On Monotonic Determinacy and Rewritability for Recursive Queries and Views

Michael Benedikt, Stanislav Kikot, Piotr Ostropolski-Nalewaja, Miguel Romero

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A query Q is monotonically determined over a set of views V if Q can be expressed as a monotonic function of the view image. In the case of relational algebra views and queries, monotonic determinacy coincides with rewritability as a union of conjunctive queries, and it is decidable in important special cases, such as for conjunctive query views and queries. We investigate the situation for views and queries in the recursive query language Datalog. We give both positive and negative results about the ability to decide monotonic determinacy, and also about the co-incidence of monotonic determinacy with Datalog rewritability.

Original languageEnglish
Article number3572836
JournalACM Transactions on Computational Logic
Issue number2
StatePublished - 17 Mar 2023
Externally publishedYes


  • Datalog
  • Views


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