Custom Column - Count Columns With Data in That Row

[JayMo]

I am new to Power BI...so if this is the wrong place to ask, please let me know.

Using the Power Query Editor, I would like to create a custom column that will summarize the count of other columns in that row containing data (not blank). This is based over 20 inividual columns that have the same name prefixed by a single number (example - column1,column2,column3, etc..)

can someone assist me in what that formula should look like?
Thx

[Nolock · Accepted solution]

Hi @JayMo,

I've written the asked functionality with some test data. Let me know if it fills all your expectations. The code is well commented and split in many steps for better understanding.

let
    Source = Table.FromRows(Json.Document(Binary.Decompress(Binary.FromText("i45WMlTSUTICYiAyAeLEpGQIx83RJ9hVKVYnGiaLgmJjAQ==", BinaryEncoding.Base64), Compression.Deflate)), let _t = ((type text) meta [Serialized.Text = true]) in type table [Column1 = _t, Column2 = _t, XYZ = _t, ABC = _t, Column5 = _t, Column6 = _t, Column7 = _t]),
    CountOfNonNullColumns = Table.AddColumn(
        Source, 
        "Count of non null columns", 
        (rec) =>
            let
                // select field names having prefix "Column"
                selectedFieldNames = List.Select(Record.FieldNames(rec), each Text.StartsWith(_, "Column")),
                // create a new record with only these fields
                newRecord = Record.SelectFields(rec, selectedFieldNames),
                // select all valus of this record
                allValuesAsList = Record.ToList(newRecord),
                // transform to a new list where if value is null or empty then 0 else 1
                isNotNullList = List.Transform(allValuesAsList, each if _ = null or _ = "" then 0 else 1),
                // sum it up
                countOfNonNullItems = List.Sum(isNotNullList)
            in
                countOfNonNullItems
    )
in
    CountOfNonNullColumns