Forum Discussion

joshua1990's avatar
joshua1990
Post Prodigy
3 years ago
Solved

Change blank by earliest text value per week

Hi all!

I have an archive with the weekly extract of our sales data in a table like this:

Archival Year-Week Order Year-Week Value
2023-01 1 2023-01 5
2023-01 2 null 6

 

As you can see, it happens the is a "null" in the Year-Week column.

I would like to change the null to the earliest Year-Week, that is available within the same Archival Year-Week value.

 

How would you do that within PQ if the table has rows more than 50MM?

 

Need Help
  • Anonymous's avatar
    Anonymous
    3 years ago

    Hi joshua1990 ,

    Hope it helps.

    let
  Source = Table.FromRows(
    Json.Document(
      Binary.Decompress(
        Binary.FromText("i45WMjIwMtY1MFTSUQJhBM9UKVYHWdYIiPNKc3KAlJlSbCwA", BinaryEncoding.Base64), 
        Compression.Deflate
      )
    ), 
    let
      _t = ((type nullable text) meta [Serialized.Text = true])
    in
      type table [#"Archival Year-Week" = _t, Order = _t, #"Year-Week" = _t, Value = _t]
  ), 
  #"Changed Type" = Table.TransformColumnTypes(
    Source, 
    {
      {"Archival Year-Week", type date}, 
      {"Order", Int64.Type}, 
      {"Year-Week", type date}, 
      {"Value", Int64.Type}
    }
  ), 
  Custom1 = Table.TransformColumns(
    #"Changed Type", 
    {
      "Year-Week", 
      each 
        if _ <> null then
          _
        else
          Table.Group(
            #"Changed Type", 
            {"Archival Year-Week"}, 
            {{"Min", each List.Min([#"Archival Year-Week"])}}
          )[Min]{0}
    }
  )
in
  Custom1

     

    Best Regards,
    Gao
    Community Support Team

     

    If there is any post helps, then please consider Accept it as the solution  to help the other members find it more quickly. If I misunderstand your needs or you still have problems on it, please feel free to let us know. Thanks a lot!

    How to get your questions answered quickly --  How to provide sample data in the Power BI Forum

2 Replies

  • ronrsnfld's avatar
    ronrsnfld
    Super User
    3 years ago

    If your actual data is similar to what you show, simply select that column and Fill Down.

  • Anonymous's avatar
    Anonymous
    Not applicable
    3 years ago

    Hi joshua1990 ,

    Hope it helps.

    let
  Source = Table.FromRows(
    Json.Document(
      Binary.Decompress(
        Binary.FromText("i45WMjIwMtY1MFTSUQJhBM9UKVYHWdYIiPNKc3KAlJlSbCwA", BinaryEncoding.Base64), 
        Compression.Deflate
      )
    ), 
    let
      _t = ((type nullable text) meta [Serialized.Text = true])
    in
      type table [#"Archival Year-Week" = _t, Order = _t, #"Year-Week" = _t, Value = _t]
  ), 
  #"Changed Type" = Table.TransformColumnTypes(
    Source, 
    {
      {"Archival Year-Week", type date}, 
      {"Order", Int64.Type}, 
      {"Year-Week", type date}, 
      {"Value", Int64.Type}
    }
  ), 
  Custom1 = Table.TransformColumns(
    #"Changed Type", 
    {
      "Year-Week", 
      each 
        if _ <> null then
          _
        else
          Table.Group(
            #"Changed Type", 
            {"Archival Year-Week"}, 
            {{"Min", each List.Min([#"Archival Year-Week"])}}
          )[Min]{0}
    }
  )
in
  Custom1

     

    Best Regards,
    Gao
    Community Support Team

     

    If there is any post helps, then please consider Accept it as the solution  to help the other members find it more quickly. If I misunderstand your needs or you still have problems on it, please feel free to let us know. Thanks a lot!

    How to get your questions answered quickly --  How to provide sample data in the Power BI Forum