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

[hazaboy9]

Hi Everyone,

Having some problems where I have row level data with duplicates values that I need to find a minimum value for.  In the below screenshot i would like to see a 3rd column that shows the minimum date difference for each "Ctr & Visit Code" value.

Is there a calculation in Power Query that i can use 

[mhossain · Accepted solution]

@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

[Icey · Accepted solution]

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

If this post helps, then please consider Accept it as the solution to help the other members find it more quickly.

[mhossain · Accepted solution]

@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

[amitchandak]

@hazaboy9 ,

refer  if these can help

https://www.youtube.com/watch?v=rqDdnNxSgHQ

https://www.youtube.com/watch?v=qUmTxQHr6nY