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Practical Relational Calculus Query Evaluation

Authors Martin Raszyk , David Basin , Srđan Krstić , Dmitriy Traytel

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Martin Raszyk
  • Department of Computer Science, ETH Zürich, Switzerland
David Basin
  • Department of Computer Science, ETH Zürich, Switzerland
Srđan Krstić
  • Department of Computer Science, ETH Zürich, Switzerland
Dmitriy Traytel
  • Department of Computer Science, University of Copenhagen, Denmark

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Martin Raszyk, David Basin, Srđan Krstić, and Dmitriy Traytel. Practical Relational Calculus Query Evaluation. In 25th International Conference on Database Theory (ICDT 2022). Leibniz International Proceedings in Informatics (LIPIcs), Volume 220, pp. 11:1-11:21, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2022) https://doi.org/10.4230/LIPIcs.ICDT.2022.11

Abstract

The relational calculus (RC) is a concise, declarative query language. However, existing RC query evaluation approaches are inefficient and often deviate from established algorithms based on finite tables used in database management systems. We devise a new translation of an arbitrary RC query into two safe-range queries, for which the finiteness of the query’s evaluation result is guaranteed. Assuming an infinite domain, the two queries have the following meaning: The first is closed and characterizes the original query’s relative safety, i.e., whether given a fixed database, the original query evaluates to a finite relation. The second safe-range query is equivalent to the original query, if the latter is relatively safe. We compose our translation with other, more standard ones to ultimately obtain two SQL queries. This allows us to use standard database management systems to evaluate arbitrary RC queries. We show that our translation improves the time complexity over existing approaches, which we also empirically confirm in both realistic and synthetic experiments.

Subject Classification

ACM Subject Classification
  • Theory of computation → Database query languages (principles)
Keywords
  • Relational calculus
  • relative safety
  • safe-range
  • query translation

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