So I have this so far
所以到目前为止我有这个
=SUM(IF(FREQUENCY(MATCH(B2:B10,B2:B10,0),MATCH(B2:B10,B2:B10,0))>0,1))
=SUM(IF(F
阅读背景：
counting unique values in 1 column only if within 7 days of 2nd date column
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