Extract (MDX)
Returns a set of tuples from extracted hierarchy elements.
Syntax
Extract(Set_Expression, Hierarchy_Expression1 [,Hierarchy_Expression2, ...n] )
Arguments
Set_Expression
A valid Multidimensional Expressions (MDX) expression that returns a set.Hierarchy_Expression1
A valid Multidimensional Expressions (MDX) expression that returns a hierarchy.Hierarchy_Expression2
A valid Multidimensional Expressions (MDX) expression that returns a hierarchy.
Remarks
The Extract function returns a set that consists of tuples from the extracted hierarchy elements. For each tuple in the specified set, the members of the specified hierarchies are extracted into new tuples in the result set. This function always removes duplicate tuples.
The Extract function performs the opposite action of the Crossjoin function.
Examples
The following query shows how to use the Extract function on a set of tuples returned by the NonEmpty function:
SELECT [Measures].[Internet Sales Amount] ON 0,
//Returns the distinct combinations of Customer and Date for all purchases
//of Bike Racks or Bike Stands
EXTRACT(
NONEMPTY(
[Customer].[Customer].[Customer].MEMBERS
*
[Date].[Date].[Date].MEMBERS
*
{[Product].[Product Categories].[Subcategory].&[26],[Product].[Product Categories].[Subcategory].&[27]}
*
{[Measures].[Internet Sales Amount]}
)
, [Customer].[Customer], [Date].[Date])
ON 1
FROM [Adventure Works]