Compare custom periods

Question

Hello,
I am trying to compare revenue. My query works with hierarchies periods (year, month, day), but I don't know how to compare with custom periods.
For exemple, comparing the revenue from [2013-05-02] to [2013-05-25] with exactly the same days in 2012. How can I achieve this ?
Here my query to compare 2012 and 2011 :
with
set Hotels as
    [Hotels].[Hotel ID].&[1015],
    [Hotels].[Hotel ID].&[5640],
    [Hotels].[Hotel ID].&[8800]
set Period as [Arrival Date].[Date].[Month].&[2012]&[1]:[Arrival Date].[Date].[Month].&[2012]&[12]
member [Arrival Date].[Date].[0] as sum({ Period })
member [Total Amount N-1] as (PARALLELPERIOD([Arrival Date].[Date].[Year], 1, [Arrival Date].[Date].[Year].&[2012]), [Measures].[Total Amount])
select
    [Measures].[Total Amount],
    [Measures].[Total Amount N-1]
} on 0,
    nonemptycrossjoin
        Hotels,
        Hotels.[Hotel].children,
    *{[Arrival Date].[Date].[0]}
} on 1
from [Booking_Cube]
Here the result :
                                              Total Amount  
 Total Amount N-1
1015    Hotelname1015   0    1275810.51     1495742.72
5640    Hotelname5640   0    17603.3           1100
8800    Hotelname8800   0    406                  (null)
Thanks

Answer 1

Hi AntoinePro,
According to your description, you can compare revenue with the hierarchy periods (year, month, day) by using the PARALLELPERIOD function, and now you want to compare with custom periods, right? In your scenario, does the time span of two custom periods
equal to each other?
Since
PARALLELPERIOD function returns a member from a prior period in the same relative position as a specified member. So if the first time span not equal to the second one (such as the first period is 3 days, and the second period is 2 month), I am afraid we
cannot compare it with the PARALLELPERIOD function.
In this case, I am afraid we need get the value for the two periods manually, here is a sample MDX query for your reference.
WITH MEMBER Measures.period1 AS SUM
([Date].[Calendar].[Date].&[20070515]:[Date].[Calendar].[Date].&[20070517])
, [Measures].[Internet Freight Cost]
MEMBER Measures.period2 AS SUM
([Date].[Calendar].[Month].&[2008]&[1]:[Date].[Calendar].[Month].&[2008]&[2])
, [Measures].[Internet Freight Cost]
SELECT {Measures.period1,Measures.period2} ON 0,
[Product].[Category].members on 1
FROM [Adventure Works]
Results:
Regards,
Charlie Liao
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