Concatenate specific columns with prefix without null

Hi Anonymous ,

If you could count how many the columns that without "SEARCH_"  prefix and make sure they are sorted before columns that with "SEARCH_"  prefix, I'd suggest you use CNENFRNL 's method by just change the number in List.Skip function, as shown below. I think it's the most efficient.

Otherwise, you may follow my workaround which may be  a little complex.

1. Add a Index column to the original table

2. Duplicate the original table to add a new table --> Select Index column, unpivot other columns

3. Filter all rows when Attribute column contains "SEARCH_" and Value <>"null" , then only remains Index and Value columns

4.Group Values by Index column and then renamed "FOUND":

Here is the whole M syntax of the New Table:

let
    Source = Table.FromRows(Json.Document(Binary.Decompress(Binary.FromText("i45WclTSUXJUKCzNTM5WSCrKL8/T09MDChkY6gGRkYGREZCTV5qTg0bF6kQrORGv1c3QyNgEpNzJGazVmQitjlisdCHBSmMTM1O43lgA", BinaryEncoding.Base64), Compression.Deflate)), let _t = ((type nullable text) meta [Serialized.Text = true]) in type table [Topic = _t, Summary = _t, Date = _t, SEARCH_A = _t, SEARCH_my_value = _t, SEARCH_text = _t]),
    #"Changed Type" = Table.TransformColumnTypes(Source,{{"Topic", type text}, {"Summary", type text}, {"Date", type date}, {"SEARCH_A", type text}, {"SEARCH_my_value", type text}, {"SEARCH_text", type text}}),
    #"Added Index" = Table.AddIndexColumn(#"Changed Type", "Index", 1, 1, Int64.Type),
    #"Unpivoted Other Columns" = Table.UnpivotOtherColumns(#"Added Index", {"Index"}, "Attribute", "Value"),
    #"Added Custom1" = Table.AddColumn(#"Unpivoted Other Columns", "Custom", each Text.Contains([Attribute],"SEARCH") and [Value]<>"null"),
    #"Filtered Rows" = Table.SelectRows(#"Added Custom1", each ([Custom] = true)),
    #"Removed Columns1" = Table.RemoveColumns(#"Filtered Rows",{"Custom","Attribute"}),
    #"Grouped Rows" = Table.Group(#"Removed Columns1", {"Index"}, {{"Count", each Text.Combine([Value] , ","), type text}}),
    #"Renamed Columns" = Table.RenameColumns(#"Grouped Rows",{{"Count", "FOUND"}})
in
    #"Renamed Columns"

5. Back to the original table, Merge Queries --> Expand columns:

Final output:

Best Regards,
Eyelyn Qin
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