Filling blank values in a dataset based on a shared value on a nother column

Hi Anonymous ,

We can add a custom column then remove the origin one to meet your requirement:

let 
  c = [COMPANY]
in 
  if [SFID] = null 
    then Table.Max(Table.SelectRows(#"Changed Type",each [COMPANY]=c),{"SFID"})[SFID] 
    else [SFID]

All the queries are here:

let
    Source = Table.FromRows(Json.Document(Binary.Decompress(Binary.FromText("i45WMlTSUXJ0cgaShkbGSrE60UpGcBEw1xiVawJkODm7AEkTUzOwiClcBMw1AzJc3dzB3FgA", BinaryEncoding.Base64), Compression.Deflate)), let _t = ((type text) meta [Serialized.Text = true]) in type table [INVOICE = _t, COMPANY = _t, SFID = _t]),
    #"Changed Type" = Table.TransformColumnTypes(Source,{{"INVOICE", Int64.Type}, {"COMPANY", type text}, {"SFID", Int64.Type}}),
    #"Added Custom" = Table.AddColumn(#"Changed Type", "SFID_2", each let 
  c = [COMPANY]
in 
  if [SFID] = null 
    then Table.Max(Table.SelectRows(#"Changed Type",each [COMPANY]=c),{"SFID"})[SFID] 
    else [SFID]),
    #"Removed Columns" = Table.RemoveColumns(#"Added Custom",{"SFID"}),
    #"Renamed Columns" = Table.RenameColumns(#"Removed Columns",{{"SFID_2", "SFID"}})
in
    #"Renamed Columns"

Best regards,