In SQL, after using the GROUP BY clause, you can use the HAVING clause to filter the results based on specific conditions. The HAVING clause works similarly to the WHERE clause, but it operates on the grouped results instead of the individual rows.

For example, suppose you have a table named "sales" with columns "product_name", "category", and "revenue". If you want to group the results by category and only show the categories that have a total revenue greater than $10,000, you could use the following query:

```
SELECT category, SUM(revenue) as total_revenue
FROM sales
GROUP BY category
HAVING total_revenue > 10000;
```

This query will group the results by category, calculate the total revenue for each category using the SUM function, and then filter the results to only show categories with a total revenue greater than $10,000.

Note that the HAVING clause is applied after the GROUP BY clause, so you can only reference aggregated columns (such as the total_revenue column in the example above) in the HAVING clause.
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