obtaining core meaning in Chinese

取得岩心

Generally , the research of knowledge discovery is based on relational database , database reduction algorithm based on relational database directly obtains core of database , attributes reduction and rule reduction by operator in relational database . it is a simple and effective . essentially , rough relational database model in this paper , which extending classical rough sets model , is a multi - valued information system
知识发现研究的实施对象多为关系数据库,基于关系数据库操作的数据库约简算法利用关系数据库的操作算子直接对数据库进行求核、属性约简和规则约简,该方法充分发挥数据库操作的简便高效性,使得数据库约简算法简单易实现。