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» The Complexity of Query Reliability
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ICDT
2003
ACM
139views Database» more  ICDT 2003»
14 years 2 months ago
New Rewritings and Optimizations for Regular Path Queries
All the languages for querying semistructured data and the web use as an integral part regular expressions. Based on practical observations, finding the paths that satisfy those r...
Gösta Grahne, Alex Thomo
KR
2010
Springer
14 years 1 months ago
Query and Predicate Emptiness in Description Logics
Ontologies can be used to provide an enriched vocabulary for the formulation of queries over instance data. We identify query emptiness and predicate emptiness as two central reas...
Franz Baader, Meghyn Bienvenu, Carsten Lutz, Frank...
ADBIS
1998
Springer
100views Database» more  ADBIS 1998»
14 years 1 months ago
Multiple Range Query Optimization in Spatial Databases
In order to answer efficiently range queries in 2-d R-trees, first we sort queries by means of a space filling curve, then we group them together, and finally pass them for process...
Apostolos Papadopoulos, Yannis Manolopoulos
BIRTE
2006
133views Business» more  BIRTE 2006»
14 years 20 days ago
Leveraging Distributed Publish/Subscribe Systems for Scalable Stream Query Processing
Existing distributed publish/subscribe systems (DPSS) offer loosely coupled and easy to deploy content-based stream delivery services to a large number of users. However, the lack ...
Yongluan Zhou, Kian-Lee Tan, Feng Yu
DIS
2006
Springer
14 years 18 days ago
Itemset Support Queries Using Frequent Itemsets and Their Condensed Representations
The purpose of this paper is two-fold: First, we give efficient algorithms for answering itemset support queries for collections of itemsets from various representations of the fre...
Taneli Mielikäinen, Pance Panov, Saso Dzerosk...