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Fda's avatar
Fda
Frequent Visitor
7 years ago
Solved

Sorting rows based on two columns

Hi!   I am struggling with a data exercise and could use some help.   I would like to return the value of column A, based on a grouped value of column B, where the value of column C is the highes...
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  • BekahLoSurdo's avatar
    BekahLoSurdo
    7 years ago

    Hi Fda,

     

    Without seeing your dataset, I'm not sure about the exact performance. If you want to try another way (and compare the two for your particular dataset), this can also be done outside of Power Query by creating a new column with DAX:

     

    ColumnA_IfMax = IF ( CALCULATE ( MAX ( 'Table'[ColumnC] ), ALLEXCEPT ( 'Table', 'Table'[ColumnB] ) ) = 'Table'[ColumnC], 'Table'[ColumnA], BLANK() )

     

     

BekahLoSurdo's avatar
BekahLoSurdo
Resolver IV
7 years ago

Hi Fda,

Try this:

let
    Source = Excel.Workbook(File.Contents("C:\Users\rlosurdo\Desktop\GroupByColumn.xlsx"), null, true),
    Groups_Sheet = Source{[Item="Groups",Kind="Sheet"]}[Data],
    #"Promoted Headers" = Table.PromoteHeaders(Groups_Sheet, [PromoteAllScalars=true]),
    #"Changed Type" = Table.TransformColumnTypes(#"Promoted Headers",{{"ColumnA", Int64.Type}, {"ColumnB", Int64.Type}, {"ColumnC", Int64.Type}}),
    #"Added Custom" = Table.AddColumn(#"Changed Type", "MaxGroupValue", each let group = [ColumnB] in
        List.Max(Table.SelectRows(#"Changed Type", each [ColumnB] = group) [ColumnC])),
    #"Filtered Rows" = Table.SelectRows(#"Added Custom", each [MaxGroupValue] = [ColumnC]),
    #"Removed Other Columns" = Table.SelectColumns(#"Filtered Rows",{"ColumnA"})
in
    #"Removed Other Columns"

  • Fda's avatar
    Fda
    Frequent Visitor
    7 years ago

    Thank you for taking your time, and it looks like its working!

     

    Is it a heavy calculation for it to make? It's running pretty slow for me, and I've got a lot of rows left?

    • BekahLoSurdo's avatar
      BekahLoSurdo
      Resolver IV
      7 years ago

      Hi Fda,

       

      Without seeing your dataset, I'm not sure about the exact performance. If you want to try another way (and compare the two for your particular dataset), this can also be done outside of Power Query by creating a new column with DAX:

       

      ColumnA_IfMax = IF ( CALCULATE ( MAX ( 'Table'[ColumnC] ), ALLEXCEPT ( 'Table', 'Table'[ColumnB] ) ) = 'Table'[ColumnC], 'Table'[ColumnA], BLANK() )

       

       

      • Fda's avatar
        Fda
        Frequent Visitor
        7 years ago

        You are a legend, that is exactly what I was looking for!

         

        Thank you very much!