1238 search results - page 47 / 248 » View-based query containment |
107
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FCT
2001
Springer
15 years 7 months ago
2001
Springer
This paper presents the prediction-preserving reducibility with membership queries (pwm-reducibility) on formal languages, in particular, simple CFGs and finite unions of regular ...
110
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EUROPAR
2000
Springer
15 years 6 months ago
2000
Springer
Tertiary storage systems are used when secondary storage can not satisfy the data storage requirements and/or it is a more cost effective option. The new application domains requir...
127
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KDD
2004
ACM
16 years 3 months ago
2004
ACM
In this paper we provide a fast, data-driven solution to the failing query problem: given a query that returns an empty answer, how can one relax the query's constraints so t...
216
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SIGMOD
2007
ACM
16 years 3 months ago
2007
ACM
Complex queries often contain common or similar subexpressions, either within a single query or among multiple queries submitted as a batch. If so, query execution time can be imp...
119
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WWW
2010
ACM
15 years 10 months ago
2010
ACM
In this paper, we address the problem of database selection for XML document collections, that is, given a set of collections and a user query, how to rank the collections based o...