In Dimensional data models, which of these is NOT true regarding Measures在维度建模中,下面关于指标描述哪一项是不正确的?:()?
(A)Measures are found in Fact tables指标可以在事实表中找到
(B)Care must be taken if a measure is a snapshot figure需要特别注意若指标在快照中处理
(C)Measures can always be added across all dimensions指标可以在所有维度表中进行累加
(D)Measures should be numeric and additive指标是数值的同时,也必须是一个累加值
(E)Just because a value is numerical does not mean it is a measure数值并不一定是一个指标 答案解析: 该题考的是维度建模,稍后我做个完整的视频解释,这里稍作简述。Measures can always be added across all dimensions:中的维度表,某种意义上来说,跟参考数据是同义的,如地区维表,这里表是不能累加的,也不含指标相关的内容的,也不能单独使用,必须和事实表关联才能使用的。Measures are found in Fact tables:事实表就是记录过程数据的,如订单数据,所以是可以找到指标相关的信息的Care must be taken if a measure is a snapshot figure:这种中性描述,没错,虽然没把原因写出来剩下两个答案:指标是累加的数值(请参阅《华为数据之道》)


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