MDX Expression for a Cube

I have a fact table with the following structure:
DateID
BuyerID
SellerID
Amount

Both BuyerID and SellerID are UserID, meaning a user can be both a Buyer and a Seller.  Moreover, a Buyer can sell something to himself.  In this case, BuyerID and SellerID are the same.

Now this structure has been converted to a cube.  I want to create an Calculation member to show the total Amount of sales of a single user.  This amount should NOT include those Amount Sales that has the same BuyerID and SellerID (whatever the user sells to himself shouldn't be counted into the Total Amount of sales of the user).

How can I create this Calculation member?  Thanks.
thomaszhwangAsked:
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Tim HumphriesDirectorCommented:
Hi,

It would help if you posted the structures of the user hierarchies you have created. In the absence of these I will make some assumptions:

As you have User id acting in two roles I'll assume that you have hierarchies similar to:

[User].[Seller] and
[User].[Buyer] related to the fact table

I'll take the Amount as being [Measures].[Sales Amount]

As you want the Sales, then I'll assume that in your query you have [User].[Seller].Members on rows - this is important as we need to know  the Seller.Currentmember

You should then be able to use a calculation similar to:

MEMBER [Measures].[Seller Only Amount] As [Measures].[Sales Amount] - ([Measures].[Sales Amount], LINKMEMBER([User].[Seller].CURRENTMEMBER, [User].[Buyer]))

This should find the sales associated with the user as a buyer in the current tuple where the user is the seller i.e. where the user is both buyer and seller.


Tim
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thomaszhwangAuthor Commented:
Thanks.
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Microsoft SQL Server 2008

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