204 search results - page 5 / 41 » Containment of Conjunctive Queries with Negation: Algorithms... |
105
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ICDT
2001
ACM
15 years 4 months ago
2001
ACM
In information-integration systems, source relations often have limitations on access patterns to their data; i.e., when one must provide values for certain attributes of a relatio...
ACL
1997
15 years 28 days ago
1997
We identify and validate from a large corpus constraints from conjunctions on the positive or negative semantic orientation of the conjoined adjectives. A log-linear regression mo...
115
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ICDT
2012
ACM
13 years 2 months ago
2012
ACM
A universal model of a database D and a set Σ of integrity constraints is a database that extends D, satisfies Σ, and is most general in the sense that it contains sound and co...
204
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SIGIR
2012
ACM
13 years 2 months ago
2012
ACM
People are seldom aware that their search queries frequently mismatch a majority of the relevant documents. This may not be a big problem for topics with a large and diverse set o...
KDD
2005
ACM
16 years 2 hour ago
2005
ACM
We present an algorithm for mining tree-shaped patterns in a large graph. Novel about our class of patterns is that they can contain constants, and can contain existential nodes w...