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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
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判断题 Each column in a relation is called an attribute. ( ) 对 ( ) 错
判断题 Each row in a relation is called a tuple. ( ) 对 ( ) 错
判断题 The number of rows in a relation is its cardinality. ( ) 对 ( ) 错
判断题 In a fragmented distributed database, data are localized. Locally used data are stored on the corresponding site. ( ) 对 ( ) 错
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