Query Containment for Conjunctive Queries With Regular Expressions

Summary: Proves decidability of query containment for STRUQLO (conjunctive queries with regular path expressions) by reducing it to checking finitely many canonical databases. Introduces syntactic 'query mappings' generalizing CQ containment mappings and shows an NP‑complete restricted fragment. (summarized by gpt-5-mini on Feb 09 2026)

Paper ID: 1139
Venue: PODS
Year: 1998
Pagerank: 0.00016428374
Overall Rank: 810 | 94.37%
DOI: -

Incoming Non-self Citations Over Time

Authors

Incoming Citations (Sorted by Pagerank)

Showing 28 of 28 citing papers.

Rank	Citing Paper	Year	Venue	Pagerank
48	Data Integration: A Theoretical Perspective	2002	PODS	0.00069720859
882	DTD Inference for Views of XML Data	2000	PODS	0.00015657456
1,037	Querying Graph Databases	2013	PODS	0.00014502493
1,812	Expressive Languages for Path Queries over Graph-Structured Data	2010	PODS	0.00010467069
2,342	Rewriting of Regular Expressions and Regular Path Queries	1999	PODS	9.0015589e-05
2,399	Query Rewriting for Semistructured Data	1999	SIGMOD	8.8973689e-05
2,956	Efficient Algorithms for Minimizing Tree Pattern Queries	2002	SIGMOD	7.821865e-05
3,084	On the minimization of Xpath queries	2003	VLDB	7.6011919e-05
3,652	The Complexity of Evaluating Path Expressions in SPARQL	2012	PODS	6.875313e-05
3,681	Queries with Incomplete Answers over Semistructured Data	1999	PODS	6.8492288e-05
5,406	Query Containment and Rewriting Using Views for Regular Path Queries Under Constraints	2003	PODS	5.5243825e-05
5,517	Representing Paths in Graph Database Pattern Matching	2023	VLDB	5.4626107e-05
6,294	Containment of Nested XML Queries	2004	VLDB	5.1255418e-05
6,490	Spanners: A Formal Framework for Information Extraction	2013	PODS	5.0431719e-05
6,820	Conjunctive Regular Path Queries with String Variables	2020	PODS	4.9157306e-05
6,848	Flag & Check: Data Access with Monadically Defined Queries	2013	PODS	4.9089877e-05
6,896	Containment of Graph Queries Modulo Schema	2024	PODS	4.8925595e-05
6,948	Semantic Acyclicity on Graph Databases	2013	PODS	4.8898337e-05
7,275	The Impact of Virtual Views on Containment	2010	VLDB	4.7806552e-05
7,298	Structured Materialized Views for XML Queries	2007	VLDB	4.770411e-05
7,897	Correlation Constraint Shortest Path over Large Multi-Relation Graphs	2019	VLDB	4.6230399e-05
8,804	Conjunctive Regular Path Queries under Injective Semantics	2023	PODS	4.4468701e-05
8,827	The Complexity of Regular Trail and Simple Path Queries on Undirected Graphs	2022	PODS	4.4411907e-05
9,676	Schema-Based Query Optimisation for Graph Databases	2025	SIGMOD	4.3047774e-05
9,826	Exploiting Structure in Regular Expression Queries	2023	SIGMOD	4.2751057e-05
10,349	Minimizing Conjunctive Regular Path Queries	2025	PODS	4.1945683e-05
11,326	Data Path Queries over Embedded Graph Databases	2022	PODS	4.1945683e-05
12,168	Determining Relevance of Accesses at Runtime	2011	PODS	4.1945683e-05

Outgoing Citations (Sorted by Pagerank)

Showing 14 of 14 cited papers.

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

Rank	Cited Paper	Year	Venue	Pagerank
82	Answering Queries Using Views (Extended Abstract)	1995	PODS	0.00054402763
114	A Query Language and Optimization Techniques for Unstructured Data	1996	SIGMOD	0.00046339735
127	Querying Heterogeneous Information Sources Using Source Descriptions	1996	VLDB	0.00044642203
200	OPTIMIZING DATALOG PROGRAMS (Extended Abstract)	1987	PODS	0.00035012858
581	The Complexity of Querying Indefinite Data about Linearly Ordered Domains (Preliminary Version)	1992	PODS	0.00019767772
844	Object Fusion in Mediator Systems	1996	VLDB	0.00016004956
909	On the Equivalence of Recursive and Nonrecursive Datalog Programs	1992	PODS	0.00015428222
938	Queries Independent of Updates	1993	VLDB	0.00015197786
1,081	Catching the Boat with Strudel: Experiences with a Web-Site Management System	1998	SIGMOD	0.00014216794
1,314	Semistructured Data	1997	PODS	0.0001263326
1,490	On the Decidability of Query Containment under Constraints	1998	PODS	0.00011699154
1,578	Constraint Checking with Partial Information	1994	PODS	0.00011284233
1,991	Decidability and Undecidability Results for Boundedness of Linear Recursive Queries	1988	PODS	9.84713e-05
3,413	On the Complexity of Equivalence between Recursive and Nonrecursive Datalog Programs	1994	PODS	7.1240395e-05

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2,399	Query Rewriting for Semistructured Data	1999	SIGMOD	8.8973689e-05
1,952	Deciding Containment for Queries with Complex Objects (Extended Abstract)	1997	PODS	9.9677831e-05
8,804	Conjunctive Regular Path Queries under Injective Semantics	2023	PODS	4.4468701e-05
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7,070	On the Decidability of Containment of Recursive Datalog Queries - Preliminary report	2004	PODS	4.843579e-05
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