Filter (MDX)
Returns the set that results from filtering a specified set based on a search condition.
Syntax
Filter(Set_Expression, Logical_Expression )
Arguments
Set_Expression
A valid Multidimensional Expressions (MDX) expression that returns a set.
Logical_Expression
A valid Multidimensional Expressions (MDX) logical expression that evaluates to true or false.
Remarks
The Filter function evaluates the specified logical expression against each tuple in the specified set. The function returns a set that consists of each tuple in the specified set where the logical expression evaluates to true. If no tuples evaluate to true, an empty set is returned.
The Filter function works in a fashion similar to that of the IIf function. The IIf function returns only one of two options based on the evaluation of an MDX logical expression, while the Filter function returns a set of tuples that meet the specified search condition. In effect, the Filter function executes IIf(Logical_Expression, Set_Expression.Current, NULL) on each tuple in the set, and returns the resulting set.
Examples
The following example shows the use of the Filter function on the Rows axis of a query, to return only the Dates where Internet Sales Amount is greater than $10000:
SELECT [Measures].[Internet Sales Amount] ON 0,
FILTER(
[Date].[Date].[Date].MEMBERS
, [Measures].[Internet Sales Amount]>10000)
ON 1
FROM
[Adventure Works]
The Filter function can also be using inside calculated member definitions. The following example returns the sum of the Measures.[Order Quantity] member, aggregated over the first nine months of 2003 contained in the Date dimension, from the Adventure Works cube. The PeriodsToDate function defines the tuples in the set over which the Aggregate function operates. The Filter function limits those tuples being returned to those with lower values for the Reseller Sales Amount measure for the previous time period.
WITH MEMBER Measures.[Declining Reseller Sales] AS Count
(Filter
(Existing
(Reseller.Reseller.Reseller),
[Measures].[Reseller Sales Amount] <
([Measures].[Reseller Sales Amount],[Date].Calendar.PrevMember)
)
)
MEMBER [Geography].[State-Province].x AS Aggregate
( {[Geography].[State-Province].&[WA]&[US],
[Geography].[State-Province].&[OR]&[US] }
)
SELECT NON EMPTY HIERARCHIZE
(AddCalculatedMembers
({DrillDownLevel
({[Product].[All Products]})}
)
) DIMENSION PROPERTIES PARENT_UNIQUE_NAME ON COLUMNS
FROM [Adventure Works]
WHERE ([Geography].[State-Province].x,
[Date].[Calendar].[Calendar Quarter].&[2003]&[4],
[Measures].[Declining Reseller Sales])