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Anonymous's avatar
Anonymous
Not applicable
5 years ago
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Table.Group possible to group except certain columns?

Hi all, 

 

I am sorry if this is a question asked before, but I can't find it. 

 

I use a Table.Group function in Power Query to group my table on three summarizations. But the table I am extracting from gets new attributes on a regular basis. Now I have to manual add these columns to the first part of the Table.Group function. 

 

Is there a possibility to add something like a Table.Group except the summarizations Lists? So when a new column gets added to the table in the datamart, and my dataset is refreshed, I don't have to add this manually?

 

Thanks!

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  • Jakinta's avatar
    Jakinta
    5 years ago
    Cols = Table.ColumnNames(PreviousStep)
SumCols = {"Sum1","Sum2","Sum3"} // hardcoded or apply some filter to Cols list
GroupCols = List.Difference(Cols, SumCols)
Group = Table.Group ( PreviousStep, GroupCols, List.Transform ( SumCols, (Col)=> {Col, each List.Sum(_[Col]), type number}) )

2 Replies

  • Jakinta's avatar
    Jakinta
    Solution Sage
    5 years ago
    Cols = Table.ColumnNames(PreviousStep)
SumCols = {"Sum1","Sum2","Sum3"} // hardcoded or apply some filter to Cols list
GroupCols = List.Difference(Cols, SumCols)
Group = Table.Group ( PreviousStep, GroupCols, List.Transform ( SumCols, (Col)=> {Col, each List.Sum(_[Col]), type number}) )
    • Anonymous's avatar
      Anonymous
      Not applicable
      5 years ago

      Hi, thanks for this reaction. 

       

      unfortunately, I run into an error:

       

      Expression.Error: The column '_Col' of the table wasn't found. Details: _Col

       

      I am not sure what is going wrong here, Col should not be a column but should represent the columns in SumCols of course..

       

      --edit--

      If I replace the List.Transform part with the individual Sum expressions (so I use the columns instead of the list), it works.. 

       

      Thanks for the first part anyway, this was the most needed!