The study of rough relational database based on granular computing

摘要

In this paper, the data querying and the rough functional dependency of rough relational database are studied by granular computing and rough sets theory. First, the bit representations of granular computing are used in order to represent attributes values of rough relational database, and these equivalence granules (attributes values) are analyzed by rough sets theory. Second, data querying related to equivalence granules for rough relational database are discussed, we divide the data querying into two types: certain data querying and possible data querying, in addition, rough functional dependency based on bit representation is investigated and some important conclusions are presented.