题目内容

Which of the following can data models be used to describe?

A. data
B. data relationships
C. data semantics
D. data constraints

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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

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.