题目内容

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

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

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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

单选题 In the () database model, each entity can be accessed through multiple paths.

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

单选题 The relation is a set of data organized logically as a (n)()-dimensional table.

A. one
B. two
C. three
D. any

单选题 Each column in a relation is called ().

A. an attribute
B. a tuple
C. a union
D. an attitude