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TopSum (MDX)

  • Artykuł

Sorts a set and returns the topmost elements whose cumulative total is at least a specified value.

Syntax

TopSum(Set_Expression, Value, Numeric_Expression)

Arguments

  • Set_Expression
    A valid Multidimensional Expressions (MDX) expression that returns a set.
  • Value
    A valid numeric expression that specifies the value against which each tuple is compared.
  • Numeric_Expression
    A valid numeric expression that is typically a Multidimensional Expressions (MDX) expression that returns a measure.

Remarks

The TopSum function calculates the sum of a specified measure evaluated over a specified set, sorting the set in descending order. The function then returns the elements with the highest values whose total of the specified numeric expression is at least the specified value. This function returns the smallest subset of a set whose cumulative total is at least the specified value. The returned elements are ordered largest to smallest.

Important

Like the BottomSum function, the TopSum function always breaks the hierarchy.

Example

The following example returns, for the Bike category, the smallest set of members of the City level in the Geography hierarchy in the Geography dimension for fiscal year 2003 whose cumulative total using the Reseller Sales Amount measure is at least the sum of 5,000,000 (beginning with the members of this set with the largest number of sales).

SELECT TopSum
   ({[Geography].[Geography].[City].Members 
      *[Date].[Fiscal].[Fiscal Year].[FY 2003]}
   , 5000000
   , [Measures].[Reseller Sales Amount]
   ) ON 0,
   [Product].[Product Categories].Bikes ON 1
FROM [Adventure Works]

See Also

Reference

MDX Function Reference (MDX)

Help and Information

Getting SQL Server 2005 Assistance

Change History

Release History

17 July 2006
Changed content:
  • Updated syntax and arguments to improve clarity.
  • Added updated examples.