721 search results - page 51 / 145 » Supporting top-k join queries in relational databases |
OWLED
2008
14 years 11 months ago
2008
We study conjunctive query answering in the description logic EL, the core of the designated OWL2-EL profile of OWL2. In particular, we present an approach that allows the use of c...
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SIGMOD
2007
ACM
15 years 10 months ago
2007
ACM
Map-Reduce is a programming model that enables easy development of scalable parallel applications to process vast amounts of data on large clusters of commodity machines. Through ...
PVLDB
2008
14 years 9 months ago
2008
Recently, a number of papers have been published showing the benefits of column stores over row stores. However, the research comparing the two in an "apples-to-apples" ...
ICDE
2010
IEEE
15 years 2 months ago
2010
IEEE
— When a database system is extended with the skyline operator, it is important to determine the most efficient way to execute a skyline query across tables with join operations...
SSDBM
2008
IEEE
15 years 4 months ago
2008
IEEE
Random sampling is a popular technique for providing fast approximate query answers, especially in data warehouse environments. Compared to other types of synopses, random sampling...