Which SQL clause is used to filter the result set after the GROUP BY clause has been applied?

The SQL clause used to filter the result set after the GROUP BY clause has been applied is the HAVING clause.

Here's a step-by-step explanation:

1. First, you use the SELECT statement to specify the columns you want in your result set.

2. Then, you use the FROM statement to specify the table from which you want to retrieve data.

3. If you want to group your results based on the values in a specific column, you use the GROUP BY clause. This will group all rows that have the same values in specified columns into aggregated data.

4. After the GROUP BY clause, you can use the HAVING clause to filter the results. The HAVING clause works like the WHERE clause, but it operates on grouped records brought by the GROUP BY clause.

5. The HAVING clause is particularly useful when you want to filter the result set based on a condition that involves an aggregate function. For example, you might want to find all departments in a company that have more than 10 employees. In this case, you would use the GROUP BY clause to group all employees by department, and then use the HAVING clause to filter out the departments that have more than 10 employees.

So, in summary, the HAVING clause is used to filter the result set after the GROUP BY clause has been applied.