题目内容

Which of the following models can be used to describe object-based logical models?

A. semantic data model
B. entity-relationship model
C. physical data model

查看答案

搜索结果不匹配？点我反馈

更多问题

What are the possible relationships between two entity sets?

A. one-to-one
B. one-to-many
C. many-to-one
D. many-to-many

The data models are divided into three classes： models, models and models.

An ____________ is an object, which can be uniquely distinguished from other objects.

The set of all entities of the same type and relationships of the same type are termed as and respectively.