651 search results - page 57 / 131 » Algebraic Query Optimization for Distributed Top-k Queries |
FOCS
2008
IEEE
14 years 3 months ago
2008
IEEE
Relational joins are at the core of relational algebra, which in turn is the core of the standard database query language SQL. As their evaluation is expensive and very often domi...
ICDT
1995
ACM
14 years 19 days ago
1995
ACM
A tuple t1 of relation R subsumes tuple t2 of R, with respect to a query Q if for every database, tuple t1 derives all, and possibly more, answers to query Q than derived by tuple ...
SIGMOD
2001
ACM
14 years 9 months ago
2001
ACM
Estimating the result size of complex queries that involve selection on multiple attributes and the join of several relations is a difficult but fundamental task in database query...
SEDE
2010
13 years 7 months ago
2010
Enterprise-level applications are becoming complex with the need for event and stream processing, multiple query processing and data analysis over heterogeneous data sources such ...
ICDCS
2005
IEEE
14 years 2 months ago
2005
IEEE
Database queries, in particular, event-driven continuous queries, are useful for many pervasive computing applications, such as video surveillance. In order to enable these applic...