How to Select Top Results in a Group By

The other day I ran into an interesting problem with Oracle SQL. I used to use Microsoft SQL Server and last year switched over to Oracle and had to adjust to the peculiarities of Oracle SQL. I had a report that gave the top 10 results of an aggregate query. In SQL this was simple and looked something like this:

SET ROWCOUNT 10
SELECT field1, field2, COUNT(*)
FROM table
GROUP BY field1, field2
ORDER BY COUNT(*) DESC

But when trying to do this in Oracle SQL with no "ROWCOUNT" feature, I was stumped at first. Then I came up with the following which is a bit of a hack, but works:

SELECT field1, field2, CNT
FROM (
SELECT field1, field2, COUNT(*) AS CNT
FROM table
GROUP BY field1, field2
ORDER BY COUNT(*) DESC
)
WHERE ROWNUM <= 10;

If anyone knows of a more standard approach, let me know.