Enabling our clients reporting self-service

Question

SharePoint 2013 Enterprise.
We create sites for each of our clients.  On these sites we have various canned SSRS reports with parameters where customer can get on-demand output.  But there is always a need for Client to ask for report with columns that aren't on the reports.
The data model behind these reports is relatively simple and can be expressed in one view. The problem is that there are A LOT of columns.  There are 56 dimensional columns, and nearly 146 measures (or 146 columns in the Fact table)... capturing the
various component costs of parcel and freight shipping.  So the one view has nearly 200 columns.
The reports our customers want to run can generate output in the 10,000s to x00,000s rows of data.
So we need something that can generate a dynamic SELECT column listing and a dynamic WHERE clause.
What in SharePoint can allow this? I've tried using Reporting Services but the parameter ui is not suitable for this. The Reporting Service also takes a long time the bigger the output is, naturally.  I looked at Power View, but Power View does
not have an easy Export function and in any case, our data would not fit in memory for tabular analysis.
I'm thinking I have to create something akin to the Report Services Report Wizard with the two large text boxes with the add remove buttons between them with the column listing on the left side.  And then somehow find a way to capture their WHERE requirements.
Anyone steer me in a direction to go?

Answer 1

Hi Vince,
According to  your description, my understanding is that you want to dynamically specify columns of a SharePoint list as SSRS report data source.
For achieving your demand, you need to use XML data source. The XML content can be embedded directly within the query. This lets you use the expression capabilities within the processing engine to build queries
and data dynamically within the report. And it can be used for retrieving XML data directly from an external data source, passing it using parameters, and embedding it within the query.
Reference:
http://social.msdn.microsoft.com/Forums/sqlserver/en-US/77285ab4-e2b8-4c38-8421-5aa49c9c8a36/how-to-select-column-dynamically-with-sharepoint-list-as-data-source-in-ssrs-report?forum=sqlreportingservices
Thanks,
Eric
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