Technique of the Use for Quantifications and Null Values in SQL

DING Baokang. Technique of the Use for Quantifications and Null Values in SQLJ. Journal of Computer Research and Development, 1994, 31(3).

Citation:

DING Baokang. Technique of the Use for Quantifications and Null Values in SQLJ. Journal of Computer Research and Development, 1994, 31(3).

Citation:

DING Baokang. Technique of the Use for Quantifications and Null Values in SQLJ. Journal of Computer Research and Development, 1994, 31(3).

Abstract

In SQL we introduce a mark of universal quantification-FORALL to use SQL more naturally.This paper discusses the transformations,relationships and differences between FORALL predicates,EXISTS predicates and ALL predicates in existing or not existing null values.

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