Application of Fuzzy Query Based on Relation Database

摘要

The traditional query in relation database is unable to satisfy the needs for dealing with fuzzy linguis-tic values. In this paper, a new data query tech-nique combined fuzzy theory and SQL is provided,and the query can be implemented for fuzzy linguis-tic values query via a interface to Microsoft Visual Foxpro. Here, we applied it to an realism instance,questions could be expressed by fuzzy linguistic val-ues such as young, high salary, etc, in Employee relation database. This could be widely used to realize the other fuzzy query based on database.