Assign identifier to rows using multiple columns

Hello Anonymous 

 

you can Fill-down the SSN-column, Group by Name and SSN and add a index column. Expand the grouped table afterwards. Here the M-code

let
    Source = Table.FromRows(Json.Document(Binary.Decompress(Binary.FromText("i45W8krMS1VwyU9V0lEyhAGlWB0UCSMYQJdA05GfkQeVMIYBdAkFpdhYAA==", BinaryEncoding.Base64), Compression.Deflate)), let _t = ((type nullable text) meta [Serialized.Text = true]) in type table [Name = _t, SSN = _t]),
    #"Changed Type" = Table.TransformColumnTypes(Source,{{"Name", type text}, {"SSN", Int64.Type}}),
    #"Filled Down" = Table.FillDown(#"Changed Type",{"SSN"}),
    #"Grouped Rows" = Table.Group(#"Filled Down", {"Name", "SSN"}, {{"AllRows", each _, type table [Name=text, SSN=number]}}),
    #"Removed Other Columns" = Table.SelectColumns(#"Grouped Rows",{"AllRows"}),
    #"Added Index" = Table.AddIndexColumn(#"Removed Other Columns", "Index", 1, 1),
    #"Expanded AllRows" = Table.ExpandTableColumn(#"Added Index", "AllRows", {"Name", "SSN"}, {"Name", "SSN"})
in
    #"Expanded AllRows"

 

Copy paste this code to the advanced editor in a new blank query to see how the solution works.

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Have fun

Jimmy