2063 search results - page 8 / 413 » Containment of Aggregate Queries |
ICDT
2007
ACM
14 years 1 months ago
2007
ACM
Abstract. We study containment of conjunctive queries that are evaluated over databases that may contain tuples with null values. We assume the semantics of SQL for single block qu...
SEBD
2007
13 years 8 months ago
2007
We consider the problem of query containment over an object data model derived from F-logic. F-logic has generated considerable interest commercially, in the academia, and within ...
SIGIR
1996
ACM
13 years 11 months ago
1996
ACM
The aggregated structure of documents plays a key role in full-text, multimedia, and network Information Retrieval (IR). Considering aggregation provides new querying facilities a...
PVLDB
2010
13 years 2 months ago
2010
A RkNN query returns all objects whose nearest k neighbors contain the query object. In this paper, we consider RkNN query processing in the case where the distances between attri...
SIGMOD
2004
ACM
14 years 7 months ago
2004
ACM
