基于粗糙关系数据库的粗糙数据查询

Rough Data Querying of Rough Relation Database Based on Rough Set

以粗糙关系数据库模型 (RRDM)为背景 ,从分解原理、投影原理、粗糙关系数据库 (RRDB)的可定义性及上、下近似几方面讨论了RRDB的查询理论 ,并以此为基础提出了一种新的RRDB查询方法———粗糙数据查询 .我们把粗糙数据查询分为精确查询、粗糙完全查询、粗糙组合查询三类 ,并从这三方面对粗糙数据查询进行了讨论与仿真实验 。

Based on RRDM(Rough Relational Database Model), a querying theory of RRDB (Rough Relational Database) is analyzed through decomposition principle, projection principle, definability of RRDB and lower approximation and upper approximation. A new querying method based on RRDB querying theory, rough data querying of RRDB is presented. The rough data querying is classified into three kinds: crisp querying, rough complete querying and rough combinatorial querying. In addition, the rough data querying is discussed through three aspects and some computational simulation is performed. The simulation results show the feasibility and correctness of the proposed method.