数据库中objects,classes,associations,generalizations,aggregations是什么意思
来源:学生作业帮助网 编辑:作业帮 时间:2024/06/30 19:37:23
![数据库中objects,classes,associations,generalizations,aggregations是什么意思](/uploads/image/z/14124458-2-8.jpg?t=%E6%95%B0%E6%8D%AE%E5%BA%93%E4%B8%ADobjects%2Cclasses%2Cassociations%2Cgeneralizations%2Caggregations%E6%98%AF%E4%BB%80%E4%B9%88%E6%84%8F%E6%80%9D)
数据库中objects,classes,associations,generalizations,aggregations是什么意思
数据库中objects,classes,associations,generalizations,aggregations是什么意思
数据库中objects,classes,associations,generalizations,aggregations是什么意思
objects:对象 classes:类 associations,:关联(表示一种关系)
generalizations:概括 aggregations:聚合(是一种函数)
objects, classes, associations, generalizations,aggregations
对象,类,关联,概括,聚合