Query distinct with top date

Question

I am querying for distinct data from one table but I need
only the most recent data. I am currently using the query included
below, but if there are two entries for any of the paddocks and the
species are different in them I will get both entries returned. I
need it to return just the most recent of those two entries. How do
I do this??
If this were my data I would only want it to return: 1, cool
and 2, warm
Paddock Species Date
1 Warm 1/1/05
1 Cool 1/7/05
2 1/5/05
2 Warm 1/7/05
<cfquery name="getpaddocks" datasource="dairy">
SELECT this.paddock, this.species
FROM
(select distinct paddock, species
FROM dairy.dbo.paddockdata
WHERE FarmId='#session.data.farmid#'
and year(datadate)= year(current_timestamp)
)as this
ORDER BY RIGHT('00000' + paddock, 3)
</cfquery>

Answer 1

something like this might work
select p.paddock thepaddock, p.species thespecies
from paddockdata p join
select paddock tpaddock, species tspecies, max(datadate)
maxdate
from paddockdata
where FarmId='#session.data.farmid#'
and year(datadate)= year(current_timestamp)
group by paddock, species
) temp on paddock = tpaddock and species = tspecies and
datadate = maxdate
where FarmId='#session.data.farmid#'
and year(datadate)= year(current_timestamp)