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判断题 The external level of a DBMS interacts directly with the hardware and is concerned with low-level access methods and byte transfer to and from the storage device. ( ) 对 ( ) 错
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判断题 The external level of a DBMS interacts directly with the user. ( ) 对 ( ) 错
判断题 In a hierarchical model, data are organized as an upside down tree. ( ) 对 ( ) 错
判断题 In a hierarchical model, the entities are organized in a graph, where some entities can be accessed through several paths. ( ) 对 ( ) 错
判断题 Each column in a relation is called an attribute. ( ) 对 ( ) 错
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