作　　者： ; ;

机构地区： 广西师范大学数学科学学院数学与计算机科学系

出　　处： 《计算机科学》 1999年第6期78-81,共4页

摘　　要： In this paper,based on probabilistic and cognitive uncertainties,we set up an uncertain database model and presented the uncertain relational algebra ,and proved that the uncertain normal forms are closed under operations of the uncertain relational algebra. At last ,we studied the semantics of the uncertain relation. In this paper,based on probabilistic and cognitive uncertainties,we set up an uncertain database model and presented the uncertain relational algebra,and proved that the uncertain normal forms are closed under operations of the uncertain relational algebra- At last,we studied the semantics of the uncertain relation.

关 键 词： 不确定性数据库模型 概率 定量模糊数据 关系代数

领　　域： [自动化与计算机技术] [自动化与计算机技术]