796 search results - page 100 / 160 » A Formalization of ODMG Queries |
156
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PEPM
2010
ACM
16 years 2 months ago
2010
ACM
We show how to efficiently evaluate generic map-filter-product queries, generalizations of select-project-join (SPJ) queries in relational algebra, based on a combination of two...
237
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ICDE
2005
IEEE
16 years 7 months ago
2005
IEEE
The query optimizer of a database system is confronted with two aspects when handling user-defined functions (UDFs) in query predicates: the vast differences in evaluation costs b...
126
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WWW
2008
ACM
16 years 6 months ago
2008
ACM
In this paper, we formalize the problem of Basic Graph Pattern (BGP) optimization for SPARQL queries and main memory graph implementations of RDF data. We define and analyze the c...
182
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PODS
2004
ACM
16 years 6 months ago
2004
ACM
Continuous queries in a Data Stream Management System (DSMS) rely on time as a basis for windows on streams and for defining a consistent semantics for multiple streams and updata...
162
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DEXAW
2007
IEEE
16 years 12 days ago
2007
IEEE
This paper presents an information retrieval methodology which uses Formal Concept Analysis in conjunction with semantics to provide contextual answers to users’ queries. User f...