6974 search results - page 67 / 1395 » Querying Semi-Structured Data |
PODS
2002
ACM
14 years 8 months ago
2002
ACM
We consider conjunctive queries with arithmetic comparisons over multiple continuous data streams. We specify an algorithm for determining whether or not a query can be evaluated ...
PODS
1993
ACM
13 years 12 months ago
1993
ACM
In this paper, we motivate four di erent user de ned window query classes and derive a probabilistic model for each of them. For each model, we characterize the e ciency of spatia...
VLDB
2005
ACM
14 years 1 months ago
2005
ACM
Query optimizers in current database systems are designed to pick a single efficient plan for a given query based on current statistical properties of the data. However, different...
VLDB
1999
ACM
14 years 4 days ago
1999
ACM
While the desire to support fast, ad hoc query processing for large data warehouses has motivated the
SECON
2008
IEEE
14 years 2 months ago
2008
IEEE
Sensor networks will shortly consist of globally deployed sensors providing real-time geo-centric information to users. Particularly, users with mobile devices will issue ad-hoc q...