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A critique of Claude Rubinson's paper nulls, three - valued logic, and ambiguity in SQL
ACM SIGMOD Record, 2008 I’d like to thank Claude Rubinson for his thoughtful critique [3] of my remarks in reference [1] on nulls and three-valued logic (3VL). Clearly we’re in agreement on the major issues; as Rubinson says, “I agree with Date that three-valued logic is incompatible with database management systems.” We also agree that null isn’t a value; as Rubinson says ...
C. J. Date
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NULL-Werte und dreiwertige Logik in SQL
, 1992 In relationalen Datenbanken ist es ublich, das gewisse Felder „NULL“ sein konnen (vgl. [Date86]). Wir sagen hier bewust nicht „den Wert NULL haben“. NULL kann u.a. bedeuten, das der aktuelle Wert eines Attributs unbekannt ist. Andere Arten von Nullen, wie z.B. „nicht anwendbar“ oder „gibt es nicht“ werden hier nicht behandelt, (vgl.
Günter Matthiessen
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Handling Null Values in SQL Queries on Relational Databases
2024 10th International Conference on Engineering, Applied Sciences, and Technology (ICEAST)Manuel Méndez +2 more
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Null znak i trovalentna logika u SQL-u
2010Opisan je implementacija trovalentne logike u SQL-u.
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On the Tractability of Certain Answers for SQL Nulls in Relational Algebra with Inequalities.
, 2018 Etienne Toussaint
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