Costum Column: Build a string with a separator based on the number in another column

Hi gehe_muc ,

Here you go. Copy and paste this M-code in a blank query and you'll be able to see the steps.

let
    Source = Table.FromRows(Json.Document(Binary.Decompress(Binary.FromText("i45WMlWK1YlWMgaT5mDSEExaKsXGAgA=", BinaryEncoding.Base64), Compression.Deflate)), let _t = ((type nullable text) meta [Serialized.Text = true]) in type table [Number = _t]),
    #"Changed Type" = Table.TransformColumnTypes(Source,{{"Number", Int64.Type}}),
    #"Added Custom" = Table.AddColumn(#"Changed Type", "Custom", each {1..[Number]}),
    #"Extracted Values" = Table.TransformColumns(#"Added Custom", {"Custom", each Text.Combine(List.Transform(_, Text.From), ";"), type text})
in
    #"Extracted Values"

Final result

Main idea is to create a list of numbers starting from 1 to <value_in_column>

Kind regards,

Rohit

Please mark this answer as the solution if it resolves your issue.
Appreciate your kudos! 🙂