Cumulative sum in Power query editor

Anonymous , refer this blog for power query running total

https://www.myonlinetraininghub.com/quickly-create-running-totals-in-power-query

Hi Anonymous 

You can try these steps.

Add Index to your query and create a Custom column

Or you can use following M query in the Advanced Editor:

let

    Source = Table.FromRows(Json.Document(Binary.Decompress(Binary.FromText("i45W8ssv0zUyMDJQ0lEyM7LUMzdVitWJVnJJTYaJGhrpGZuDBb0S80CChkBBYwtLPRNjsKhbahJM1NDAzFTPwgQs7JtYBBc2N9EzApobCwA=", BinaryEncoding.Base64), Compression.Deflate)), let _t = ((type nullable text) meta [Serialized.Text = true]) in type table [YearMonth = _t, Amount = _t]),

    #"Added Index" = Table.AddIndexColumn(Source, "Index", 1, 1, Int64.Type),

    #"Changed Type" = Table.TransformColumnTypes(#"Added Index",{{"Amount", type number}}),

    #"Added Custom" = Table.AddColumn(#"Changed Type", "Running Total", each List.Sum(List.FirstN(#"Changed Type"[Amount],[Index])))

in

#"Added Custom"

The result looks like this:

For more details, you can refer the attached pbix file. For further understanding running total in Power Query, you can refer these links:

Quickly Create Running Totals in Power Query

Grouped running total with Power Query M

Best Regards

Caiyun Zheng

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