How to sort specific column when using GROUPING SETS in SQL Server?

Question

If I remember correctly, in SQL Server, it is not recommended to use "ORDER BY" when there's already a GROUP BY GROUPING SETS.
I have two columns: [UPC#] & [Description] both are varchar.
My grouping sets is like this:
GROUP BY
GROUPING SETS
([UPC],[Description])
I don't have 'ORDER BY' but it's automatically sorting the Description column.
If I added a 3rd column, sum(Qty), then it doesn't sort by Description anymore. But if I added
ORDER BY [Description]
then the grand total of sum(Qty) will be at the first row instead of the last.
Is there a way to sort the Description column and still let the grand total of sum(Qty) be at the last row instead?
Thanks.

Answer 1

Yes, it works.
Thank you.
Could you kindly explain the logic?
I don't quite understand the "= 3 THEN 1 ELSE 0" part.
Is the #3 mean the column index 3?
GROUPING_ID returns a bit mask value depending on number of columns grouped in the result 
So when you do GROUPING_ID(([UPC]),([Description]))
it has two columns UPC and Description so bit mask will be as follows
0 ie 00 for rows grouped by both UPC and Description fields
1 ie 01 for rows grouped by UPC ie UPC subtotals
2 ie 10 for rows grouped by Description ie Description subtotals
3 ie 11 for rows not grouped by both columns ie Grand total
see
http://msdn.microsoft.com/en-IN/library/bb510624.aspx
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