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The Computer Journal 1989 32(1):90-91; doi:10.1093/comjnl/32.1.90
© 1989 by British Computer Society
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Short Notes

Semantics and Problems of Universal Quantification in SQL

M. Negri1, G. Pelagatti1 and L. Sbattella2 *

1 Dipartimento di Automazione Industriale, Facolta di Ingegneria, Universita Statale di Brecia, V. Valotti 9, Brescia, Italy, 2 Dipartimento di Elettronica, Politecnico di Milano, Piazza Leonardo da Vinci 32, 20132, Milano, Italy

A query language should both rely safely on formal logic and suggest, with its syntax, the correct interpretation.

This paper shows that a syntactic construct of SQL, which allows the expression of queries involving universal quantification of tuple-variables, does not satisfy the above requirement and suggests how the construct could be modified in order to avoid wrong interpretations.


* Dipartimento di Elettronica, Politecnico di Milano, Piazza Leonardo da Vinci 32, 20132, Milano, Italy

§ Dipartimento di Automazione Industriale, Facolta di Ingegneria, Universita Statale di Brescia, V. Valotti 9, Brescia, Italy


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