STORM: a statistical object representation model
SSDBM V Proceedings of the fifth international conference on Statistical and scientific database management
Database abstractions: aggregation and generalization
ACM Transactions on Database Systems (TODS)
Hierarchies and relative operators in the OLAP environment
ACM SIGMOD Record
Proceedings of the twenty-first ACM SIGMOD-SIGACT-SIGART symposium on Principles of database systems
Modeling Multidimensional Databases
ICDE '97 Proceedings of the Thirteenth International Conference on Data Engineering
Data Cube: A Relational Aggregation Operator Generalizing Group-By, Cross-Tab, and Sub-Total
ICDE '96 Proceedings of the Twelfth International Conference on Data Engineering
Summarizability in OLAP and Statistical Data Bases
SSDBM '97 Proceedings of the Ninth International Conference on Scientific and Statistical Database Management
Normal Forms for Multidimensional Databases
SSDBM '98 Proceedings of the 10th International Conference on Scientific and Statistical Database Management
From a Procedural to a Visual Query Language for OLAP
SSDBM '98 Proceedings of the 10th International Conference on Scientific and Statistical Database Management
Multidimensional Data Modeling for Complex Data
ICDE '99 Proceedings of the 15th International Conference on Data Engineering
Representing spatiality in a conceptual multidimensional model
Proceedings of the 12th annual ACM international workshop on Geographic information systems
Hierarchies in a multidimensional model: from conceptual modeling to logical representation
Data & Knowledge Engineering - Special issue: WIDM 2004
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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.