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...
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| 格式: | Conference item |
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Association for Computing Machinery
2016
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