208 search results - page 21 / 42 » Efficient Computation of Multiple Group By Queries |
CHI
2004
ACM
14 years 8 months ago
2004
ACM
Most information retrieval (IR) interfaces are designed for a single user working with a dedicated interface. We present a system in which the IR interface has been fully integrat...
ISPAN
2008
IEEE
14 years 2 months ago
2008
IEEE
- Many peer-to-peer file sharing systems have been proposed to take the locality and heterogeneity into account. The two-layered architecture is one of the most widespread systems ...
IDEAS
2000
IEEE
14 years 10 hour ago
2000
IEEE
Most operations of the relational algebra or SQL - like projection with duplicate elimination, join, ordering, group by and aggregations - are efficiently processed using a sorted...
SIGMOD
2003
ACM
14 years 7 months ago
2003
ACM
We propose a framework for integrating data from multiple relational sources into an XML document that both conforms to a given DTD and satisfies predefined XML constraints. The f...
VLDB
2007
ACM
14 years 7 months ago
2007
ACM
Estimating the cardinality (i.e. number of distinct elements) of an arbitrary set expression defined over multiple distributed streams is one of the most fundamental queries of in...