New Column with latest value

[mike-germany]

Hi, I have a table with 4 columns: Date, Item-Number, Item-Name, Sales. The Item-Name (of the same Item-Number) changes over time.
-> I want to add a column with Power Query M which adds the latest Item-Name for each row, as below. Thanks your help! Mike

[mike-germany]

I could solve it with a reference table, group by funtion, and merge the tables again afterwards. However I'd still be interested if there isn't a more elegant solution within the original table.

[dax · Accepted solution]

Hi @mike-germany , 

You could try below M code to see whether it works or not

let
    Source = Table.FromRows(Json.Document(Binary.Decompress(Binary.FromText("i45WMjIwMtA31DdU0lEyNISSCn6JuakgtpFSrA5ciRmGEiMg2wRZiaERhhpjINsMRQ3IXCMjCInbJlQl2G1CVYPVJmNjYwiJ2yZUJdhtQlUDtSkWAA==", BinaryEncoding.Base64), Compression.Deflate)), let _t = ((type text) meta [Serialized.Text = true]) in type table [Date = _t, #"Item-Number" = _t, #"Item-Name" = _t, Sales = _t]),
    #"Changed Type" = Table.TransformColumnTypes(Source,{{"Date", type date}, {"Item-Number", Int64.Type}, {"Item-Name", type text}, {"Sales", Int64.Type}}),
    #"Grouped Rows" = Table.Group(#"Changed Type", {"Item-Number"}, {{"max", each List.Max([Date]), type date}, {"all", each _, type table [Date=date, #"Item-Number"=number, #"Item-Name"=text, Sales=number]}}),
    #"Expanded all" = Table.ExpandTableColumn(#"Grouped Rows", "all", {"Date", "Item-Name", "Sales"}, {"Date", "Item-Name", "Sales"}),
    #"Added Custom" = Table.AddColumn(#"Expanded all", "Custom", each if [max]=[Date] then [#"Item-Name"] else null),
    #"Filled Up" = Table.FillUp(#"Added Custom",{"Custom"}),
    #"Removed Columns" = Table.RemoveColumns(#"Filled Up",{"max"})
in
    #"Removed Columns"

Best Regards,
Zoe Zhi

If this post helps, then please consider Accept it as the solution to help the other members find it more quickly.