293 search results - page 17 / 59 » Efficiently Querying Relational Databases Using OWL and SWRL |
VLDB
1989
ACM
15 years 3 months ago
1989
ACM
In this paper. we utilize intervals for unknown values in incompleterelational databases.We usetablesto representunknown relations. First, we define three partial tuple types in a...
WWW
2001
ACM
16 years 9 days ago
2001
ACM
A wealth of information is available on the Web. But often, such data are hidden behind form interfaces which allow only a restrictive set of queries over the underlying databases...
113
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ER
2008
Springer
15 years 1 months ago
2008
Springer
Abstract. Data in many industrial application systems are often neither completely structured nor unstructured. Consequently semi-structured data models such as XML have become pop...
SIGMOD
2001
ACM
15 years 11 months ago
2001
ACM
Estimating the result size of complex queries that involve selection on multiple attributes and the join of several relations is a difficult but fundamental task in database query...
190
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ICDE
1998
IEEE
16 years 1 months ago
1998
IEEE
Discovery of functionaldependencies from relations has been identified as an important database analysis technique. In this paper, we present a new approach for finding functional...