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SQL SELECT DISTINCT Statement

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The SQL SELECT DISTINCT Statement

The SELECT DISTINCT statement is used to return only distinct (different) values.

Example

Select all the different countries from the "Customers" table:

SELECT DISTINCT Country FROM Customers;
Try it Yourself »

Inside a table, a column often contains many duplicate values; and sometimes you only want to list the different (distinct) values.

SELECT DISTINCT Syntax

SELECT DISTINCT column1, column2, ...
FROM table_name;

Demo Database

Below is a selection from the Customers table used in the examples:

CustomerID CustomerName ContactName Address City PostalCode Country
1

 Alfreds Futterkiste Maria Anders Obere Str. 57 Berlin 12209 Germany
2 Ana Trujillo Emparedados y helados Ana Trujillo Avda. de la Constitución 2222 México D.F. 05021 Mexico
3 Antonio Moreno Taquería Antonio Moreno Mataderos 2312 México D.F. 05023 Mexico
4

 Around the Horn Thomas Hardy 120 Hanover Sq. London WA1 1DP UK
5 Berglunds snabbköp Christina Berglund Berguvsvägen 8 Luleå S-958 22 Sweden

SELECT Example Without DISTINCT

If you omit the DISTINCT keyword, the SQL statement returns the "Country" value from all the records of the "Customers" table:

Example

SELECT Country FROM Customers;
Try it Yourself »

Count Distinct

By using the DISTINCT keyword in a function called COUNT, we can return the number of different countries.

Example

SELECT COUNT(DISTINCT Country) FROM Customers;

Note: The COUNT(DISTINCT column_name) is not supported in Microsoft Access databases.

Here is a workaround for MS Access:

Example

SELECT Count(*) AS DistinctCountries
FROM (SELECT DISTINCT Country FROM Customers);

You will learn about the COUNT function later in this tutorial.

Test Yourself With Exercises

Exercise:

Select all the different values from the Country column in the Customers table.

      Country 
FROM Customers;

W3Schools SQL Video Tutorial. SELECT DISTINCT Statement

This video is an introduction to the SELECT DISTINCT statement in SQL.

Part of a series of video tutorials to learn SQL for beginners!

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