Dashboard filters is one of the key components of BI Platform that drive reports and KPI’s in various dashboards. MDX expressions to a great extent enables to customize PerformancePoint filters and enhance the end user experience.
First – a quick look at member selection option. Member selection is the easiest way to build dashboard filters which does not require MDX expressions (Screen capture 1). Member selection option allows to select specific members, although this is not usually recommended as the filter can become quite static. A better method is to select Children, Leaves or Descendants with additional option to include or exclude default member. For hierarchies, member selection option also allows selection members from a particular level of hierarchy.
Screen Capture 1 – Member Selection
While member selection option may be sufficient for some business scenarios, using MDX Expressions (Screen Capture 2) enables to customize dashboards without hardcoding the member selection.
Screen Capture 2 – MDX Expression Option for PerformancePoint Filters
Some common and often repeated dashboarding scenarios where MDX expressions for PerformancePoint filters are useful is discussed below
Display only members that have data
It’s not particularly intuitive for business users to select an item from drop down only to find that there is no data for the dashboard to display.
The following example uses FILTER function to select only Product Categories that have a sale.
FILTER([Product].[Category].Children,[Measures].[Internet Order Count] > 0)
Screen Capture 3 – MDX Expression for PerformancePoint Filter
Display only last N time periods
Often business is only keen on trend analysis for the last few years. All time periods from beginning of time need not be displayed in dashboard.
The following MDX expression displays the last 4 fiscal years from current fiscal year. When the fiscal year changes so does the filter data. Note that for this MDX expression to work, the date dimension must have current attributes defined.
(EXISTS([Date].[Fiscal Year].Children,[Date].[Current Fiscal Year].&[Y]).Item(0).LAG(-4) : EXISTS([Date].[Fiscal Year].Children,[Date].[Current Fiscal Year].&[Y]).Item(0))
Display time periods in reverse chronology – latest dates first
Another common requirement for business users is to see the latest dates first.
Using the ORDER function in the previous MDX expression, the latest fiscal years can be displayed as the first item in the drop down.
ORDER((EXISTS([Date].[Fiscal Year].Children,[Date].[Current Fiscal Year].&[Y]).Item(0).LAG(-4) : EXISTS([Date].[Fiscal Year].Children,[Date].[Current Fiscal Year].&[Y]).Item(0)) , [Date].[Fiscal Year].CurrentMember.Properties('key'),DESC)
Hide unknown members
It a good to handle unknown dimension members in datamarts which in turn helps to address data quality issues. However bad data need not be displayed in dashboard filters.
The following MDX expression gets all the Sales Reason members except the unknown members.
([Sales Reason].[Sales Reason].Children -[Sales Reason].[Sales Reason].&[UNAVAILABLE] -[Sales Reason].[Sales Reason].&[NOT APPLICABLE] -[Sales Reason].[Sales Reason].&[UNKNOWN])
The above examples demonstrate the ease with which seriously rocking PerformancePoint filters can be created using simple MDX expressions that create business friendly dashboards.
João Lopes (@SQLSniper) January 15, 2013
Derek Goodridge (@workerthread) January 14, 2013