it’s a common requirement to create a report that shows last N days of a business metric – so I thought I’ll post a template here for SQL server analysis server’s MDX query:

[code language=”SQL”]

WITH
MEMBER [Measures].[Sales_last_15_days] AS
Sum
(
{
[Calendar].[Date YYYYMMDD].CurrentMember.Lag(14)
:
[Calendar].[Date YYYYMMDD].CurrentMember
}
,[Measures].[Sales]
)

MEMBER [Measures].[CurrDate] as
"[Calendar].[Date YYYYMMDD].[" + Cstr(Year(Now())*10000+month(now())*100+day(now())) +"]"

SELECT
{
[Measures].[Sales_last_15_days]
} ON COLUMNS
FROM
[CubeName]
WHERE
STRTOMEMBER([Measures].[CurrDate])

[/code]

Here are things that you’ll need to adjust to make it work for your scenario:

1. Date Dimension Attribute & it’s format. The example shows yyyymmdd but you could have different format of the date.

2. Measure name. Instead of [Measures].[Sales] you’ll have to replace it with your business metric. Also, make sure you are using the right aggregate function, in the example above I have used SUM but you’ll have to change this based on your requirement.

3. Create a parameter and use it in index for the Lag function.

4. change [cubename] to your cube name.

I hope this gives you a good starting point to create last N days for your business metric.