDS prevents duplicate key values from being entered into a database file. It enforces data integrity at the file level. It does not select fields or records - it's a constraint, not a selection tool.

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