Answering Queries Using Limited External Query Processors

Summary: Partitions infinite (finitely encoded) view-sets into finitely many equivalence classes so one representative per class suffices to test conjunctive-query rewritability. Provides algorithms for datalog-encoded views, handles built-ins (<,<=,=,!=) on dense domains and integers, and gives an integer query-minimization procedure. (summarized by gpt-5-mini on Feb 09 2026)

Paper ID: hc738a6551425497a
Venue: PODS
Year: 1996
Pagerank: 0.00012275281
Overall Rank: 1,052 | 92.93%
DOI: 10.1145/237661.237716

Incoming Non-self Citations Over Time

Authors

1. Alon Y. Levy (AT&T)
2. Anand Rajaraman (Stanford University)
3. Jeffrey D. Ullman (Stanford University)

BibTeX Citation

@inproceedings{levy_pods96,
        address = {New York, NY, USA},
        series = {{PODS} '96},
        title = {{Answering Queries Using Limited External Query Processors}},
        url = {https://dl.acm.org/doi/10.1145/237661.237716},
        doi = {10.1145/237661.237716},
        booktitle = {Proceedings of the {ACM} {SIGMOD} Symposium on {Principles} of {Database} {Systems}},
        publisher = {Association for Computing Machinery},
        author = {Levy, Alon Y. and Rajaraman, Anand and Ullman, Jeffrey D.},
        year = {1996}
}

Incoming Citations (Sorted by Pagerank)

Showing 19 of 19 citing papers.

Rank	Citing Paper	Year	Venue	Pagerank
24	Data Integration: A Theoretical Perspective	2002	PODS	0.00055043581
117	Querying Heterogeneous Information Sources Using Source Descriptions	1996	VLDB	0.00031630695
173	Optimizing Queries across Diverse Data Sources	1997	VLDB	0.00026826959
238	Complexity of Answering Queries Using Materialized Views	1998	PODS	0.00023591683
532	Answering Recursive Queries Using Views	1997	PODS	0.0001682881
813	Composing Mappings Among Data Sources	2003	VLDB	0.00013722762
824	Data Integration: The Teenage Years	2006	VLDB	0.00013646923
1,525	Managing Semantic Heterogeneity in Databases : A Theoretical Perspective	1997	PODS	0.00010355628
2,127	Query Rewriting for Semistructured Data	1999	SIGMOD	9.0005009e-05
2,147	Query Decomposition and View Maintenance for Query Languages for Unstructured Data	1996	VLDB	8.9576491e-05
2,574	Rewriting Queries Using Views in Description Logics	1997	PODS	8.278796e-05
2,945	Mind Your Vocabulary: Query Mapping Across Heterogeneous Information Sources	1999	SIGMOD	7.8251112e-05
3,564	QURSED: Querying and Reporting Semistructured Data	2002	SIGMOD	7.204119e-05
3,620	Describing and Using Query Capabilities of Heterogeneous Sources	1997	VLDB	7.1548155e-05
5,841	On the Containment and Equivalence of Database Queries with Linear Constraints* (Extended Abstract)	1997	PODS	5.9735439e-05
6,645	Interactive Query Formulation over Web Service-Accessed Sources	2006	SIGMOD	5.7224348e-05
7,805	Positive Higher-Order Queries	2010	PODS	5.4501544e-05
12,681	HOMES: A Higher-Order Mapping Evaluation System	2011	VLDB	4.9793485e-05
13,178	Approximate Query Translation Across Heterogeneous Information Sources	2000	VLDB	4.9793485e-05

Outgoing Citations (Sorted by Pagerank)

Showing 13 of 13 cited papers.

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

Rank	Cited Paper	Year	Venue	Pagerank
72	Answering Queries Using Views (Extended Abstract)	1995	PODS	0.00037549176
117	Querying Heterogeneous Information Sources Using Source Descriptions	1996	VLDB	0.00031630695
167	Query Transformation for PSJ-queries	1987	VLDB	0.00027190004
301	Answering Queries Using Templates With Binding Patterns (Extended Abstract)	1995	PODS	0.00021682744
577	The GMAP: A Versatile Tool for Physical Data Independence	1994	VLDB	0.00016118789
642	The Complexity of Querying Indefinite Data about Linearly Ordered Domains (Preliminary Version)	1992	PODS	0.00015243164
875	Queries Independent of Updates	1993	VLDB	0.00013316445
1,417	SIMS: Retrieving and Integrating Information From Multiple Sources	1993	SIGMOD	0.00010731699
1,521	Constraint Checking with Partial Information	1994	PODS	0.00010379636
1,822	Adapting Materialized Views after Redefinitions	1995	SIGMOD	9.5664616e-05
1,876	Sleepers and Workaholics: Caching Strategies in Mobile Environments	1994	SIGMOD	9.4539144e-05
3,533	Data Replication for Mobile Computers	1994	SIGMOD	7.2258575e-05
3,886	Constraints and Redundancy in Datalog	1992	PODS	6.9461797e-05

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