505 search results - page 26 / 101 » Queries with Incomplete Answers over Semistructured Data |
SIGMOD
2003
ACM
15 years 9 months ago
2003
ACM
We consider an environment where distributed data sources continuously stream updates to a centralized processor that monitors continuous queries over the distributed data. Signif...
EDBT
2006
ACM
15 years 9 months ago
2006
ACM
Abstract. Data stream systems execute a dynamic workload of longrunning and one-time queries, with the streaming inputs typically bounded by sliding windows. For efficiency, window...
AMW
2009
14 years 10 months ago
2009
We investigate the space requirements for summaries needed for maintaining exact answers to aggregate queries over histories of relational databases. We show that, in general, a su...
166
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ICDE
2006
IEEE
15 years 11 months ago
2006
IEEE
We introduce a new domain-independent framework for formulating and efficiently evaluating similarity queries over historical data, where given a history as a sequence of timestam...
109
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IJCAI
2007
14 years 11 months ago
2007
Conjunctive queries play an important role as an expressive query language for Description Logics (DLs). Although modern DLs usually provide for transitive roles, conjunctive quer...