SQL: find all latest value = 'X'

I have table with three pertinent columns:

personid rating ratingdate
======== ====== ==========

01000101    B     10-JAN-97
12304956          22-NOV-96
10203049    A     15-DEC-96
01000101    A     10-JUL-96

I need to find all personid's where the most recent rating for that person was 'A'. Null ratings don't count. I've come up with a query that seems to work, but it looks messy:

select personid, ratingdate
from rating_table
where rating = 'A'
intersect
select personid, max(ratingdate)
from rating_table
where rating is not null
group by personid

Is there a better way? Is my query even working the way I think it is? Received on Sun Oct 12 1997 - 00:00:00 CDT