518 search results - page 57 / 104 » Querying XML Views of Relational Data |
196
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SIGMOD
2006
ACM
15 years 12 months ago
2006
ACM
This paper introduces the Tuple Graph (TuG) synopses, a new class of data summaries that enable accurate selectivity estimates for complex relational queries. The proposed summari...
IDEAS
2007
IEEE
15 years 6 months ago
2007
IEEE
In this paper we study the problem of deciding whether a regular path query over views in data-integration systems can be re-expressed without recursion. The problem becomes chall...
DAWAK
1999
Springer
15 years 4 months ago
1999
Springer
A Data Warehouse DW can be abstractly seen as a set of materialized views de ned over relations that are stored in distributed heterogeneous databases. The selection of views for...
119
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SIGMOD
1999
ACM
15 years 4 months ago
1999
ACM
Systems for managing and querying semistructured-data sources often store data in proprietary object repositories or in a tagged-text format. We describe a technique that can use ...
118
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CACM
1998
14 years 11 months ago
1998
abstraction for modeling these problems is to view the Web as a collection of (usually small and heterogeneous) databases, and to view programs that extract and process Web data au...