With this operator, proposed in Pedersen, Jensen, & Dyreson (2001), we can remove "duplicate values," i.e., several facts characterized by the same combination of dimension values, by performing a set-count aggregate formation on the categories, followed by projecting out the result dimension, where is the bottom ordering category of the hierarchy.

Multidimensional Databases(c) Problems and Solutions
Multidimensional Databases: Problems and Solutions
ISBN: 1591400538
EAN: 2147483647
Year: 2003
Pages: 150

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