How to Remove Duplicates from SQL Result Sets Using the DISTINCT Command

Learn how to remove duplicates from SQL query results using the DISTINCT command to retrieve unique values efficiently.

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To remove duplicates from a result set in SQL, use the DISTINCT command. For instance, execute a query like SELECT DISTINCT column_name FROM table_name to retrieve unique values from a specified column, effectively eliminating duplicates.

FAQs & Answers

  1. What does the DISTINCT command do in SQL? The DISTINCT command in SQL returns unique values from a column by eliminating duplicate entries in the result set.
  2. How do I remove duplicate rows in a SQL query? You can remove duplicate rows by using the SELECT DISTINCT statement, which selects only unique rows from the specified columns.
  3. Can DISTINCT be used on multiple columns? Yes, the DISTINCT command can be applied to multiple columns, returning unique combinations of values across those columns.

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