Mastering Oracle's SELECT DISTINCT
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Questions and Answers

Which clause is used in a SELECT statement to filter duplicate rows in the result set?

  • HAVING
  • UNIQUE
  • DISTINCT (correct)
  • GROUP BY

    • What is the difference between DISTINCT and UNIQUE?

  • DISTINCT can only be used in the SELECT statement, while UNIQUE can be used in any SQL statement
  • DISTINCT is not SQL standard, while UNIQUE is
  • There is no difference, they are synonyms (correct)
  • DISTINCT is used for filtering duplicate rows, while UNIQUE is used for defining unique constraints on columns

    • In which clause should you use if you want to apply the DISTINCT to some columns while skipping other columns?

  • ORDER BY
  • HAVING
  • GROUP BY (correct)
  • WHERE

    • How does the DISTINCT clause treat NULL values?

    <p>It considers NULL values as duplicates of each other</p> Signup and view all the answers

    How do you retrieve unique data based on multiple columns using the SELECT DISTINCT statement?

    <p>Specify the column list in the SELECT clause</p> Signup and view all the answers

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