Can the GROUP BY clause be used with aggregate functions?

Yes, the GROUP BY clause can be used with aggregate functions. It is commonly used to group rows that have the same values in specified columns into summary rows, like counting, summing, or averaging those groups. For example:

SELECT column_name, COUNT(*)
FROM table_name
GROUP BY column_name;

In this example, the query counts the number of occurrences of each unique value in column_name.