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ChrisBroome's avatar
ChrisBroome
Frequent Visitor
5 years ago
Solved

How to reference and copy data from one row to another

Hi, I'm relatively new to PowerBI and PowerQuery, so apologies if the terminology below is incorrect. I'm trying to do something that I feel 'should' be easy;   I have data set out as follows;   ...
Need Help
  • Jimmy801's avatar
    Jimmy801
    5 years ago

    Hello ChrisBroome 

     

    I included now some errorhandling

    let
Source = Csv.Document(File.Contents("C:\Users\Chris.Broome\Downloads\TISReport_15-20201023_130241.csv"),[Delimiter=",", Columns=50, Encoding=65001, QuoteStyle=QuoteStyle.Csv]),
#"Changed Type" = Table.TransformColumnTypes(Source,{{"Column1", type text}, {"Column2", type text}, {"Column3", type text}, {"Column4", type text}, {"Column5", type text}, {"Column6", type text}, {"Column7", type text}, {"Column8", type text}, {"Column9", type text}, {"Column10", type text}, {"Column11", type text}, {"Column12", type text}, {"Column13", type text}, {"Column14", type text}, {"Column15", type text}, {"Column16", type text}, {"Column17", type text}, {"Column18", type text}, {"Column19", type text}, {"Column20", type text}, {"Column21", type text}, {"Column22", type text}, {"Column23", type text}, {"Column24", type text}, {"Column25", type text}, {"Column26", type text}, {"Column27", type text}, {"Column28", type text}, {"Column29", type text}, {"Column30", type text}, {"Column31", type text}, {"Column32", type text}, {"Column33", type text}, {"Column34", type text}, {"Column35", type text}, {"Column36", type text}, {"Column37", type text}, {"Column38", type text}, {"Column39", type text}, {"Column40", type text}, {"Column41", type text}, {"Column42", type text}, {"Column43", type text}, {"Column44", type text}, {"Column45", type text}, {"Column46", type text}, {"Column47", type text}, {"Column48", type text}, {"Column49", type text}, {"Column50", type text}}),
#"Renamed Columns" = Table.RenameColumns(#"Changed Type",{{"Column1", "ID"}, {"Column2", "Title"}, {"Column3", "Link ID"}}),
#"PreviousStep" = Table.TransformColumnTypes(#"Renamed Columns",{{"ID", Int64.Type}, {"Title", type text}, {"Link ID", Int64.Type}}),
AddColumn = Table.AddColumn
(
PreviousStep,
"Link Title",
each try Table.SelectRows(PreviousStep, (sel)=> sel[ID]=_[Link ID])[Title]{0} otherwise null
)
in
AddColumn

     

    Copy paste this code to the advanced editor in a new blank query to see how the solution works.

    If this post helps or solves your problem, please mark it as solution (to help other users find useful content and to acknowledge the work of users that helped you)
    Kudoes are nice too

    Have fun

    Jimmy

AlB's avatar
AlB
Community Champion
5 years ago

Hi ChrisBroome 

You can do that in DAX or PQ. For the latter, place the following M code in a blank query to see the steps:

let
    Source = Table.FromRows(Json.Document(Binary.Decompress(Binary.FromText("i45WMjQyVtJRciwoyEkF0oZGpkqxOtFgWkfJKTEPCIEMqJg5kOlflJiXngoWiwUA", BinaryEncoding.Base64), Compression.Deflate)), let _t = ((type nullable text) meta [Serialized.Text = true]) in type table [ID = _t, Title = _t, #"Link ID" = _t]),
    #"Changed Type" = Table.TransformColumnTypes(Source,{{"ID", Int64.Type}, {"Title", type text}, {"Link ID", Int64.Type}}),
    #"Added Custom" = Table.AddColumn(#"Changed Type", "Custom", each try #"Changed Type"[Title]{List.PositionOf(#"Changed Type"[ID], [Link ID])} otherwise null)
in
    #"Added Custom"

 Please mark the question solved when done and consider giving a thumbs up if posts are helpful.

Contact me privately for support with any larger-scale BI needs, tutoring, etc.

Cheers 

  • ChrisBroome's avatar
    ChrisBroome
    Frequent Visitor
    5 years ago

    Hi AlB,

     

    thanks for the help.

     

    I get a 'token Eof expected' error when entering this information. I've tried to add a custom column and entered this as the formula. is that correct? it highlights the #changed type as being the error (in red below);

    let
    Source = Table.FromRows(Json.Document(Binary.Decompress(Binary.FromText("i45WMjQyVtJRciwoyEkF0oZGpkqxOtFgWkfJKTEPCIEMqJg5kOlflJiXngoWiwUA", BinaryEncoding.Base64), Compression.Deflate)), let _t = ((type nullable text) meta [Serialized.Text = true]) in type table [ID = _t, Title = _t, #"Link ID" = _t]),
    #"Changed Type" = Table.TransformColumnTypes(Source,{{"ID", Int64.Type}, {"Title", type text}, {"Link ID", Int64.Type}}),
    #"Added Custom" = Table.AddColumn(#"Changed Type", "Custom", each try #"Changed Type"[Title]{List.PositionOf(#"Changed Type"[ID], [Link ID])} otherwise null)
    in
    #"Added Custom"