Study on consistent query answering in inconsistent databases

Consistent query answering is an approach to retrieving consistent answers over databases that might be inconsistent with respect to some given integrity constraints. The approach is based on a concept of repair. This paper surveys several recent researches on obtaining consistent information from inconsistent databases, such as the underlying semantic model, a number of approaches to computing consistent query answers and the computational complexity of this problem. Furthermore, the work outlines potential research directions in this area.