Forum Discussion

Syndicate_Admin's avatar
Syndicate_Admin
Administrator
2 years ago
Solved

insert multiple columns that subtract previous columns

Hello - I have 50+ columns that I need to calculate the difference after every 2 columns. Currently I appended my tables in Power Query and it looks like this:  DRAFT   ACTUAL   DRAFT   ACTUAL...
  • Anonymous's avatar
    Anonymous
    2 years ago

    Hi ,

    Please refer to this:

    let
    Source = Table.FromRows(Json.Document(Binary.Decompress(Binary.FromText("JYqxDQAwCMN+ydyhQOkziP/fKEkXK5FdBdtYsBy4lmCDCPQq0Bzeb8lU7dIsnYkEcVjfi+4H", BinaryEncoding.Base64), Compression.Deflate)), let _t = ((type nullable text) meta [Serialized.Text = true]) in type table [DRAFT = _t, ACTUAL = _t, DRAFT.1 = _t, ACTUAL.1 = _t, DRAFT.2 = _t, ACTUAL.2 = _t]),
    ColumnNames = Table.ColumnNames(Source),
    ChangeType = Table.TransformColumnTypes(Source, List.Transform(ColumnNames, each {_, type number})),
    AddDiffColumns = List.Accumulate(
        List.Zip({{0..List.Count(ColumnNames)-1}, ColumnNames}),
        ChangeType,
        (state, current) => 
            if Number.Mod(current{0}, 2) = 1 then 
                let
                    diffColumnName = "DIFF" & Text.From(Number.IntegerDivide(current{0}, 2) + 1),
                    draftColumnName = ColumnNames{current{0}-1},
                    actualColumnName = current{1},
                    addedDiffColumn = Table.AddColumn(state, diffColumnName, each Record.Field(_, draftColumnName) - Record.Field(_, actualColumnName), type number)
                in
                    addedDiffColumn
            else 
                state
    )
in
    AddDiffColumns



    Best Regards,
    Gao
    Community Support Team

     

    If there is any post helps, then please consider Accept it as the solution  to help the other members find it more quickly.
    If I misunderstand your needs or you still have problems on it, please feel free to let us know. Thanks a lot!

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Syndicate_Admin's avatar
Syndicate_Admin
Administrator
2 years ago

I should add that each of my files has a different number of columns as well. So if I can automate to add this difference column for any number of iterations as there is data, that is what I want to do.

  • Anonymous's avatar
    Anonymous
    Not applicable
    2 years ago

    Hi ,

    Please refer to this:

    let
    Source = Table.FromRows(Json.Document(Binary.Decompress(Binary.FromText("JYqxDQAwCMN+ydyhQOkziP/fKEkXK5FdBdtYsBy4lmCDCPQq0Bzeb8lU7dIsnYkEcVjfi+4H", BinaryEncoding.Base64), Compression.Deflate)), let _t = ((type nullable text) meta [Serialized.Text = true]) in type table [DRAFT = _t, ACTUAL = _t, DRAFT.1 = _t, ACTUAL.1 = _t, DRAFT.2 = _t, ACTUAL.2 = _t]),
    ColumnNames = Table.ColumnNames(Source),
    ChangeType = Table.TransformColumnTypes(Source, List.Transform(ColumnNames, each {_, type number})),
    AddDiffColumns = List.Accumulate(
        List.Zip({{0..List.Count(ColumnNames)-1}, ColumnNames}),
        ChangeType,
        (state, current) => 
            if Number.Mod(current{0}, 2) = 1 then 
                let
                    diffColumnName = "DIFF" & Text.From(Number.IntegerDivide(current{0}, 2) + 1),
                    draftColumnName = ColumnNames{current{0}-1},
                    actualColumnName = current{1},
                    addedDiffColumn = Table.AddColumn(state, diffColumnName, each Record.Field(_, draftColumnName) - Record.Field(_, actualColumnName), type number)
                in
                    addedDiffColumn
            else 
                state
    )
in
    AddDiffColumns



    Best Regards,
    Gao
    Community Support Team

     

    If there is any post helps, then please consider Accept it as the solution  to help the other members find it more quickly.
    If I misunderstand your needs or you still have problems on it, please feel free to let us know. Thanks a lot!

    How to get your questions answered quickly --  How to provide sample data in the Power BI Forum