How to add the lost keys

There are four areas in my compay: E, W, S, N.
When I use aggregate function to count to order number of each area, there
maybe some area disappear
in the result, like
select Area, Count(*) from orders
Area OrderCount
E 12
W 15
N 14
But I want to result to
Area OrderCount
E 12
W 15
S (null or 0)
N 14
How can I do?
select A.Area, Count(*)
from orders O
LEFT JOIN Areas A
ON A.Area = O.Area
That should help.
Jens Suessmeyer.