Add new column based on whether another column's value is top N

Hi Anonymous ,

Try this:

if
List.Contains(
    List.FirstN(
        List.Sort(chgTypes[Score], Order.Descending),
        10
    ),
    [Score]
)
then "Y" else "N"

Full query:

let
    Source = Table.FromRows(Json.Document(Binary.Decompress(Binary.FromText("Pc3LCcBACATQXvYcwhj/tSzpv40sRPX0UGbce+HOyFzv9TOGUCuGGDfZvWjZSztTVPdoGp6iTCsn9Z3BUiTTIahTcKemoj9ApgFQHvKJvR8=", BinaryEncoding.Base64), Compression.Deflate)), let _t = ((type nullable text) meta [Serialized.Text = true]) in type table [Score = _t]),
    chgTypes = Table.TransformColumnTypes(Source,{{"Score", type number}}),
    addIsTop10 = Table.AddColumn(chgTypes, "isTop10", each if
List.Contains(
    List.FirstN(
        List.Sort(chgTypes[Score], Order.Descending),
        10
    ),
    [Score]
)
then "Y" else "N")
in
    addIsTop10

Output:

Pete