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填空题 In the history of database design, three models have been in use: the model, the model, themodel.

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填空题 Each column in a relation is called an____.

填空题 Each row in a relation is called a ____.

填空题 A DBMS has three levels: ,, and .

填空题 The ____level of a DBMS defines the logic view of the data as well as the data model and schema diagrams.