In SQL, the `LIMIT` keyword is used to restrict the number of rows returned by a query. You can use the `LIMIT` keyword after a `GROUP BY` clause to control the number of groups (aggregated rows) returned.

Consider the following example using a fictional `sales` table:

```sql
-- sales table
+------------+------------+-------+
| date       | product_id | sales |
+------------+------------+-------+
| 2021-01-01 | 1          | 10    |
| 2021-01-01 | 2          | 15    |
| 2021-01-02 | 1          | 12    |
| 2021-01-02 | 2          | 10    |
| 2021-01-03 | 1          | 20    |
| 2021-01-03 | 2          | 18    |
+------------+------------+-------+
```

Suppose you want to find the total sales for each product but only return the top 2 products by total sales. You can use the following query with `GROUP BY` and `LIMIT`:

```sql
SELECT
  product_id,
  SUM(sales) as total_sales
FROM
  sales
GROUP BY
  product_id
ORDER BY
  total_sales DESC
LIMIT
  2;
```

This query would return:

```
+------------+-------------+
| product_id | total_sales |
+------------+-------------+
| 1          | 42          |
| 2          | 43          |
+------------+-------------+
```

In this example, the `GROUP BY` clause groups the data by `product_id`, and the `SUM(sales)` calculates the total sales for each product. The `ORDER BY` clause sorts the results in descending order by `total_sales`, and the `LIMIT` keyword restricts the result set to the top 2 rows.
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