A framework for computing range-consistent answers of aggregate queries in the presence of aggregate constraints is introduced. The range-consistent answer of an aggregate query is the narrowest interval containing all the answers of the query evaluated on every possible repaired database. A wide form of aggregate constraints is considered, consisting of linear inequalities on aggregate-sum functions. In this setting, three types of aggregate queries are investigated, namely SUM, MIN, MAX queries. Our approach computes consistent answers by solving Integer Linear Programming (ILP) problem instances, thus enabling well-established techniques for ILP resolution to be exploited.
Range-Consistent Answers of Aggregate Queries under Aggregate Constraints
FLESCA, Sergio;FURFARO, Filippo;PARISI F.
2010-01-01
Abstract
A framework for computing range-consistent answers of aggregate queries in the presence of aggregate constraints is introduced. The range-consistent answer of an aggregate query is the narrowest interval containing all the answers of the query evaluated on every possible repaired database. A wide form of aggregate constraints is considered, consisting of linear inequalities on aggregate-sum functions. In this setting, three types of aggregate queries are investigated, namely SUM, MIN, MAX queries. Our approach computes consistent answers by solving Integer Linear Programming (ILP) problem instances, thus enabling well-established techniques for ILP resolution to be exploited.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
