AddRankColumn only when a condition exists

[pbi_throw_away]

By customer ID, I am trying to rank order records but only when columnA = true. If not true/false, then the value can be 0.

Is this possible using Table.AddRankColumn?

If not, is there a way to rank order records only when the value is true?

Thank you

[m_dekorte]

Hi @pbi_throw_away 

Give something like this a go, where you group by customer and columnA to conditionally add a rank

Copy this example into a new blank query

let
    Source = Table.FromRows(Json.Document(Binary.Decompress(Binary.FromText("ZZE7EsIwDETv4jpF9LOkkgIqKj5VJve/BtgGJmYLN2/W8ltr28rj9jyXpdT3kdBa9uXHqDFTPzJubGU5MhksgTFNOW3M1/HG5XS9N+gNivIx2GVIpoHRBzJBTilxYFWCy+krGApVaPd3tzNxbKys0E6NJplhnQEDgxQExQ0Y0fxd1l+pk81oTGhtgblkhh1rJDBXzEm1SWY04YrfEIaLjymXvV36NLAH42P9hX3LaxhC07f3/gI=", BinaryEncoding.Base64), Compression.Deflate)), let _t = ((type nullable text) meta [Serialized.Text = true]) in type table [ColumnA = _t, #"Customer ID" = _t, Order = _t]),
    GroupRows = Table.Group(Source, {"ColumnA", "Customer ID"}, {{"t", each if List.First([ColumnA]) = "TRUE" then Table.AddRankColumn( _, "Rank", {"Order", Order.Descending}) else Table.AddColumn( _, "Rank", each 0 ), type table [ColumnA=nullable text, Customer ID=nullable text, Order=nullable text, Rank=number]}}),
    AddCustOrderRank = Table.ExpandTableColumn(GroupRows, "t", {"Order", "Rank"}, {"Order", "Customer Order Rank"})
in
    AddCustOrderRank

Ps. Please mark this answer as solution when it helped you to resolve your question, thanks!