【摘要】 介绍了基于关系模型模糊扩展3个研究方向的工作成果,给出了基于关系模型模糊数据库的模糊数据划分方法和模糊关系数据库的SQL模糊扩展,依据模糊集合理论中隶属函数和隶属度的概念,运用模糊数据的划分方法得到了模糊数据的数据类型,实现了模糊数据在关系数据库中的存储.更多还原

【Abstract】 The international working achievement on the three research directions of the fuzzy extension based on relational model is briefly introduced.The method of the fuzzy data division of the fuzzy database based on relational model is presented.And the fuzzy extension to SQL of the fuzzy relational database is also presented.According to the conception of the "degree of membership"and the "function of membership" in the fuzzy sets theory,the data type of the fuzzy data is obtained with the application of the fuzzy data division method.The storage method of fuzzy data is achieved in the relational database.更多还原