103 search results - page 3 / 21 » Views and queries: determinacy and rewriting |
WAIM
2009
Springer
13 years 12 months ago
2009
Springer
Contained rewriting and maximal contained rewriting of tree pattern queries using views have been studied recently for the class of tree patterns involving /, //, and []. Given que...
PODS
2003
ACM
14 years 5 months ago
2003
ACM
In this paper we consider general path constraints for semistructured databases. Our general constraints do not suffer from the limitations of the path constraints previously stud...
ICDE
2007
IEEE
14 years 6 months ago
2007
IEEE
We study the problem of answering queries posed on virtual views of XML documents, a problem commonly encountered when enforcing XML access control and integrating data. We approa...
SIGMOD
2001
ACM
14 years 5 months ago
2001
ACM
We study the problem of generating e cient, equivalent rewritings using views to compute the answer to a query. We take the closed-world assumption, in which views are materialize...
ADBIS
2000
Springer
13 years 9 months ago
2000
Springer
Queries involving aggregation are typical in a number of database research areas, such as data warehousing, global information systems and mobile computing. One of the main ideas ...