Hi Old hand,
i think the OP means he need some average data for 1 particular column even while only a subset is returned in the actual report
If this is the case then i would look into Creating a SP (not needed but easy to maintain)
and some code like the one below (just example, not working code)
;with cteData as (
select col1,col2, datecol1, sum(numcol) as totalFordataset from table x
)
select * from cteData where datecol1 between @DateFrom and @DateTill
You cab easily put this into SSRS Querywindow, it should work without a stored procedure to.
Hope this helps you on your way
Wkr,
Van Heghe Eddy