Sort Group by a Formula

Question

Hello,
I have a group called Part number with a few production jobs with in that group.  I also have a SPQ (Std Production Qty) for each Part number.  I have a formula called @AvgMQty that gets the average prodution qty. I have another formula called@diff that takes the ((SPQ-AvgMQty)/SPQ)*100 and I want to sort my report by this formula
The Idea is to run the report for a given date range and show the Parts that have largest percent difference between the SPQ qty and what production is running.  I want to show the largest difference at the top of the report becasue the report can be very long.
I've found a few other forums where people say this cannot be done becasue you can't sort a group using a "SUM" type of formula. 
I would think what I'm doing is very common and someone knows how to do it!!!
thanks for your help

Answer 1

Give this a whirl - you might want to check it first by creating a new report, but rather than selecting tables, you'll want to use "Command" as the datasource once you've connected to your SQL Server.  As it is, this will select stuff between your previously used dates - but let's worry about that later.  For now, just check that the avg_prod_qty and sort_formula columns are giving you correct values...
SELECT
jomast.fpartno,
jomast.fpartrev,
inrtgc.fspq,
joitem.fmqty,
jomast.fddue_date,
jomast.fjobno,
jomast.fac,
jomast.fstatus,
jomast.fprodcl,
averages.avg_prod_qty,
(inrtgc.fspq - averages.avg_prod_qty)/inrtgc.fspq*100 as sort_formula
FROM M2MData03.dbo.jomast jomast
LEFT OUTER JOIN M2MData03.dbo.joitem joitem
     ON jomast.fjobno=joitem.fjobno
     AND jomast.fpartno=joitem.fpartno
     AND jomast.fpartrev=joitem.fpartrev
     AND jomast.fsono=joitem.fsono
LEFT OUTER JOIN M2MData03.dbo.inrtgc inrtgc
     ON jomast.fpartno=inrtgc.fpartno
     AND jomast.fpartrev=inrtgc.fcpartrev
left outer join --get the avg. production qty for a part number
     (select jomast.fpartno,
     avg(convert(float, joitem.fmqty)) as avg_prod_qty
     from jomast
     left outer join joitem
     ON jomast.fjobno=joitem.fjobno
     AND jomast.fpartno=joitem.fpartno
     AND jomast.fpartrev=joitem.fpartrev
     AND jomast.fsono=joitem.fsono
     group by jomast.fpartno) averages
on averages.fpartno = jomast.fpartno
WHERE (jomast.fddue_date>={ts '2008-06-01 00:00:00'}
AND jomast.fddue_date<{ts '2009-06-01 00:00:01'})
AND jomast.fac='Default'
AND jomast.fjobno LIKE 'I%'
AND jomast.fpartrev='NS'
AND jomast.fstatus='CANCELLED'
ORDER BY jomast.fprodcl, jomast.fpartno DESC