383 search results - page 52 / 77 » Query Containment for Conjunctive Queries with Regular Expre... |
SIGMOD
2005
ACM
14 years 2 months ago
2005
ACM
Appropriately selected materialized views (also called indexed views) can speed up query execution by orders of magnitude. Most database systems limit support for materialized vie...
BDA
2006
13 years 10 months ago
2006
We consider a publish/subscribe system for digital libraries which continuously evaluates queries over a large repository containing document descriptions. The subscriptions, the ...
PODS
2007
ACM
14 years 8 months ago
2007
ACM
We show that relational algebra calculations for incomplete databases, probabilistic databases, bag semantics and whyprovenance are particular cases of the same general algorithms...
VLDB
1995
ACM
14 years 6 days ago
1995
ACM
Scientific data of importance to biologists in the Humitn Genome Project resides not only in conventional da.tabases, but in structured files maintained in a number of different f...
ENTCS
2006
13 years 8 months ago
2006
Context and sequence variables allow matching to explore term-trees both in depth and in breadth. It makes context sequence matching a suitable computational mechanism for a rule-...