COUNT DISTINCT refers to an aggregate function that points to the unique, repeated values in one single column of a data table. Unlike the regular type of COUNT function, which counts the number of all recurrences, COUNT DISTINCT only considers distinct values. It's a handy tool for getting precise counts and insights from your data, especially when dealing with datasets that might contain duplicate entries.
SELECT COUNT(DISTINCT column_name) FROM table_name; This simple query provides you with the frequency of unique values in the respective column of the passed table. It's a very useful feature in SQL for tasks like finding the number of different categories, unique customers, or distinct items in your dataset.
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