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....
| Главный автор: | |
|---|---|
| Формат: | Conference item |
| Язык: | English |
| Опубликовано: |
Association for Computing Machinery
2021
|