71 search results - page 3 / 15 » RankSQL: Query Algebra and Optimization for Relational Top-k... |
VLDB
1987
ACM
15 years 1 months ago
1987
ACM
A Datalog program can be translated into a system of fixpoint equations of relational algebra; this paper studies how such a system can be solved and optimized for a particular qu...
ICTIR
2009
Springer
14 years 7 months ago
2009
Springer
Abstract. A useful ability for search engines is to be able to rank objects with novelty and diversity: the top k documents retrieved should cover possible interpretations of a que...
185
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ICDE
2007
IEEE
15 years 11 months ago
2007
IEEE
Linear optimization queries retrieve the top-K tuples in a sliding window of a data stream that maximize/minimize the linearly weighted sums of certain attribute values. To effici...
181
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ICDE
2003
IEEE
15 years 11 months ago
2003
IEEE
XKeyword provides efficient keyword proximity queries on large XML graph databases. A query is simply a list of keywords and does not require any schema or query language knowledg...
177
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ICDE
2008
IEEE
15 years 11 months ago
2008
IEEE
This paper introduces U-relations, a succinct and purely relational representation system for uncertain databases. U-relations support attribute-level uncertainty using vertical pa...