2063 search results - page 221 / 413 » Containment of Aggregate Queries |
242
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ICDE
1997
IEEE
16 years 7 months ago
1997
IEEE
Query optimization is an integral part of relational database management systems. One important task in query optimization is selectivity estimation, that is, given a query P, we ...
264
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SIGMOD
2009
ACM
16 years 6 months ago
2009
ACM
With the proliferation of the RDF data format, engines for RDF query processing are faced with very large graphs that contain hundreds of millions of RDF triples. This paper addre...
234
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SIGMOD
2007
ACM
16 years 5 months ago
2007
ACM
Accurate cardinality estimation is critically important to high-quality query optimization. It is well known that conventional cardinality estimation based on histograms or simila...
204
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SIGMOD
2003
ACM
16 years 5 months ago
2003
ACM
We consider the problem of efficiently producing ranked results for keyword search queries over hyperlinked XML documents. Evaluating keyword search queries over hierarchical XML ...
132
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WALCOM
2010
IEEE
16 years 22 days ago
2010
IEEE
We address a version of the set-cover problem where we do not know the sets initially (and hence referred to as covert) but we can query an element to find out which sets contain ...