113 search results - page 7 / 23 » The containment problem for REAL conjunctive queries with in... |
ICDE
2010
IEEE
14 years 8 months ago
2010
IEEE
A supergraph containment search is to retrieve the data graphs contained by a query graph. In this paper, we study the problem of efficiently retrieving all data graphs approximate...
AMW
2009
13 years 9 months ago
2009
In data exchange, data are materialised from a source schema to a target schema, according to suitable source-to-target constraints. Constraints are also expressed on the target sc...
EDBT
2006
ACM
14 years 8 months ago
2006
ACM
Current methods for selectivity estimation fall into two broad categories, synopsis-based and sampling-based. Synopsis-based methods, such as histograms, incur minimal overhead at ...
PODS
2003
ACM
14 years 8 months ago
2003
ACM
In this paper we study the following problem. Given a database and a set of queries, we want to find, in advance, a set of views that can compute the answers to the queries, such ...
NLDB
2007
Springer
14 years 2 months ago
2007
Springer
Abstract. Requirements engineering, the first phase of any software development project, is the Achilles’ heel of the whole development process, as requirements documents are of...