The COUNT(DISTINCT column_name) counts only the unique, non-null values in the column. If DISTINCT is specified, rows with the same value for the specified column will be counted as one.

May 3, 2026 · A SELECT query with COUNT(...) returns how many rows or values satisfy the query. The three forms are COUNT(*) for total rows, COUNT(expression) for non-NULL values of an expression, …

Jul 23, 2025 · This article provides a detailed explanation of SELECT and COUNT () in SQL, including syntax, examples, and practical use cases. Whether we’re filtering rows, counting non-NULL values, …

Jan 20, 2026 · This example combines COUNT(*) with other aggregate functions in the SELECT list. It returns the number of sales representatives with an annual sales quota greater than $500,000, and …

The SQL COUNT function is an aggregate function that returns the number of rows returned by a query. For example, you can use the COUNT function in the SELECT statement to get the number of …

Oct 21, 2021 · The COUNT() function appears in the SELECT part of the query and can accept a column name as an argument. Optionally, you can specify the DISTINCT keyword to count only the …

The COUNT () function in SQL is used to get the number of rows with the SELECT statement. In this tutorial, you will learn about the SQL COUNT () function with the help of examples.

Oct 24, 2025 · Instead of selecting twice, we can also count distinct values in one SELECT. Since we need multiple-column distinct rows, we can concatenate them beforehand via CONCAT.

Feb 16, 2026 · SELECT COUNT (DISTINCT cust_code): This is the main part of the SQL query. It uses the COUNT () function with the DISTINCT keyword to count the number of distinct (unique) values in …

Mar 17, 2026 · The COUNT function is one of the most common tools in SQL, and pairing it with a CASE WHEN expression unlocks the ability to count rows conditionally. Instead of returning a simple …