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May 29, 2024 · In SQL, the COUNT () function is used to count the number of rows that match a specified condition. The DISTINCT keyword is used to return only distinct (unique) values. When combined, COUNT and DISTINCT can be used to count the number of unique values in a column or a set of columns.
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Learn how to use COUNT(DISTINCT) to count the number of unique values in a SQL query. See examples, explanations and answers from SQL experts and users.
Learn how to use the COUNT and DISTINCT functions to find the number of different non-NULL values in a column. See an example query and a table of contents for more SQL cookbooks.
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.
In SQL Server, the COUNT() function is an aggregate function that returns the total number of rows that meet a certain condition. Sometimes, you may want to count the number of distinct values in a column that meets a condition. To do that, you can use the DISTINCT option:
Jun 28, 2023 · SELECT COUNT(DISTINCT column_name) FROM table_name; By applying the COUNT DISTINCT query, users can gather valuable insights from their data, such as: Identifying the number of unique products in a store’s inventory. Discovering the total number of distinct clients for a business.
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Jun 26, 2019 · This new function of SQL Server 2019 provides an approximate distinct count of the rows. There might be a slight difference in the SQL Count distinct and Approx_Count_distinct function output. You can replace SQL COUNT DISTINCT with the keyword Approx_Count_distinct to use this function from SQL Server 2019.