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The DISTINCT keyword in SQL is used in conjunction with the SELECT statement to return only unique values from a specified column or combination of columns. This is particularly useful when you want to eliminate duplicate entries from your query results.
Key Principles
Basic Usage: The DISTINCT keyword is placed immediately after the SELECT keyword and before the column names. It ensures that the result set contains only unique values for the specified columns. SELECT DISTINCT column1, column2 FROM table_name; This query will return all unique combinations of values in column1 and column2 from table_name12.
Single Column: When used with a single column, DISTINCT removes duplicate values in that column. SELECT DISTINCT Country FROM Customers; This query will return a list of unique countries from the Customers table1.
Multiple Columns: When used with multiple columns, DISTINCT ensures that each combination of values across the specified columns is unique. SELECT DISTINCT column1, column2 FROM table_name; This query will return unique combinations of column1 and column223.
COUNT with DISTINCT: The DISTINCT keyword can be used with the COUNT function to count the number of unique values in a column. SELECT COUNT(DISTINCT Country) FROM Customers; This query will return the number of unique countries in the Customers table12.
Handling NULL Values: The DISTINCT keyword treats NULL values as unique. If a column contains NULL values, they will be included in the result set as distinct entries. SELECT DISTINCT column_name FROM table_name; This query will include NULL as a unique value if it exists in column_name23.
SQL SELECT DISTINCT Statement - W3Schools
Learn how to use the SQL SELECT DISTINCT statement to return only distinct values from a table. See examples, syntax, demo database and video tutorial.
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SQL Distinct Clause - GeeksforGeeks
Learn how to use the SQL DISTINCT keyword to retrieve unique values from a database. See syntax, examples, and common use cases with aggregate function…
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- Published: Dec 9, 2016
How do I (or can I) SELECT DISTINCT on multiple columns?
Sep 10, 2008 · isn't SELECT DISTINCT a,b,c FROM t precisely the same thing as SELECT a,b,c FROM t GROUP BY a,b,c? @famargar for the simple case, yet, but they have different …
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Learn how to use the SQL DISTINCT keyword to fetch unique records from single or multiple columns/tables. See the syntax, examples and cases with COUNT() function and NULL values.
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This SQL tutorial explains how to use the SQL DISTINCT clause with syntax and examples. The SQL DISTINCT clause is used to remove duplicates from the result set of a SELECT statement.
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May 14, 2024 · Learn how to use the DISTINCT keyword in SQL to retrieve unique values from a column or combination of columns in a result set. See syntax, examples, FAQs and …
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The DISTINCT clause is used in the SELECT statement to filter out duplicate rows in the result set. You can use DISTINCT when you select a single column, or when you select multiple columns as we did in our example.
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Feb 26, 2025 · Alternatives à SQL SELECT DISTINCT. Bien que SELECT DISTINCT soit un moyen pratique de supprimer les doublons dans les requêtes de données, DISTINCT n’est …
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