题目内容

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

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Entities and relationships are to be distinguished using the concept of ____________ ____________.

Object-based logical models are used for describing data at the ­­____________ and ____________ levels.

The three widely used record-based logical models are ____________ Model、____________ Model and ____________ Model.

Well known physical data models are ____________ model and ____________ ____________ model.

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