Calculated column to avoid duplicate UID

Hi unnijoy ,

Try like below:

let
Source = Table.FromRows(Json.Document(Binary.Decompress(Binary.FromText("i45WMjIAQmMlHTADRBkrxepQT9jQyAQibAiiTAgKmyIJm+IUjgUA", BinaryEncoding.Base64), Compression.Deflate)), let _t = ((type nullable text) meta [Serialized.Text = true]) in type table [Country = _t, Category = _t, Year = _t]),
#"Changed Type" = Table.TransformColumnTypes(Source,{{"Country", type text}, {"Category", type text}, {"Year", Int64.Type}}),
#"Grouped Rows" = Table.Group(#"Changed Type", {"Country", "Category"}, {{"Rows", each _, type table [Country=text, Category=text, Year=number, Value=number]}}),
Indexed = Table.TransformColumns(#"Grouped Rows", {{"Rows", each Table.AddIndexColumn(_,"GroupIndex", 1, 1)}}),
#"Expanded Rows" = Table.ExpandTableColumn(Indexed, "Rows", {"Year", "GroupIndex"}, {"Year", "GroupIndex"}),
    #"Renamed Columns" = Table.RenameColumns(#"Expanded Rows",{{"Country", "UID"}, {"Year", "ID"}, {"Category", "Year"}})
in
    #"Renamed Columns"

Final ID = IF(Table1[GroupIndex] = "1",Table1[UID],BLANK())

If the problem is still not resolved, please provide detailed error information and let me know immediately. Looking forward to your reply.

Best Regards,
Henry

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