147 search results - page 7 / 30 » Size Bounds and Query Plans for Relational Joins |
ICDE
2008
IEEE
14 years 8 months ago
2008
IEEE
This paper introduces U-relations, a succinct and purely relational representation system for uncertain databases. U-relations support attribute-level uncertainty using vertical pa...
PVLDB
2010
13 years 5 months ago
2010
Optimization of join queries based on average selectivities is suboptimal in highly correlated databases. In such databases, relations are naturally divided into partitions, each ...
DEXA
2006
Springer
13 years 9 months ago
2006
Springer
Geographic information systems (GIS) must support large georeferenced data sets. Due to the size of these data sets finding exact answers to spatial queries can be very time consum...
SIGMOD
2005
ACM
14 years 7 months ago
2005
ACM
One of the most common operations in analytic query processing is the application of an aggregate function to the result of a relational join. We describe an algorithm for computi...
ICDE
2002
IEEE
14 years 8 months ago
2002
IEEE
XML queries typically specify patterns of selection predicates on multiple elements that have some specified tree structured relationships. The primitive tree structured relations...