Cant figure out this query

I have a table with multiple records.

Some have the same value in the 'subkey' field.
I want to select all the records from the table that have their highest MAINKEY.

So say there were 4 records in the table that has 3 fields (id, subkey and mainkey)

Each record has a unique id field but the subkeys are the same for the first two and the sub keys are the same for the last two while the Mainkey can be different.

So the tables looks sort of lLike this:

ID SK MK
1 10 2
2 10 3
3 25 2
4 25 3

I want to query and select one record for each subkey, but I want it to be record that has the highest mainkey. In this case, it would be records with ID 2 and 4.

I can not figure this out. :eek:

Any help would be GREATLY appreciated.This works...

SELECT [ID]
FROM yourtable T1
WHERE EXISTS (
SELECT SK, MAX(MK) AS MK
FROM yourtable T2
WHERE T1.SK=T2.SK
GROUP BY SK
HAVING T1.MK=MAX(T2.MK))|||select a.id, a.sk, a.mk from yourtable a
where a.mk in(select max(b.mk) from yourtable b
where a.sk = b.sk)|||Simpler even:

select a.sk, max(a.mk) as MK from yourtable a
group by a.sk