Queries :: Count Unique Values Without GROUP BY

I am currently using the below code to query values that have a unique "OverrideDescription" and where by the "Upload Date" is always the latest.

SELECT t1.*
FROM [DaisyServiceRates-Amended] AS t1 LEFT JOIN [DaisyServiceRates-Amended] AS t2 ON (t1.OverrideDescription = t2.OverrideDescription) AND (t1.[Upload Date] < t2.[Upload Date])
WHERE t2.OverrideDescription IS NULL;

However I also need to be able to do a unique count of the [OverrideDescription] field.

I have found methods whereby I can do use, but they all use a GROUP BY function, the issue being that when I use this method it prevents be from updating the values saying "recordset not updateable".

Any method that does not use the GROUP function. I did also try preforming the COUNT on a separate table and doing as JOIN, but this also prevented updates to the date.