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Computing the Difference of Conjunctive Queries Efficiently

Summary: Push-down the difference operator via structure-aware rewriting to near-linear time in input+output size for a broad class of conjunctive-query differences. Hardness for remaining cases; heuristics; speedups vs SQL on graphs. (summarized by gpt-5-nano on Feb 09 2026)

Paper ID
6718
Venue
SIGMOD
Year
2023
Pagerank
5.6852987e-05
Overall Rank
7,161 | 50.87%
DOI
10.1145/3589298

Incoming Non-self Citations Over Time

Authors

BibTeX Citation

@inproceedings{hu_sigmod23,
        title = {{Computing the Difference of Conjunctive Queries Efficiently}},
        author = {Hu, Xiao and Wang, Qichen},
        series = {{SIGMOD} '23},
        booktitle = {Proceedings of the {ACM} {SIGMOD} International Conference on Management of Data},
        publisher = {Association for Computing Machinery},
        doi = {10.1145/3589298},
        url = {https://dl.acm.org/doi/10.1145/3589298},
        year = {2023}
}

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