MDX question: Create a calculation to obtain the SUM of a measure in the previous month

Question

Hi，
I need to create a calculation, with the SUM of a measure ([Measures].[SalesAmount]), like:

SUM([Measures].[SalesAmount])-SUM([Measures].[Sales Amount] in the previous month)

Can anyone help me?

Answer 1

Hi @KamiFen ,
You could use the Lag function, and the relevant position of your time dimension.
If you are at Time.Hierarchy.Day then you would use:

Time.Hierarchy.CurrentMember.Parent.Lag(1)  

If you are already at the Month level of the heirarchy you could just use the Lag function:

Time.Hierarchy.CurrentMember.Lag(1)  

Best Regards,
Joy

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