Belnap-Dunn logic and query answering in inconsistent databases with null values
Abstract
This paper concerns an expansion of first-order Belnap-Dunn logic, named , and an application of this logic in the area of relational database theory. The notion of a relational database, the notion of a query applicable to a relational database, and several notions of an answer to a query with respect to a relational database are considered from the perspective of this logic, taking into account that a database may be an inconsistent database or a database with null values. The chosen perspective enables among other things the definition of a notion of a consistent answer to a query with respect to a possibly inconsistent database without resort to database repairs. For each of the notions of an answer considered, being an answer to a query with respect to a database of the kind considered is decidable.
Keywords
Cite
@article{arxiv.2303.05264,
title = {Belnap-Dunn logic and query answering in inconsistent databases with null values},
author = {C. A. Middelburg},
journal= {arXiv preprint arXiv:2303.05264},
year = {2024}
}
Comments
26 pages; revision of v1, presentation improved at several places and DOIs added to the papers in the references. arXiv admin note: text overlap with arXiv:2301.10555