Excel read duplicate rows and compare columns data to those rows

[ppr (Peter Preuss)]

find some starter help here:
FindDupsUniquesFirstFromGroup_By1Col.xaml (9.3 KB)

as it using the groupby approach also get some introduction on this here:

[HowTo] Overview on different options for grouping data and processing the groups

This HowTo introduces on the different options for grouping data from a datatable in order to process the grouped data. Introduction Grouping data and processing the grouped data is a common scenario e.g. when the grouped data is to aggregate like summing up, find maximum, get the average or concatening items. Lets have a look on following data: [grafik] A possible scenario could be: Create a report containing following information: the region code the sum of CaseCount per RegionCode t…