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填空题 Each column in a relation is called an____.

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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.

填空题 The ____is language standardized by ANSI and ISO for use on relation database.