WebConsistent Query Answering for Self-Join-Free Conjunctive Queries 9:3 with each other or with constant values. It is natural to distinguish between possible and certain answers: the possible answer to a query consists of the tuples that are in the answer to the query on some repair, while the certain (or consistent) answer http://www.cse.buffalo.edu/~chomicki/papers-icdt07.pdf early age synonym WebJun 20, 2024 · Consistent query answering (CQA) is an alternative approach to data cleaning that asks for all tuples guaranteed to be returned by a given query on all (in most cases, exponentially many) repairs ... Webtent query answering, an approach to handle database in-consistencyin a systematic andlogicalmannerbasedon the notion of repair. It discusses some computational and se-mantic limitations of consistent query answering, and sum-marizes selected research directions in this area. 1. Introduction Nowadays more and more database applications … early age synonyms in english Webof data is not always convenient or possible. Therefore, when answering a user query, the system should be able to “virtually repair” relevant data (in the line of Arenas et al. 2003; … WebConsistent query answering (CQA) is an alternative approach to data cleaning that asks for all tuples guaranteed to be returned by a given query on all (in most cases, exponentially many) repairs of the inconsis-tent data. This paper identifies a class of acyclic select-project-join (SPJ) queries for which CQA can be solved via SQL rewriting with early age of menstruation WebJan 9, 2024 · Queries are issued against T and evaluated in Tuples. In this setting, we consider a query Q: select X from T where Condition over T and define its consistent answer to be the set of tuples x in Tuples such that: x is a true and consistent tuple with schema X and there exists a true super-tuple t of x in Tuples satisfying the condition.

WebOct 8, 2024 · Download PDF Abstract: We study the complexity of consistent query answering on databases that may violate primary key constraints. A repair of such a database is any consistent database that can be obtained by deleting a minimal set of tuples. For every Boolean query q, CERTAINTY(q) is the problem that takes a database … WebThe Data Complexity of Consistent Query Answering for Self-Join-Free Conjunctive Queries Under Primary Key Constraints. In PODS. 17--29. Google Scholar; Paraschos Koutris and Jef Wijsen. 2024. Consistent Query Answering for Primary Keys in Datalog. Theory Comput. Syst., Vol. 65, 1 (2024), 122--178. early age of menopause http://www.cse.buffalo.edu/~chomicki/papers-icdt07.pdf#:~:text=Abstract.%20Consistent%20query%20answering%20%28CQA%29%20is%20an%20approach,an%20outlineof%20potential%20future%20research%20topics.%201%20Introduction WebJun 1, 2024 · The data complexity of consistent query answering for self-join-free conjunctive queries under primary key constraints. In Tova Milo and Diego Calvanese (Eds.). 2015. Proceedings of the 34th ACM Symposium on Principles of Database Systems, PODS 2015, Melbourne, Victoria, Australia, May 31 - June 4, 2015. ACM. 17--29. classico west windsor nj WebThis is the problem of consistent query answering (CQA). The notion of consistency of a database is a holistic notion, that applies to the entire database, and not to portions of it. In consequence, in order to pursue this idea of retrieving consistent query answers, it becomes necessary to characterize the consistent data in an inconsistent ... WebJun 20, 2024 · Consistent query answering (CQA) aims to deliver meaningful answers when queries are evaluated over inconsistent databases. Such answers must be certainly true in all repairs, which are consistent databases whose difference from the inconsistent one is somehow minimal. Although CQA provides a clean framework for querying … classico wiki WebConsistent query answering (CQA) is an approach to query-ing inconsistent databases without repairing them first. This invited talk introduces the basics of CQA, and discusses selected issues in this area. The talk concludes with a …

WebConsistent Query Answering (CQA). It is a declara-tive approach to manage inconsistency that has been ex-tensively studied in both databases and knowledge bases (KBs) (Bertossi 2011; Bienvenu and Bourgaux 2016). The crucial … early age是什么意思 WebWe study the complexity of consistent query answering with respect to primary key violations, for self-join-free conjunctive queries. A repair of a possibly inconsistent database is obtained by selecting a maximal number of tuples without selecting two ... early age menopause symptoms