Tractability beyond β-acyclicity for conjunctive queries with negation
Numerous fundamental database and reasoning problems are known to be NP-hard in general but tractable on instances where the underlying hypergraph structure is β-acyclic. Despite the importance of many of these problems, there has been little success in generalizing these results beyond acyclicity....
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| 格式: | Conference item |
| 语言: | English |
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Association for Computing Machinery
2021
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