Deltatype in SSRS Query

I have a cube with several measures like cost (bound to a calender week hierarchy) and a calculated measure representing the value from the week before (it is a calculated measure navigating in the CW-hierarchy prevmember). Same for work (Containing an integer
value, also prevmember for the previous week)
A query can somehow look like this:
Document Work PrevWeek Work week Delta Work Deltatype
ABC123 5 10 5 3
ABC124 10 10 2
ABC125 5 5 0 1
I have a calculated column called "Deltatype" with this expression:
IIF
(ISEMPTY([Measures].[Work PrevWeek]) AND ISEMPTY([Measures].[Work]),0,
IIF
(ISEMPTY([Measures].[Work PrevWeek]) AND NOT ISEMPTY([Measures].[Work]),2,
IIF
([Measures].[Work PrevWeek] <> [Measures].[Work], 3,1
So 1 is unchanged, 2 is new and 3 is changed. Works pretty neat, with only one glitch: Performance! It takes ages! (If it does finish at all...)
Does anybody know an expression that needs less performance? I have a table in which i derive the type in the report, here it is pretty fast. But I can't really use it for charts and/or grouping etc.
Thanks a lot in advance,
Christof!
(Disclaimer: I've also asked this question on StackOverflow but my experience getting an answer there is not soooo good, so please forgive me!)

Hi Christof_S,
According to your description, there is a calculated field called Deltatype in the report. If Work PrevWeek is null and Work is null, then Deltatype is 0. If Work PrevWeek in null and Work isn’t null, then Deltatype is 2. If Work PrevWeek is the same with
Work, then Deltatype is 1, else 3. The iif function works but the performance is poor.
According to my knowledge, the Iif function returns one of two values depending on whether the expression is true or not. When we have three or more conditions, nested IIF statements will make expression harder to read and extend, instead, we can use Switch
function to get the same functionality. In this case, we can modify the expression like below:
Switch
(ISEMPTY([Measures].[Work PrevWeek]) AND ISEMPTY([Measures].[Work]),0,
ISEMPTY([Measures].[Work PrevWeek]) AND NOT ISEMPTY([Measures].[Work]),2,
[Measures].[Work PrevWeek] <> [Measures].[Work], 3, true, 1)
If you have any more questions, please feel free to ask.
Thanks,
Wendy Fu

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Hi Christof_S,
According to your description, there is a calculated field called Deltatype in the report. If Work PrevWeek is null and Work is null, then Deltatype is 0. If Work PrevWeek in null and Work isn’t null, then Deltatype is 2. If Work PrevWeek is the same with
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Sorry
not fully clear
sounds like this
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Please Mark This As Answer if it solved your issue
Please Mark This As Helpful if it helps to solve your issue
Visakh
My MSDN Page
My Personal Blog
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it works in sql server when i run the query, it assigns the row number to the right person. but when i try to use it in ssrs query, i get
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Please Mark This As Answer if it solved your issue
Please Mark This As Helpful if it helps to solve your issue
Visakh
My MSDN Page
My Personal Blog
My Facebook Page

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Please click "Mark as Answer" if this resolves your problem or "Vote as Helpful" if you find it helpful.

Deltatype in SSRS Query

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