Forum Discussion

Arnoh's avatar
Arnoh
Helper III
3 years ago

finding first record

Hi I have the following issue:   I have a table as below     id source_id   100     101 100   102     103 102   104 101   105 104       I want to find th...
finding first record
iterating
ThxAlot's avatar
ThxAlot
Super User
3 years ago

Use recursive function in PQ

 

 

let
    Fx = (id, src) =>
    let pos = List.PositionOf(ID, src)
    in if pos > -1 then Fx(ID{pos}, Src{pos}) else id,

    Source = Table.FromRows(Json.Document(Binary.Decompress(Binary.FromText("i45WMjQwUNJRUorVATENgUyQAIRnhJAwBksYQXkmYJ4hlGcK5pkoxcYCAA==", BinaryEncoding.Base64), Compression.Deflate)), let _t = ((type nullable text) meta [Serialized.Text = true]) in type table [id = _t, source_id = _t]),
    #"Changed Type" = Table.TransformColumnTypes(Source,{{"id", Int64.Type}, {"source_id", Int64.Type}}),
    ID = #"Changed Type"[id], src=#"Changed Type"[source_id],
    
    Traced = Table.AddColumn(#"Changed Type", "Root", each fx([id], [source_id]))
in
    Traced

 

 

 

  • Arnoh's avatar
    Arnoh
    Helper III
    3 years ago

    Hi Thanx for your reaction,

     

    I can't get it working. I did try to copy your code in power query. 

    Can you add extra information on how to create the recursive function in Power Query? 

     

    Thanx