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hcze's avatar
hcze
Icon for Helper II rankHelper II
1 year ago
Solved

Loop through a table using M

Hi all,   I am trying to create function in Power Query to build a string based on values in a table.   My table is   Code Key Value Query 1 Key1 name Query 1 Key2 address Que...
Need Help
  • MarkLaf's avatar
    MarkLaf
    1 year ago

    This function meets your reqs I think.

     

    CombineKeyValue

    (InputTable as table, CodeValue as text) as text =>
    [
        TargetRows = Table.SelectRows(
            InputTable, each [Code] = CodeValue and Text.Trim([Value]) <> "" and [Value] <> null
        ),
        Parts = Table.TransformRows(TargetRows, each [Key] & "=" & [Value]),
        Output = Text.Combine(Parts, ",")
    ][Output]

     

    If we assume the name of your original table/query is "Original", then we can invoke like so:

     

     

    Output:

     

     

     

     

ronrsnfld's avatar
ronrsnfld
Icon for Super User rankSuper User
1 year ago

Perhaps, if a null in the Value column = EOF, then:

 

let
    Source = Table.FromRows(Json.Document(Binary.Decompress(Binary.FromText("i45WCixNLapUMFTSUfJOrQRReYm5qUqxOmgyRkAqMSWlKLW4GEnSCKc2IzzaoHLGQEopNhYA", BinaryEncoding.Base64), Compression.Deflate)), let _t = ((type nullable text) meta [Serialized.Text = true]) in type table [Code = _t, Key = _t, Value = _t]),
    #"Changed Type" = Table.TransformColumnTypes(Source,{{"Code", type text}, {"Key", type text}, {"Value", type text}}),
    
    String = [a=#"Changed Type"[Key],
              b=#"Changed Type"[Value],
              c=List.Zip({a,b}),
              d=List.Select(c, each  not (_{1} = "")),
              e=List.Transform(d, each _{0} & "=" & _{1}),
              f=Text.Combine(e,", ")][f]
in
    String

 

Source Table:

 

Results:

Key1=name, Key2=address, Key1=name, Key2=address