1238 search results - page 71 / 248 » View-based query containment |
SIGMOD
2004
ACM
15 years 10 months ago
2004
ACM
Current day database applications, with large numbers of users, require fine-grained access control mechanisms, at the level of individual tuples, not just entire relations/views,...
SIGMOD
2003
ACM
15 years 10 months ago
2003
ACM
XML databases often contain documents comprising structured text. Therefore, it is important to integrate "information retrieval style" query evaluation, which is well-s...
SIGMOD
2010
ACM
15 years 2 months ago
2010
ACM
We propose a novel privacy-preserving distributed infrastructure in which data resides only with the publishers owning it. The infrastructure disseminates user queries to publishe...
ADBIS
2000
Springer
15 years 2 months ago
2000
Springer
We consider queries which originate from a mobile unit and whose result depends on the location of the user who initiates the query. Example of such a query is How many people are ...
COCO
1989
Springer
15 years 1 months ago
1989
Springer
Kadin [6] showed that if the Polynomial Hierarchy (PH) has infinitely many levels, then for all k, PSAT[k] ⊂ PSAT[k+1]. This paper extends Kadin’s technique and shows that a p...