298 search results - page 21 / 60 » Query Rewriting in DL-Lite_^(HN)_horn |
SIGMOD
1996
ACM
15 years 3 months ago
1996
ACM
Magic sets rewriting is a well-known optimization heuristic for complex decision-support queries. There can be many variants of this rewriting even for a single query, which diffe...
150
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SIGMOD
2008
ACM
15 years 11 months ago
2008
ACM
The emergence of database languages with side effects, notably for XML, raises significant challenges for database compilers and optimizers. In this paper, we extend an algebra fo...
111
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PVLDB
2010
14 years 9 months ago
2010
Supporting legacy applications when the database schema evolves represents a long-standing challenge of practical and theoretical importance. Recent work has produced algorithms a...
AIMS
2007
Springer
15 years 5 months ago
2007
Springer
We describe our effort to evaluate the syntax and constraints of Promise Theory using a tool developed in the Maude framework. Through the development of a Maude module we are able...
147
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ICDT
2009
ACM
15 years 11 months ago
2009
ACM
We study the problem of querying data sources that accept only a limited set of queries, such as sources accessible by Web services which can implement very large (potentially inf...