Answering Aggregate Queries in Data Exchange

Summary: Argues existing solution-sets are unsuitable for aggregation in data exchange and proposes using endomorphic images of the canonical universal solution (strict CWA) as the possible-worlds semantics. For s-t tgds: polynomial-time algorithms compute range semantics (GLB/LUB) for all scalar aggregates; average requires core-based techniques; possible-answer for avg is NP-complete. (summarized by gpt-5-mini on Feb 09 2026)

Paper ID: hfeb7d72c856cbe06
Venue: PODS
Year: 2008
Pagerank: 6.0044594e-05
Overall Rank: 5,751 | 61.35%
DOI: 10.1145/1376916.1376936

Incoming Non-self Citations Over Time

Authors

1. Foto Afrati (National Technical University of Athens)
2. Phokion G. Kolaitis (IBM; University of California Santa Cruz)

BibTeX Citation

@inproceedings{afrati_pods08,
        address = {New York, NY, USA},
        series = {{PODS} '08},
        title = {{Answering Aggregate Queries in Data Exchange}},
        url = {https://dl.acm.org/doi/10.1145/1376916.1376936},
        doi = {10.1145/1376916.1376936},
        booktitle = {Proceedings of the {ACM} {SIGMOD} Symposium on {Principles} of {Database} {Systems}},
        publisher = {Association for Computing Machinery},
        author = {Afrati, Foto and Kolaitis, Phokion G.},
        year = {2008}
}

Incoming Citations (Sorted by Pagerank)

Showing 6 of 6 citing papers.

Rank	Citing Paper	Year	Venue	Pagerank
4,408	Normalization and Optimization of Schema Mappings	2009	VLDB	6.6094372e-05
8,435	Efficient Uncertainty Tracking for Complex Queries with Attribute-level Bounds	2021	SIGMOD	5.3324907e-05
8,508	Reflections on Schema Mappings, Data Exchange, and Metadata Management	2018	PODS	5.3269436e-05
9,410	Queries with Arithmetic on Incomplete Databases	2020	PODS	5.1820871e-05
10,411	Tractability Frontiers of the Shapley Value for Aggregate Conjunctive Queries	2026	PODS	4.9769913e-05
12,576	Getting Unique Solution in Data Exchange	2013	VLDB	4.9769913e-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
392	Data Exchange: Getting to the Core	2003	PODS	0.00019215652
481	Clio Grows Up: From Research Prototype to Industrial Tool	2005	SIGMOD	0.00017600067
595	ConQuer: Efficient Management of Inconsistent Databases	2005	SIGMOD	0.00015791577
703	Composing Schema Mappings: Second-Order Dependencies to the Rescue	2004	PODS	0.00014653248
1,460	Inverting Schema Mappings	2006	PODS	0.00010580166
1,522	Composition of Mappings Given by Embedded Dependencies	2005	PODS	0.00010362522
2,101	XML Data Exchange: Consistency and Query Answering	2005	PODS	9.0459184e-05
2,392	Quasi-inverses of Schema Mappings	2007	PODS	8.5327323e-05
2,554	Peer Data Exchange	2005	PODS	8.3016938e-05
2,596	Computing Cores for Data Exchange: New Algorithms and Practical Solutions	2005	PODS	8.2387266e-05
2,990	Data Exchange and Incomplete Information	2006	PODS	7.7719132e-05
3,368	Data Exchange: Computing Cores in Polynomial Time	2006	PODS	7.3687982e-05
4,897	CWA-Solutions for Data Exchange Settings with Target Dependencies	2007	PODS	6.363076e-05

Semantically Similar Papers

#	Overall Rank	Paper	Year	Venue
1	12,576	Getting Unique Solution in Data Exchange	2013	VLDB
2	7,364	Schema Mappings for Data Graphs	2017	PODS
3	4,706	Towards a Theory of Schema-Mapping Optimization	2008	PODS
4	11,500	Computing Range Consistent Answers to Aggregation Queries via Rewriting	2024	PODS
5	2,292	Querying Aggregate Data	1999	PODS
6	3,564	The Complexity of Data Exchange	2006	PODS
7	4,533	Data Exchange beyond Complete Data	2011	PODS
8	4,370	Locally Consistent Transformations and Query Answering in Data Exchange	2004	PODS
9	4,473	Data Exchange and Schema Mappings in Open and Closed Worlds	2008	PODS
10	2,990	Data Exchange and Incomplete Information	2006	PODS