【摘要】 本文以“区域工业污染源数据库应用系统”为例,以数据库的概念结构设计、逻辑结构设计为重点,并引入连接矩阵等工具,从数据库设计方法学角度进行了初步探讨。更多还原

【Abstract】 A data base was disigned for regional industrial pollution sources and the conceptual and logical structures of the data base were studies. E-R graph as well as connective matrices were employed for the design.更多还原