Which SQL Command Removes Duplicate Records? How to Use DISTINCT

Learn how to remove duplicate records in SQL using the DISTINCT keyword with examples for clean query results.

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Use the `DISTINCT` keyword in SQL to remove duplicate records from your query results. For example: `SELECT DISTINCT column_name FROM table_name;`. This command retrieves records with unique values, excluding duplicates.

FAQs & Answers

  1. What does the DISTINCT keyword do in SQL? The DISTINCT keyword in SQL filters out duplicate rows in the query result, returning only unique records.
  2. How can I remove duplicates from a SQL query? You can remove duplicates by using the DISTINCT keyword in your SELECT statement, which ensures only unique rows are retrieved.
  3. Can DISTINCT be used on multiple columns in SQL? Yes, DISTINCT can be applied to multiple columns, returning unique combinations of the selected columns.
  4. Is using DISTINCT the only way to remove duplicates in SQL? While DISTINCT is the simplest method, other approaches include using GROUP BY or ROW_NUMBER() functions depending on the database and requirements.

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