Automated Aggregator - Rewriting with the Counting Aggregate

Algorithms for Rewriting Aggregate Queries Using Views Algorithms for Rewriting Aggregate Queries Using Views Algorithms for Rewriting Aggregate Queries Using Views Algorithms for Rewriting Aggregate Queries Using Views

Queries involving aggregation are typical in database applications. One of the main ideas to optimize the execution of an aggregate query is to reuse results of previously answered queries. This leads to the problem of rewriting aggregate queries using views. Due to a lack of theory, algorithms for this problem were rather ad-hoc. They were sound, but were not proven to be complete. Recently we...

Algorithms for Rewriting Aggregate QueriesUsing

Counting and enumerating aggregate classifiers

We propose a generic model for the “weighted voting” aggregation step performed by several methods in supervised classification. Further, we construct an algorithm to enumerate the number of distinct aggregate classifiers that arise in this model. When there are only two classes in the classification problem, we show that a class of functions that arises from aggregate classifiers coincides wit...

Algorithms for Rewriting Aggregate Queries Using Views

Queries involving aggregation are typical in database applications. One of the main ideas to optimize the execution of an aggregate query is to reuse results of previously answered queries. This leads to the problem of rewriting aggregate queries using views. Due to a lack of theory, algorithms for this problem were rather ad-hoc. They were sound, but were not proven to be complete. Recently we...

Aggregate Query Rewriting in Multidimensional Databases

An efficient query engine is certainly one of the most important components in data warehouses (also known as OLAP systems or multidimensional databases) and its efficiency is influenced by many other aspects, both logical (data model, policy of view materialization, etc.) and physical (multidimensional or relational storage, indexes, etc). As is evident, OLAP queries are often based on the usu...