Forum Discussion

Anonymous's avatar
Anonymous
Not applicable
3 years ago
Solved

Transform columns into rows

Hi everyone, all good? I'm trying to transform columns into rows using Power Query for the following example table: (actual table) FatherID--- A B A B Y 10 20 11 13 W 80 50 ...
Need Help
  • tackytechtom's avatar
    tackytechtom
    3 years ago

    Hi Anonymous ,

     

    How about this? Note, I could not name multiple columns with the same name though. 

     

    Before:

     

    After:

     

     

    The trick here was to use unpivot columns 🙂 

    Here the code in Power Query M that you can paste into the advanced editor (if you do not know, how to exactly do this, please check out this quick walkthrough)

    let
    Source = Table.FromRows(Json.Document(Binary.Decompress(Binary.FromText("i45WilTSUTI0ABJGIMLQEEQYK8XqRCuFA5kWIEFTMAHE5kqxsQA=", BinaryEncoding.Base64), Compression.Deflate)), let _t = ((type nullable text) meta [Serialized.Text = true]) in type table [FatherID = _t, A = _t, B = _t, A.1 = _t, B.1 = _t]),
    #"Unpivoted Columns" = Table.UnpivotOtherColumns(Source, {"FatherID", "A.1", "B.1"}, "Attribute", "Value1"),
    #"Unpivoted Columns1" = Table.UnpivotOtherColumns(Source, {"FatherID", "A", "B"}, "Attribute", "Value2"),
    #"Split Column by Delimiter" = Table.SplitColumn(#"Unpivoted Columns1", "Attribute", Splitter.SplitTextByDelimiter(".", QuoteStyle.Csv), {"Attribute", "Attribute.2"}),
    #"Merged Queries" = Table.NestedJoin(#"Unpivoted Columns", {"FatherID", "Attribute"}, #"Split Column by Delimiter", {"FatherID", "Attribute"}, "Split Column by Delimiter", JoinKind.LeftOuter),
    #"Expanded Split Column by Delimiter" = Table.ExpandTableColumn(#"Merged Queries", "Split Column by Delimiter", {"Value2"}, {"Value2"}),
    #"Removed Columns" = Table.RemoveColumns(#"Expanded Split Column by Delimiter",{"A.1", "B.1"})
in
    #"Removed Columns"

     

    Let me know if this helps 🙂

     

    /Tom
    https://www.tackytech.blog/
    https://www.instagram.com/tackytechtom/ 

slorin's avatar
slorin
Super User
3 years ago

Hi,

 

Another solution with Table.Group

 

let
Source = Your_Source,
ID = List.Range(Table.ColumnNames(Source), 1, (Table.ColumnCount(Source)-1)/2 ),
Col_Names = {"ID", "Value1", "Value2"},
Group = Table.Group(Source, {"FatherID"}, 
    {{"Data", each Table.FromColumns( {ID} & List.Split(List.Skip(Table.ToRows(_){0}), List.Count(ID)), Col_Names)}}),
Expand = Table.ExpandTableColumn(Group, "Data", Col_Names, Col_Names)
in
Expand

 

Stéphane