{"type":"ScholarlyArticle","title":"Query rewriting and answering under constraints in data integration systems","authors":[{"name":"Andrea Calì","slug":"andrea-cali","given":"Andrea","family":"Calì","affiliation":""},{"name":"Domenico Lembo","slug":"domenico-lembo","given":"Domenico","family":"Lembo","affiliation":""},{"name":"Riccardo Rosati","slug":"riccardo-rosati","given":"Riccardo","family":"Rosati","affiliation":""}],"abstract":"In this paper we address the problem of query answering and rewriting in global-as-view data integration systems, when key and inclusion dependencies are expressed on the global integration schema. In the case of sound views, we provide sound and complete rewriting techniques for a maximal class of constraints for which decidability holds. Then, we introduce a semantics which is able to cope with violations of constraints, and present a sound and complete rewriting technique for the same decidable class of constraints. Finally, we consider the decision problem of query answering and give decidability and complexity results.","doi":null,"url":"https://ijcai.org/proceedings/2003/3","pdf":"https://ijcai.org/proceedings/2003/0003.pdf","markdown":"https://ijcai.org/proceedings/2003/3.md","bibtex":"https://ijcai.org/proceedings/2003/bibtex/3","volume":{"slug":"2003","title":"Proceedings of the Eighteenth International Joint Conference on Artificial Intelligence","short_title":"IJCAI 2003","url":"https://ijcai.org/proceedings/2003/","year":2003,"location":"Acapulco, Mexico","dates":"","editors":"Georg Gottlob","isbn":"","publisher":"International Joint Conferences on Artificial Intelligence","doi_prefix":""},"section":null,"track":"","number":3,"pages":{"first":16,"last":20},"keywords":[],"videos":[],"references":[],"license_note":"Copyright International Joint Conferences on Artificial Intelligence."}