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» Aggregates in Possibilistic Databases
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PODS
2001
ACM
79views Database» more  PODS 2001»
14 years 11 months ago
Equivalences among Aggregate Queries with Negation
Sara Cohen, Werner Nutt, Yehoshua Sagiv
ECAI
2000
Springer
14 years 3 months ago
Encoding Information Fusion in Possibilistic Logic: A General Framework for Rational Syntactic Merging
The problem of merging multiple sources information is central in many information processing areas such as databases integration problems, multiple criteria decision making, exper...
Salem Benferhat, Didier Dubois, Souhila Kaci, Henr...
VLDB
1991
ACM
165views Database» more  VLDB 1991»
14 years 2 months ago
Aggregation and Relevance in Deductive Databases
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 ...
S. Sudarshan, Raghu Ramakrishnan
PODS
2011
ACM
238views Database» more  PODS 2011»
13 years 1 months ago
Beyond simple aggregates: indexing for summary queries
Database queries can be broadly classified into two categories: reporting queries and aggregation queries. The former retrieves a collection of records from the database that mat...
Zhewei Wei, Ke Yi