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.

Nov 22, 2025 · We can use the COUNT () function along with CASE WHEN to count rows that match a specific condition. This is helpful when we want to count rows based on certain criteria without …

Jan 20, 2026 · COUNT(*) returns the number of rows in a specified table, and it preserves duplicate rows. It counts each row separately, including rows that contain null values.

Jun 29, 2023 · Using the COUNT () function with GROUP BY is one of the most common SQL constructs in aggregate queries. Read this article to find out how to use COUNT () with GROUP BY …

This tutorial shows you how to use the SQL COUNT () function to get the number of rows in a table.

Feb 16, 2026 · SELECT COUNT (*): This part of the query selects the count of all rows in the specified table. The COUNT (*) function is an aggregate function that returns the number of rows in the result set.

Learn how to use COUNT() in SQL for total rows, filtered results, and unique values, including how NULL and DISTINCT affect counts.

This SQL tutorial explains how to use the SQL COUNT function with syntax, examples, and practice exercises. The SQL COUNT function is used to count the number of rows returned in a SELECT …

This tutorial shows you how to use the SQL Server COUNT () aggregate function to count values in a set of values.

Jan 12, 2026 · That’s why every SQL learner must clearly understand how COUNT() works especially when combined with the WHERE clause. In this article, we will explore the COUNT() function in SQL …