TOPSUM (MDX)
Returned Type
This function returns a set of members or tuples, depending on the set used.
Syntax and Details
TOPSUM(set_expression, cutoff_value, ordering_expression)
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set_expression is an expression that evaluates to a set of members or tuples.
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cutoff_value is a numeric literal.
The function uses this argument to determine the cutoff value for elements to return in the subset.
For all elements in the returned subset, the sum of the values of ordering_expression will be less than or equal to cutoff_value.
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ordering_expression is a numeric-valued expression that determines the order of the set members.
The function evaluates this expression for each element of the set and sorts the elements of the set in descending order according to this value. Any hierarchies are ignored.
Example
First consider an example in which the cutoff value is high enough to include all members:
SELECT MEASURES.[%COUNT] ON 0,
TOPSUM(birthd.decade.MEMBERS, 10000, MEASURES.[%COUNT]) ON 1 FROM patients
Patient Count
1 1970s 1,520
2 1960s 1,500
3 2000s 1,433
4 1990s 1,413
5 1980s 1,400
6 1950s 1,030
7 1940s 683
8 1930s 572
9 1920s 223
10 2010s 155
11 1910s 71
Now consider a variation in which the cutoff value is set to 2500:
SELECT MEASURES.[%COUNT] ON 0,
TOPSUM(birthd.decade.MEMBERS, 2500, MEASURES.[%COUNT]) ON 1 FROM patients
Patient Count
1970s 1,520
