Research And Application Of Relational Database's Design For Dynamic Fuzzy Data

The classical relational database system mostly aimy at the classical data,but the dynamic fuzzy data is very usual in our research work. How to design and run a dynamic fuzzy data oriented relational database system has been a new subject. There are two ways to realize a dynamic fuzzy data oriented relational database system. One is to set up a new system from a mathematical model,the other is to adjust the classical relational database system to the dynamic fuzzy data. On the basis of the basic characteristic of dynamic fuzzy data, the article makes a theoretic research on the former, and some practice on the latter. The new system adjusts the classical relational database system to the dynamic fuzzy data and it adds some new functions in order to realize saving and querying dynamic fuzzy data.The article introduces the way to set up the dynamic fuzzy relational data model and some relational calculation in detail, and put forward the way to establish dynamic fuzzy database model. The article also makes assumption of a kind of language for dynamic fuzzy relational data, and some research on dynamic fuzzy characteristic of data's link, constraint, calculation and operation, query and view. The difference between the management of classical relational database and dynamic fuzzy data oriented relational database is also discussed in the article.The new system takes Microsoft SQL Server 2000 as background database, and Windows as development platform, and Delphi as development tools. On the basis of the classical relational database system, a new management and evaluation system of truck fleet is set up, with the function of saving, managing and querying dynamic fuzzy data.