Having the constraints defined in the database allows DB2 to know relationships between tables and in some cases allows it to select better access plans based on that knowledge.
在数据库中定义约束使DB 2可以知道表之间的关系，并且在某些情况下允许DB 2根据这样的知识选择更好的访问计划。
Based on the work stated above, a prototype system that can utilize multi-extending concept lattice classification knowledge discovery in database is implemented.
在上述研究工作的基础上，实现了基于多扩展概念格的分类知识发现原型系统。
Some methods for dividing continuous attributes in KDD (knowledge discovery in database) and a method based on VDM (value difference metric) are presented.
介绍了在数据库知识发现(KDD)中将连续属性离散化的一些方法，并提出使用值差分度量离散化的算法。
应用推荐