251 search results - page 1 / 51 » Rewriting Aggregate Queries using Description Logic |
DLOG
2003
14 years 16 days ago
2003
This paper presents an application of a DL reasoner to the optimization of an object-relational query language. Queries containing aggregate functions are difficult to optimize be...
JAPLL
2010
13 years 9 months ago
2010
Answering queries over an incomplete database w.r.t. a set of constraints is an important computational task with applications in fields as diverse as information integration and ...
VLDB
1991
ACM
14 years 2 months ago
1991
ACM
In this paper we present a technique to optimize queries on deductive databases that use aggregate operations such as min, max, and “largest Ic values.” Our approach is based ...
ECAI
1998
Springer
14 years 2 months ago
1998
Springer
Abstract. We extend different Description Logics by concrete domains (such as integers and reals) and by aggregation functions over these domains (such as min;max;count;sum), which...
ADBIS
2000
Springer
14 years 3 months ago
2000
Springer
Queries involving aggregation are typical in a number of database research areas, such as data warehousing, global information systems and mobile computing. One of the main ideas ...