New Custom Column in power query with the last month of data

[rafavillegas]

Hello Forum!

I have this table in power query:

And I would a conditional table to read last month with data and copy amount value in the new column, see below the answer

Thank you so much in advance.

[v-shex-msft]

Hi @rafavillegas ,

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Xiaoxin Sheng

[spinfuzer · Accepted solution]

let
    Source = Table.FromRows(Json.Document(Binary.Decompress(Binary.FromText("i45WMtM3MtY3MjAyVtJRMjQwMFCK1YlWstQ3tIAJmsIEzfWNTJFVwpXCBM3BYrEA", BinaryEncoding.Base64), Compression.Deflate)), let _t = ((type nullable text) meta [Serialized.Text = true]) in type table [Date = _t, Amount = _t]),
    #"Changed Type" = Table.TransformColumnTypes(Source,{{"Date", type date}, {"Amount", Int64.Type}}),
    add_last_month =
        let last_month = Date.StartOfMonth(List.Max(#"Changed Type"[Date]))
        in Table.AddColumn(#"Changed Type", "Last Month Cost", each if [Date] < last_month then null else [Amount], type number)
in
    add_last_month

[Ashish_Mathur]

Hi,

Why should the answer be 5000 and 7000?  Also, why not create a calculated column formula in DAX?  Why are you trying to do this in Power Query?

[rafavillegas]

Because I create a report with the cost to date and with the cost in the last month.

And I need it in Power query instead of DAX, because later this column has relationships with another column of other data, and with Dax doesn't work right.

[Ashish_Mathur]

Relationships are created in the Data model (not in Power Query) so we can create a calculated column formula.  I still do not understand how you arived at 5000 and 7000 in column 3.