189 search results - page 22 / 38 » Translating and Optimizing SQL Queries Having Aggregates |
SIGMOD
1993
ACM
13 years 11 months ago
1993
ACM
The traditional focus of relational query optimization schemes has been on the choice of join methods and join orders. Restrictions have typically been handled in query optimizers ...
SIGMOD
2008
ACM
14 years 7 months ago
2008
ACM
Today's query processing engines do not take advantage of the multiple occurrences of a relation in a query to improve performance. Instead, each instance is treated as a dis...
SSDBM
2008
IEEE
14 years 2 months ago
2008
IEEE
Applications requiring the handling of uncertain data have led to the development of database management systems extending the scope of relational databases to include uncertain (p...
ICDE
2007
IEEE
14 years 9 months ago
2007
IEEE
Algorithms that exploit sort orders are widely used to implement joins, grouping, duplicate elimination and other set operations. Query optimizers traditionally deal with sort ord...
SIGMOD
2006
ACM
14 years 7 months ago
2006
ACM
The current SQL standard for access control is coarse grained, in that it grants access to all rows of a table or none. Fine-grained access control, which allows control of access...