DATEDIFF('day', LOOKUP(MIN([Order Date]),-1), MIN([Order Date]))
DATEDIFF() 函数将查找指定日期部分的数量,在本例中,将查找两个日期之间的天数。开始日期为 LOOKUP(MIN([Order Date]),-1),该函数将返回前一行的日期。
可以采用不同的方式计算表函数,以便允许对计算进行进一步自定义。在此示例的步骤 8 中,我们将重新开始为每个客户计数。有关可更改的表函数的详细信息,请参见使用表计算转换值。
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