For each record in SELECT

Hi,

I have a question here:

I have a table with this fields:

month
description
amount

now I have to write a query that retrieves the sum of the amount from
the minimum month to the maximum month registered for each diferent
description.

Of course there are cases when a particular description has not record
for all the months in that period. I mean, suppouse you have this
records:

month description amount
-----------------------------------------------
June description1 100
July description1 500
August description1 600
June description2 300
August description2 400

how you write a query that outputs something like this:

June July August
------------------------------------------
description1 | 100 500 600
description2 | 300 0 400

My problem is for the 0 value.

I hope I've explained clearly my question.

Thanks for the help.

Best Regards.

--
Luis Magaña.
Gnovus Networks & Software.
www.gnovus.com