Bag containment of join-on-free queries
Bag containment of join-on-free queries
Bag-semantics allows for atomic relations and query answers to contain multiple copies of the same data tuple, reflecting real-world database systems more accurately. Deciding containment under bag-semantics (or simply, bag-containment) for two conjunctive queries (CQs) requires determining whether the answer of the first query, taking multiplicities into account, is contained within the answer of the second query, across all databases. Despite numerous attempts in the last thirty years, this problem of determining decidability and complexity of this task remains open as one of the prominent challenges in database theory, given its relevance in important applications.
5: 1-5: 18
Konstantinidis, George
f174fb99-8434-4485-a7e4-bee0fef39b42
Mogavero, Fabio
8a05b57c-db22-4216-95d1-7c35d5975ee1
25 March 2025
Konstantinidis, George
f174fb99-8434-4485-a7e4-bee0fef39b42
Mogavero, Fabio
8a05b57c-db22-4216-95d1-7c35d5975ee1
Konstantinidis, George and Mogavero, Fabio
(2025)
Bag containment of join-on-free queries.
Proceedings of the 28th International Conference on Database Theory (ICDT 2025), , Barcelona, Spain.
25 - 28 Mar 2025.
.
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Conference or Workshop Item
(Paper)
Abstract
Bag-semantics allows for atomic relations and query answers to contain multiple copies of the same data tuple, reflecting real-world database systems more accurately. Deciding containment under bag-semantics (or simply, bag-containment) for two conjunctive queries (CQs) requires determining whether the answer of the first query, taking multiplicities into account, is contained within the answer of the second query, across all databases. Despite numerous attempts in the last thirty years, this problem of determining decidability and complexity of this task remains open as one of the prominent challenges in database theory, given its relevance in important applications.
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Published date: 25 March 2025
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Proceedings of the 28th International Conference on Database Theory (ICDT 2025), , Barcelona, Spain, 2025-03-25 - 2025-03-28
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Local EPrints ID: 504292
URI: http://eprints.soton.ac.uk/id/eprint/504292
PURE UUID: b941d335-91d9-4ad6-9fc4-75e87054a199
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Date deposited: 02 Sep 2025 17:11
Last modified: 02 Sep 2025 17:11
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Contributors
Author:
George Konstantinidis
Author:
Fabio Mogavero
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