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This article studies optimizing top- k queries in middlewares. While many assorted algorithms have been proposed, none is generally applicable to a wide range of possible scenarios. Existing algorithms lack both the “generality” to support a wide range of access scenarios and the systematic...
Node-selecting queries over trees lie at the core of several important XML languages for the web, such as the node-selection language XPath, the query language XQuery, and the transformation language XSLT. The main syntactic constructs of such queries are the backward predicates, for example,...
A variety of techniques for performing a spatial join are reviewed. Instead of just summarizing the literature and presenting each technique in its entirety, distinct components of the different techniques are described and each is decomposed into an overall framework for performing a spatial...
Given an OLAP query expressed over multiple source OLAP databases, we study the problem of estimating the resulting OLAP target database. The problem arises when it is not possible to derive the result from a single database. The method we use is linear indirect estimation, commonly used for...
In this article, we introduce pesudoconstraints , a novel data mining pattern aimed at identifying rare events in databases. At first, we formally define pesudoconstraints using a probabilistic model and provide a statistical test to identify pesudoconstraints in a database. Then, we focus on a...
This editorial analyzes from a variety of perspectives the controversial issue of single-blind versus double-blind reviewing. In single-blind reviewing, the reviewer is unknown to the author, but the identity of the author is known to the reviewer. Double-blind reviewing is more symmetric: The...
Composition of mappings between schemas is essential to support schema evolution, data exchange, data integration, and other data management tasks. In many applications, mappings are given by embedded dependencies. In this article, we study the issues involved in composing such mappings. Our...
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