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The five common aggregation rules are: total, average, count, max, min. Which of the following statements is correct?
A. The total rule directly adds up all measure values under the dimension item
B. The count rule can be applied to any field in the table structure data
C. The max and min rules are generally represented by MAX and MIN functions
D. The average rule can directly use the AVERAGE function
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Total is adding up measure values under each dimension item; Count typically uses primary key; Average should be Total/Count to avoid traps; AVERAGE calculates average of primary key.

正確答案是:A, B, C, D。

以下是對每個(gè)選項(xiàng)的專業(yè)分析:

A: The total rule directly adds up all measure values under the dimension item
分析:總計(jì)規(guī)則(total rule)是將維度項(xiàng)下的所有度量值直接相加。因此,這個(gè)選項(xiàng)是正確的。

B: The count rule can be applied to any field in the table structure data
分析:計(jì)數(shù)規(guī)則(count rule)可以應(yīng)用于表結(jié)構(gòu)數(shù)據(jù)中的任何字段。計(jì)數(shù)規(guī)則用于計(jì)算記錄的數(shù)量,而不考慮字段的類型。因此,這個(gè)選項(xiàng)是正確的。

C: The max and min rules are generally represented by MAX and MIN functions
分析:最大值和最小值規(guī)則(max and min rules)通常通過MAX和MIN函數(shù)來表示。這些函數(shù)用于找到字段中的最大值和最小值。因此,這個(gè)選項(xiàng)是正確的。

D: The average rule can directly use the AVERAGE function
分析:平均值規(guī)則(average rule)可以直接使用AVERAGE函數(shù)來計(jì)算字段的平均值。因此,這個(gè)選項(xiàng)是正確的。

綜上所述,所有選項(xiàng)A, B, C, D都是正確的。