27 citations
5 papers
Consistent query answers on numerical databases under aggregate constraints
Sergio Flesca, Filippo Furfaro, Francesco Parisi
The problem of extracting consistent information from relational databases violating integrity constraints on numerical data is addressed. In particular, aggregate constraints defi…
Quantum interference of electrons in a ring: tuning of the geometrical phase
R. Capozza, D. Giuliano, P. Lucignano +1
We calculate the oscillations of the DC conductance across a mesoscopic ring, simultaneously tuned by applied magnetic and electric fields orthogonal to the ring. The oscillations…
Estimating Range Queries using Aggregate Data with Integrity Constraints: a Probabilistic Approach
Francesco Buccafurri, Filippo Furfaro, Domenico Sacca'
The problem of recovering (count and sum) range queries over multidimensional data only on the basis of aggregate information on such data is addressed. This problem can be formali…
Enhancing Histograms by Tree-Like Bucket Indices
Francesco Buccafurri, Gianluca Lax, Domenico Sacca' +2
Histograms are used to summarize the contents of relations into a number of buckets for the estimation of query result sizes. Several techniques (e.g., MaxDiff and V-Optimal) have…
Outlier Detection by Logic Programming
Fabrizio Angiulli, Gianluigi Greco, Luigi Palopoli
The development of effective knowledge discovery techniques has become in the recent few years a very active research area due to the important impact it has in several relevant ap…