Consistent query answering (CQA) is an approach to querying inconsistent databases
without repairing them first. This invited talk introduces the basics of CQA, and discusses …

For several reasons databases may become inconsistent with respect to a given set of
integrity constraints (ICs):(a) The DBMS have no mechanism to maintain certain classes of …

We describe the Consistency Extractor System (Cons Ex) that computes consistent answers
to Datalog queries with negation posed to relational databases that may be inconsistent with …

In this work we establish and investigate connections between causes for query answers in
databases, database repairs with respect to denial constraints, and consistency-based …

Schema matching is the task of matching between concepts describing the meaning of data
in various heterogeneous, distributed data sources. With many heuristics to choose from …

We study active integrity constraints and revision programming, two formalisms designed to
describe integrity constraints on databases and to specify policies on preferred ways to …

We may want to keep sensitive information in a relational database hidden from a user or
group thereof. We characterize sensitive data as the extensions of secrecy views. The …

A dimension in a data warehouse (DW) is a set of elements connected by a hierarchical
relationship. The elements are used to view summaries of data at different levels of …

In this work we establish and investigate connections between causality for query answers
in databases, database repairs wrt. denial constraints, and consistency-based diagnosis …

We propose and investigate a semantics for peer data exchange systems where different
peers are related by data exchange constraints and trust relationships. These two elements …