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credencial's avatar
credencial
Frequent Visitor
5 years ago
Solved

Transforming Data with M

Hi folks,

I have a table data:

 

 

I need create two more columns like this:

 

 

and fill in the START and END columns following the formula:

 

START = END OF PREVIOUS MONTH (in this case the month of september)

END = (START + ENTRANCE) - EXIT

 

The dates are varied, they can comprise several periods according to the user's parameter date filter. I always have the START number for the first month given through a "STARTDATE" measure DAX.

I imagine the path is to do in M, can you give me a light?

Thanks for any help.

Need Help
  • Anonymous's avatar
    Anonymous
    5 years ago

    Hi credencial ,

     

    Here is the whole M syntax:

    let
    Source = Table.FromRows(Json.Document(Binary.Decompress(Binary.FromText("i45WKk4t0DcyUNJRgiBDAwOlWJ1opfzkEoiwKYgwAysAiefll0HELUCEoRFcIiU1GSJhhKQhFgA=", BinaryEncoding.Base64), Compression.Deflate)), let _t = ((type nullable text) meta [Serialized.Text = true]) in type table [Date = _t, Entrance = _t, Exit = _t, End = _t]),
    #"Changed Type" = Table.TransformColumnTypes(Source,{{"Date", type text}, {"Entrance", Int64.Type}, {"Exit", Int64.Type}, {"End", Int64.Type}}),
    #"Added Index" = Table.AddIndexColumn(#"Changed Type", "Index", 0, 1, Int64.Type),
    #"Added Custom" = Table.AddColumn(#"Added Index", "Custom", each try #"Added Index" [End] {[Index] - 1} otherwise null),
    #"Filled Down" = Table.FillDown(#"Added Custom",{"End"}),
    #"Added Custom1" = Table.AddColumn(#"Filled Down", "Custom.1", each if [Index]=0 then [End] else [End]+List.Sum(List.Range(#"Filled Down"[Entrance],1,[Index]))-List.Sum(List.Range(#"Filled Down"[Exit],1,[Index]))),
    #"Removed Columns" = Table.RemoveColumns(#"Added Custom1",{"Custom"}),
    #"Added Custom2" = Table.AddColumn(#"Removed Columns", "Custom", each try #"Added Custom1" [Custom.1]{[Index] - 1} otherwise null),
    #"Removed Columns1" = Table.RemoveColumns(#"Added Custom2",{"Index", "End"}),
    #"Renamed Columns" = Table.RenameColumns(#"Removed Columns1",{{"Custom.1", "End"}, {"Custom", "Start"}})
in
    #"Renamed Columns"

    The final result is this.

     

    Best Regards,

    Stephen Tao

     

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

4 Replies

  • mahoneypat's avatar
    mahoneypat
    Microsoft Employee
    5 years ago

    Here's one way to do it in the query editor.  To see how it works, just create a blank query, open the Advanced Editor and replace the text there with the M code below.  Did you mean to do + Exit - Entrance, since the End date is before the Start date with the formula above?  You can adapt this, if so.

     

    let
    Source = Table.FromRows(Json.Document(Binary.Decompress(Binary.FromText("i45Wyk8u0TcyUNJRMgURZgZKsTrRSnn5ZRBBCxBhaAQRTUlNhogawZTGAgA=", BinaryEncoding.Base64), Compression.Deflate)), let _t = ((type nullable text) meta [Serialized.Text = true]) in type table [Date = _t, Entrance = _t, Exit = _t]),
    #"Added Custom" = Table.AddColumn(Source, "DateForCalc", each "1/"&[Date]),
    #"Changed Type" = Table.TransformColumnTypes(#"Added Custom",{{"Entrance", Int64.Type}, {"Exit", Int64.Type}, {"DateForCalc", type date}}),
    #"Added Custom1" = Table.AddColumn(#"Changed Type", "Start", each Date.EndOfMonth(Date.AddMonths([DateForCalc], -1)), type date),
    #"Added Custom2" = Table.AddColumn(#"Added Custom1", "End", each Date.AddDays([Start], [Entrance] - [Exit]), type date)
in
    #"Added Custom2"

     

    Pat

     

    • credencial's avatar
      credencial
      Frequent Visitor
      5 years ago

      Thanks mahoneypat .

       

      I tested your suggestion, but I didn't get the result. Maybe I didn't explain it right. I need this result:

       

       

      • Anonymous's avatar
        Anonymous
        Not applicable
        5 years ago

        Hi credencial ,

         

        Here is the whole M syntax:

        let
    Source = Table.FromRows(Json.Document(Binary.Decompress(Binary.FromText("i45WKk4t0DcyUNJRgiBDAwOlWJ1opfzkEoiwKYgwAysAiefll0HELUCEoRFcIiU1GSJhhKQhFgA=", BinaryEncoding.Base64), Compression.Deflate)), let _t = ((type nullable text) meta [Serialized.Text = true]) in type table [Date = _t, Entrance = _t, Exit = _t, End = _t]),
    #"Changed Type" = Table.TransformColumnTypes(Source,{{"Date", type text}, {"Entrance", Int64.Type}, {"Exit", Int64.Type}, {"End", Int64.Type}}),
    #"Added Index" = Table.AddIndexColumn(#"Changed Type", "Index", 0, 1, Int64.Type),
    #"Added Custom" = Table.AddColumn(#"Added Index", "Custom", each try #"Added Index" [End] {[Index] - 1} otherwise null),
    #"Filled Down" = Table.FillDown(#"Added Custom",{"End"}),
    #"Added Custom1" = Table.AddColumn(#"Filled Down", "Custom.1", each if [Index]=0 then [End] else [End]+List.Sum(List.Range(#"Filled Down"[Entrance],1,[Index]))-List.Sum(List.Range(#"Filled Down"[Exit],1,[Index]))),
    #"Removed Columns" = Table.RemoveColumns(#"Added Custom1",{"Custom"}),
    #"Added Custom2" = Table.AddColumn(#"Removed Columns", "Custom", each try #"Added Custom1" [Custom.1]{[Index] - 1} otherwise null),
    #"Removed Columns1" = Table.RemoveColumns(#"Added Custom2",{"Index", "End"}),
    #"Renamed Columns" = Table.RenameColumns(#"Removed Columns1",{{"Custom.1", "End"}, {"Custom", "Start"}})
in
    #"Renamed Columns"

        The final result is this.

         

        Best Regards,

        Stephen Tao

         

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