750 search results - page 88 / 150 » Aggregates in Possibilistic Databases |
VLDB
1990
ACM
14 years 2 months ago
1990
ACM
In this paper, we describe a new indexing technique, the time indez, for improving the performance of certain classes of temporal queries. The time index can be used to retrieve v...
DEXAW
2004
IEEE
14 years 1 months ago
2004
IEEE
Database-like query processing over a network of sensors has become an attractive paradigm for building sensor applications. A sensor query is characterized by data streams among ...
VLDB
1995
ACM
14 years 1 months ago
1995
ACM
We address the problem of finding parallel plans for SQL queries using the two-phase approach of join ordering and query rewrite (JOQR) followed by parallelization. We focus on t...
DBPL
2005
Springer
13 years 12 months ago
2005
Springer
XQuery is known to be a powerful XML query language with many bells and whistles. For many common queries we do not need all the expressive power of XQuery. We investigate the eff...
DEXA
2008
Springer
13 years 11 months ago
2008
Springer
In this paper, we present an OLAP framework for trajectories of moving objects. We introduce a new operator GROUP TRAJECTORIES for group-by operations on trajectories and present ...