204 search results - page 17 / 41 » Containment of Conjunctive Queries with Negation: Algorithms... |
GIS
1999
ACM
14 years 10 hour ago
1999
ACM
Spatial indexes, such as the PMR quadtree, are important in spatial databases for efficient execution of queries involving spatial constraints, especially when the queries involv...
TSC
2010
13 years 2 months ago
2010
Data-Providing (DP) services allow query-like access to organizations' data via web services. The invocation of a DP service results in the execution of a query over data sour...
SIGMOD
2010
ACM
13 years 6 months ago
2010
ACM
Given a graph database D and a query graph g, an exact subgraph matching query asks for the set S of graphs in D that contain g as a subgraph. This type of queries find important...
DASFAA
2010
IEEE
14 years 26 days ago
2010
IEEE
Given a set of query points, a dynamic skyline query reports all data points that are not dominated by other data points according to the distances between data points and query po...
ICDE
2011
IEEE
12 years 11 months ago
2011
IEEE
—An important facility to aid keyword search on XML data is suggesting alternative queries when user queries contain typographical errors. Query suggestion thus can improve users...