Infinite Drill-through in a single SSRS report

Grant Paisley of Angry Koala and Report Surfer put me onto this a while back, and I have to admit I’m a bit of a fan. The idea comes from the fact the way that SQL Server Reporting Services (both 2005 and 2008) handles parameters with Analysis Services, and lets you make a report that drills through into itself, deeper and deeper into a hierarchy. Today I did a talk at the Adelaide SQL Server User Group, and mentioned this was possible (but didn’t have the time to demonstrate it properly).

If you make a parameterized query in an MDX query in SSRS, you use the STRTOMEMBER or STRTOSET function to handle this. But the MDX has no other indication of what dimension, hierarchy or level is being passed in. If you grab the children of whatever you’ve passed in, you can easily put this on the Rows axis and get one level down. Passing the UniqueName of whatever you’ve just provided back in as the next parameter, and you have infinite drill-through.

Look at the following MDX query:

WITH
MEMBER [Measures].[NextLevel] as StrToMember(@SomeDate).Hierarchy.CurrentMember.UniqueName
MEMBER [Measures].[NextLevel Name] as StrToMember(@SomeDate).Hierarchy.CurrentMember.Member_Name

SELECT
NON EMPTY { [Measures].[Internet Sales Amount], [Measures.NextLevel], [Measures].[NextLevel Name] } ON COLUMNS,
NON EMPTY { (StrToMember(@SomeDate).Children ) } ON ROWS

FROM [Adventure Works]

You see that I provide the UniqueName and Member_Name properties in known columns, so that I can easily reference them in my report. You’ll also notice that nowhere do I actually indicate which dimension I’m planning to drill down on, or to which hierarchy the @SomeDate parameter refers. I have suggested it’s a date, but only in name. At this point I also make sure that the Report Parameter is not restricted to values from a particular query, and I hide it from the user. I’m going to be passing in UniqueName values, which aren’t particular user-friendly.

If I start with [Date].[Fiscal].[Fiscal Year].&[2003], then my NextLevels will be [Date].[Fiscal].[Fiscal Semester].&[2003]&[1] and [Date].[Fiscal].[Fiscal Semester].&[2003]&[2]. This then continues down as far as I want it to go. I could always put a condition on my Action to pick up when there are no more levels, and potentially start down a different hierarchy. After all, I can always use a bunch of other parameters in the WHERE clause to slice the cube in other ways first, for placeholders. It really just comes down to MDX creativity to investigate different ways of drilling through the data.

Please bear in mind that other people may well have achieved the same sort of thing using a different query – I’m just posting what has worked for me. Hopefully by doing this, you can avoid making five drill-through reports just because your hierarchy has five levels. This might just remove 80% of your reporting effort!

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