On the First-order Expressibility of Computing Certain Answers to Conjunctive Queries over Uncertain Databases

Summary: Characterize when CERTAINTY(q) is FO-expressible for Boolean conjunctive queries over key-violating (uncertain) databases, giving a necessary syntactic condition for queries without self‑join. For acyclic CQs the condition is also sufficient, yielding a decision procedure and a constructive FO‑rewriting (hence AC0). (summarized by gpt-5-mini on Feb 09 2026)

Paper ID: 1517
Venue: PODS
Year: 2010
Pagerank: 5.7068548e-05
Overall Rank: 7,088 | 51.38%
DOI: 10.1145/1807085.1807111

Incoming Non-self Citations Over Time

Authors

1. Jef Wijsen (University of Mons)

BibTeX Citation

@inproceedings{wijsen_pods10,
        address = {New York, NY, USA},
        series = {{PODS} '10},
        title = {{On the First-order Expressibility of Computing Certain Answers to Conjunctive Queries over Uncertain Databases}},
        url = {https://dl.acm.org/doi/10.1145/1807085.1807111},
        doi = {10.1145/1807085.1807111},
        booktitle = {Proceedings of the {ACM} {SIGMOD} Symposium on {Principles} of {Database} {Systems}},
        publisher = {Association for Computing Machinery},
        author = {Wijsen, Jef},
        year = {2010}
}

Incoming Citations (Sorted by Pagerank)

Showing 14 of 14 citing papers.

Rank	Citing Paper	Year	Venue	Pagerank
1,707	The Data Complexity of Consistent Query Answering for Self-Join-Free Conjunctive Queries Under Primary Key Constraints	2015	PODS	9.9625097e-05
4,811	Uncertainty Annotated Databases - A Lightweight Approach for Approximating Certain Answers	2019	SIGMOD	6.4983069e-05
5,773	Consistent Query Answering for Primary Keys and Conjunctive Queries with Negated Atoms	2018	PODS	6.0926349e-05
7,558	Consistent Query Answering for Primary Keys on Path Queries	2021	PODS	5.5993651e-05
8,228	CAvSAT: A System for Query Answering over Inconsistent Databases	2019	SIGMOD	5.4621278e-05
8,260	Efficient Uncertainty Tracking for Complex Queries with Attribute-level Bounds	2021	SIGMOD	5.4574671e-05
8,626	Charting the Tractability Frontier of Certain Conjunctive Query Answering	2013	PODS	5.3970875e-05
9,133	First-Order Rewritability in Consistent Query Answering with Respect to Multiple Keys	2020	PODS	5.3169677e-05
10,650	Rewriting Consistent Answers on Annotated Data	2025	PODS	5.093636e-05
11,121	Consistent Query Answering for Primary Keys on Rooted Tree Queries	2024	PODS	5.093636e-05
11,146	Computing Range Consistent Answers to Aggregation Queries via Rewriting	2024	PODS	5.093636e-05
11,384	LinCQA: Faster Consistent Query Answering with Linear Time Guarantees	2023	SIGMOD	5.093636e-05
11,524	A Dichotomy in Consistent Query Answering for Primary Keys and Unary Foreign Keys	2022	PODS	5.093636e-05
12,210	Certain Query Answering in Partially Consistent Databases	2014	VLDB	5.093636e-05

Outgoing Citations (Sorted by Pagerank)

Showing 3 of 3 cited papers.

Citations counted here include only citations to other VLDB/SIGMOD/CIDR/PODS papers in this database.

Rank	Cited Paper	Year	Venue	Pagerank
33	Consistent Query Answers in Inconsistent Databases	1999	PODS	0.00049907763
586	ConQuer: Efficient Management of Inconsistent Databases	2005	SIGMOD	0.00016124396
2,775	MayBMS: A Probabilistic Database Management System	2009	SIGMOD	8.1359291e-05

Semantically Similar Papers

#	Overall Rank	Paper	Year	Venue
1	7,558	Consistent Query Answering for Primary Keys on Path Queries	2021	PODS
2	11,524	A Dichotomy in Consistent Query Answering for Primary Keys and Unary Foreign Keys	2022	PODS
3	10,650	Rewriting Consistent Answers on Annotated Data	2025	PODS
4	5,245	Certain Answers Meet Zero-One Laws	2018	PODS
5	9,133	First-Order Rewritability in Consistent Query Answering with Respect to Multiple Keys	2020	PODS
6	11,121	Consistent Query Answering for Primary Keys on Rooted Tree Queries	2024	PODS
7	5,773	Consistent Query Answering for Primary Keys and Conjunctive Queries with Negated Atoms	2018	PODS
8	1,707	The Data Complexity of Consistent Query Answering for Self-Join-Free Conjunctive Queries Under Primary Key Constraints	2015	PODS
9	8,626	Charting the Tractability Frontier of Certain Conjunctive Query Answering	2013	PODS
10	12,210	Certain Query Answering in Partially Consistent Databases	2014	VLDB