6846 search results - page 284 / 1370 » Querying a summary of database |
174
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ADC
2006
Springer
15 years 10 months ago
2006
Springer
XML-based databases have become a major area of in database research. Abstractly speaking they can be considered as a resurrection of complexvalue databases using constructors for...
262
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SIGMOD
2005
ACM
16 years 6 months ago
2005
ACM
Window queries are proving essential to data-stream processing. In this paper, we present an approach for evaluating sliding-window aggregate queries that reduces both space and c...
134
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SIGMOD
1997
ACM
15 years 10 months ago
1997
ACM
In this paper, we study a simple SQL extension that enables query writers to explicitly limit the cardinality of a query result. We examine its impact on the query optimization an...
198
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DEXA
2008
Springer
15 years 8 months ago
2008
Springer
In professional environments which are characterized by a domain (Medicine, Law, etc.), information retrieval systems must be able to process precise queries, mostly because of the...
178
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SIGMOD
2011
ACM
14 years 9 months ago
2011
ACM
In this paper, we introduce U-MAP, a new system for schema mapping generation. U-MAP builds upon and extends existing schema mapping techniques. However, it mitigates some key pro...