Semantic acyclicity under constraints
A conjunctive query (CQ) is semantically acyclic if it is equivalent to an acyclic one. Semantic acyclicity has been studied in the constraint-free case, and deciding whether a query enjoys this property is NP-complete. However, in case the database is subject to constraints such as tuple-generating...
| 主要な著者: | , , |
|---|---|
| フォーマット: | Conference item |
| 出版事項: |
Association for Computing Machinery
2016
|