Forum Discussion

Anonymous's avatar
Anonymous
Not applicable
7 years ago
Solved

Index column only for specific value (Conditional index column)

Hello,   I am looking for some help with the index column. I have a long column (Column1) with text and want add an index column. The challenge is that the index should only be counted (+1) if in C...
Need Help
Nolock's avatar
Nolock
Icon for Resident Rockstar rankResident Rockstar
7 years ago

Hi Anonymous,

I have a solution for you. Click through the steps and you will see how it works.

I create an index on the original table. Then I create a second table "KeywordRowFullIndex" which contains only "Keyword" rows and create a secondary index on this smaller table. And in the end I join them together on the FullIndex.

 

let
    Source = Table.FromRows(Json.Document(Binary.Decompress(Binary.FromText("i45W8k6tLM8vSlGK1YlWCkmtKFEwVACBGgWEiBFEBCyAodwYSRIsYIIuYIpPuxlMMhYA", BinaryEncoding.Base64), Compression.Deflate)), let _t = ((type text) meta [Serialized.Text = true]) in type table [Column1 = _t]),
    IndexColumn = Table.AddIndexColumn(Source, "FullIndex", 0, 1),
    KeywordRowFullIndex = Table.SelectRows(IndexColumn, each [Column1] = "Keyword"),
    SecondaryIndex = Table.AddIndexColumn(KeywordRowFullIndex, "Index", 1, 1),
    Join = Table.NestedJoin(IndexColumn, "FullIndex", SecondaryIndex, "FullIndex", "SecondaryIndex"),
    ExpandedSecondaryIndex = Table.ExpandTableColumn(Join, "SecondaryIndex", {"Index"}, {"Index"}),
    RemoveFullIndexColumn = Table.RemoveColumns(ExpandedSecondaryIndex,{"FullIndex"})
in
    RemoveFullIndexColumn
  • Anonymous's avatar
    Anonymous
    Not applicable
    7 years ago

    Hi Nolock,

     

    Thank you very much for your code, which also provides the index in those rows with the keyword. But unfortunately a lot of rows are deleted in the end, almost every second. Do you have any idea why that is?

    • Nolock's avatar
      Nolock
      Icon for Resident Rockstar rankResident Rockstar
      7 years ago

      Hi Anonymous,

      no spontanious idea. Please, can you provide some sample data where it doesn't work?

    • v-juanli-msft's avatar
      v-juanli-msft
      Icon for Community Support rankCommunity Support
      7 years ago

      Hi Anonymous 

      As tested, Nolock 's solution should work.

      You don't need to filter data, just check my pbix.

       

      Best Regards
      Maggie

       

      Community Support Team _ Maggie Li
      If this post helps, then please consider Accept it as the solution to help the other members find it more quickly.