Hierarchies

Hierarchies

Elaheh Pourabbas (Istituto di Analisi dei Sistemi ed Informatica - C. N. R., Italy) and Maurizio Rafanelli (Istituto di Analisi dei Sistemi ed Informatica - C. N. R., Italy)
Copyright: © 2003 |Pages: 25
DOI: 10.4018/978-1-59140-053-0.ch004
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Abstract

In this chapter we will focus on the rules of aggregation hierarchies in analysis dimensions of a cube. We give an overview of the related works on the basic concepts of the different types of aggregation hierarchies. We then discuss the hierarchies from two different points of view: mapping between domain values and hierarchical structures. In relation to them, we introduce the characterization of some OLAP operators on hierarchies and give a set of operators that concern the change in the hierarchy structure. Finally, we propose an enlargement of the operator set concerning hierarchies.

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