Counting Solutions to Conjunctive Queries: Structural and Hybrid Tractability
Summary: Quantified-star-size with hypertree decompositions characterizes tractable counting only for bounded-arity simple CQs; in general it is insufficient. Introduce #-generalized hypertree decompositions yielding FPT preprocessing + polynomial-time counting for bounded #-ghw, and a hybrid method that leverages database constraints (keys/FDs) to expand tractable classes. (summarized by gpt-5-mini on Feb 09 2026)
Incoming Non-self Citations Over Time
Authors
- 1. Gianluigi Greco (University of Calabria)
- 2. Francesco Scarcello (University of Calabria)
BibTeX Citation
@inproceedings{greco_pods14,
address = {New York, NY, USA},
series = {{PODS} '14},
title = {{Counting Solutions to Conjunctive Queries: Structural and Hybrid Tractability}},
url = {https://dl.acm.org/doi/10.1145/2594538.2594559},
doi = {10.1145/2594538.2594559},
booktitle = {Proceedings of the {ACM} {SIGMOD} Symposium on {Principles} of {Database} {Systems}},
publisher = {Association for Computing Machinery},
author = {Greco, Gianluigi and Scarcello, Francesco},
year = {2014}
}Incoming Citations (Sorted by Pagerank)
Showing 5 of 5 citing papers.
| Rank | Citing Paper | Year | Venue | Pagerank |
|---|---|---|---|---|
| 358 | FAQ: Questions Asked Frequently | 2016 | PODS | 0.00020243592 |
| 636 | Answering Conjunctive Queries under Updates | 2017 | PODS | 0.0001551856 |
| 814 | Hypertree Decompositions: Questions and Answers | 2016 | PODS | 0.00013841737 |
| 4,266 | Counting Answers to Existential Positive Queries: A Complexity Classification | 2016 | PODS | 6.7936492e-05 |
| 11,140 | Counting Answers to Unions of Conjunctive Queries: Natural Tractability Criteria and Meta-Complexity | 2024 | PODS | 5.093636e-05 |
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Outgoing Citations (Sorted by Pagerank)
Showing 5 of 5 cited papers.
Citations counted here include only citations to other VLDB/SIGMOD/CIDR/PODS papers in this database.
| Rank | Cited Paper | Year | Venue | Pagerank |
|---|---|---|---|---|
| 673 | Generalized Hypertree Decompositions: NP-Hardness and Tractable Variants | 2007 | PODS | 0.00015095061 |
| 1,673 | Robbers, Marshals, and Guards: Game Theoretic and Logical Characterizations of Hypertree Width | 2001 | PODS | 0.00010040854 |
| 2,678 | Weighted Hypertree Decompositions and Optimal Query Plans | 2004 | PODS | 8.2680182e-05 |
| 4,107 | Processing Queries on Tree-Structured Data Efficiently | 2006 | PODS | 6.8973582e-05 |
| 7,759 | The Power of Tree Projections: Local Consistency, Greedy Algorithms, and Larger Islands of Tractability | 2010 | PODS | 5.5505938e-05 |
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