1487 search results - page 38 / 298 » Representing and Querying Data Transformations |
110
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PVLDB
2010
14 years 11 months ago
2010
Applications typically have some local understanding of a database schema, a virtual database that may differ significantly from the actual schema of the data where it is stored...
177
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SIGMOD
2008
ACM
16 years 1 months ago
2008
ACM
Uncertain data are inherent in some important applications, such as environmental surveillance, market analysis, and quantitative economics research. Due to the importance of thos...
105
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GLOBE
2009
Springer
15 years 6 months ago
2009
Springer
Abstract. We show how to specify and use the metadata for a virtual and relational data integration system under the local-as-view (LAV) approach. We use XML and RuleML for represe...
IIS
2004
15 years 2 months ago
2004
Estimating the result size of a join is an important query optimization problem as it determines the choice of a good query evaluation strategy. Yet, there are few efficient techni...
DEXA
2004
Springer
15 years 6 months ago
2004
Springer
Data integration is a significant challenge: relevant data objects are split across multiple information sources, and often owned by different organizations. The sources represent...