Power Query | COALESCE Table and Replace all first row values in Table

Hi cflynn_29 ,

According to your description, here's my solution.

1.Add an index column.

2.Add a custom column.

Custom = if[Index]=0 then List.First(List.RemoveItems(#"Added Index"[Column3],{""})) else [Column3]

Then the title reaches the first row.

Remove Index and Column3, get the expected result.

Here's the code.

let
    Source = Table.FromRows(Json.Document(Binary.Decompress(Binary.FromText("i45WCsksyUlV0oHTSrE60UogGso0BDJMYRwjIMMMrhgkYgzkmcOkTYAMCyC2VIqNBQA=", BinaryEncoding.Base64), Compression.Deflate)), let _t = ((type nullable text) meta [Serialized.Text = true]) in type table [Column1 = _t, Column2 = _t, Column3 = _t]),
    #"Changed Type" = Table.TransformColumnTypes(Source,{{"Column1", type text}, {"Column2", type text}, {"Column3", type text}}),
    #"Added Index" = Table.AddIndexColumn(#"Changed Type", "Index", 0, 1, Int64.Type),
    #"Added Custom" = Table.AddColumn(#"Added Index", "Custom", each if[Index]=0 then List.First(List.RemoveItems(#"Added Index"[Column3],{""})) else [Column3]),
    #"Removed Columns" = Table.RemoveColumns(#"Added Custom",{"Column3", "Index"})
in
    #"Removed Columns"

I attach my sample below for reference.

Best Regards,
Community Support Team _ kalyj

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