298 search results - page 46 / 60 » Query Rewriting in DL-Lite_^(HN)_horn |
153
Voted
SIGMOD
2006
ACM
15 years 11 months ago
2006
ACM
Consider an XML view defined over a relational database, and a user query specified over this view. This user XML query is typically processed using the following steps: (a) our t...
102
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SIGMOD
2005
ACM
15 years 4 months ago
2005
ACM
One of the most powerful features of SQL is the use of nested queries. Most research work on the optimization of nested queries focuses on aggregate subqueries. However, the solut...
EDBT
2009
ACM
15 years 3 months ago
2009
ACM
Data provenance is essential in applications such as scientific computing, curated databases, and data warehouses. Several systems have been developed that provide provenance fun...
DAWAK
1999
Springer
15 years 3 months ago
1999
Springer
A data warehouse DW can be seen as a set of materialized views de ned over remote base relations. When a query is posed, it is evaluated locally, using the materialized views, wi...
108
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JODS
2006
14 years 11 months ago
2006
While providing a uniform syntax and a semistructured data model, XML does not express semantics but only structure such as nesting information. In this paper, we consider the prob...