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cs.DB updates on arXiv.org

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A short note on the counting complexity of conjunctive qu...
Stefan Mengel · 2021-12-02 · via cs.DB updates on arXiv.org

This note closes a minor gap in the literature on the counting complexity of conjunctive queries by showing that queries that are not free-connex do not have a linear time counting algorithm under standard complexity assumptions. More generally, it is shown that the so-called quantified star size is a lower bound for the exponent in the runtime of any counting algorithm for conjunctive queries.

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