题目内容

单选题 The ()level of a three-level DBMS architecture defines the logical view of the data.

A. external
B. conceptual
C. internal
D. physical

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单选题 The data model and the schema of a DBMS are often defined in the () level.

A. external
B. conceptual
C. internal
D. physical

单选题 In a three-level DBMS architecture, the ()level interacts directly with the users.

A. external
B. conceptual
C. internal
D. physical

单选题 Of the various database models, the() model is the most prevalent today.

A. hierarchical
B. network
C. relational
D. linked list

单选题 The () database model arranges its data in the form of an inverted tree.

A. hierarchical
B. network
C. relational
D. linked list