Power Query - List.Min for one column based on duplicate values in another column

hazaboy9 

Try below code in your advance editor/powerquery, it should work.

let
Source = Table.FromRows(Json.Document(Binary.Decompress(Binary.FromText("i45WMjRQ0lEyVIrVATKN4ExLOMsCIQ1SaQRhGsKZxghREygzFgA=", BinaryEncoding.Base64), Compression.Deflate)), let _t = ((type nullable text) meta [Serialized.Text = true]) in type table [#"Date Difference" = _t, #"Ctr & Visit Code" = _t]),
#"Changed Type" = Table.TransformColumnTypes(Source,{{"Date Difference", Int64.Type}, {"Ctr & Visit Code", Int64.Type}}),
#"Grouped Rows" = Table.Group(#"Changed Type", {"Ctr & Visit Code"}, {{"Count", each _, type table [Date Difference=nullable number, #"Ctr & Visit Code"=nullable number]}}),
#"Added Custom1" = Table.AddColumn(#"Grouped Rows", "Custom.1", each List.First(List.Sort(Table.Column([Count],"Date Difference")))),
#"Expanded Count" = Table.ExpandTableColumn(#"Added Custom1", "Count", {"Date Difference"}, {"Count.Date Difference"})
in
#"Expanded Count"

Let me know if above makes sense

Hi hazaboy9 ,

Try to use "Group" by the "Ctr & Visit Code" column and return a column of min value of "Date Difference" column.

Best Regards,

Icey

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