Christopher Webb
You can do it in MDX, but only a few query tools will allow you to construct queries like this. I think vendors tend to refer to this capability as 'asymmetic sets'; I can only think of one tool I've seen recently that did this (Intelligencia - http://www.it-workplace.co.uk/i4wfeatures.aspx) but I'm sure that if you hunt around there will be others. Does anyone else know of one
Here's an MDX query to prove it's possible:
select
measures.[internet sales amount] on 0,
except
(
[Date].[Day Name].[Day Name].members
*
[Product].[Color].[Color].members
,{([Date].[Day Name].&[2], [Product].[Color].&[Red])}
) on 1
from
[Adventure Works]
HTH,
Chris