Custom column of non duplicates

[nathan_kul]

Say I have a column of ID values in Power BI with many duplicates for each ID value. If I wanted to make a custom column where each ID only appears once and duplicates will have Blank() value. How would I code that?

[Anonymous · Accepted solution]

Hi @nathan_kul ,

Please refer to the following steps. You can adjust the Source step to match your actual data source.

let
    Source = Table.FromRecords({[ID = 1], [ID = 2], [ID = 2], [ID = 3], [ID = 3], [ID = 3]}),
    #"Grouped Rows" = Table.Group(Source, {"ID"}, {{"Data", each Table.AddIndexColumn(_, "Index", 0, 1, Int64.Type)}}),
    #"Expanded Data" = Table.ExpandTableColumn(#"Grouped Rows", "Data", {"Index"}, {"Index"}),
    #"Added Custom" = Table.AddColumn(#"Expanded Data", "ID2", each if [Index]=0 then [ID] else null),
    #"Removed Columns" = Table.RemoveColumns(#"Added Custom",{"Index"})
in
    #"Removed Columns"

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!

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[dufoq3 · Accepted solution]

Hi @nathan_kul, different approach here:
I've used @Anonymous sample data.

Output

let
    Source = Table.FromRecords({[ID = 1], [ID = 2], [ID = 2], [ID = 3], [ID = 3], [ID = 3]}),
    GroupedRows = Table.Group(Source, {"ID"}, {{"All", each Table.FromColumns(Table.ToColumns(_) & {{[ID]{0}?}}, Value.Type(_ & #table(type table[Unique ID=Int64.Type],{}))), type table}}),
    Combined = Table.Combine(GroupedRows[All])
in
    Combined

[Omid_Motamedise · Accepted solution]

lovely question, use this formula to reach this result

let
    Source = Excel.CurrentWorkbook(){[Name="Table3"]}[Content],
    #"Added Index" = Table.AddIndexColumn(Source, "Index", 0, 1, Int64.Type),
    #"Added Custom" = Table.AddColumn(#"Added Index", "Custom", each if List.Contains(List.FirstN(Source[ID],[Index]),[ID]) then "" else [ID])
in
    #"Added Custom"

[dufoq3 · Accepted solution]

Hi @nathan_kul, different approach here:
I've used @Anonymous sample data.

Output

let
    Source = Table.FromRecords({[ID = 1], [ID = 2], [ID = 2], [ID = 3], [ID = 3], [ID = 3]}),
    GroupedRows = Table.Group(Source, {"ID"}, {{"All", each Table.FromColumns(Table.ToColumns(_) & {{[ID]{0}?}}, Value.Type(_ & #table(type table[Unique ID=Int64.Type],{}))), type table}}),
    Combined = Table.Combine(GroupedRows[All])
in
    Combined

[Anonymous · Accepted solution]

Hi @nathan_kul ,

Please refer to the following steps. You can adjust the Source step to match your actual data source.

let
    Source = Table.FromRecords({[ID = 1], [ID = 2], [ID = 2], [ID = 3], [ID = 3], [ID = 3]}),
    #"Grouped Rows" = Table.Group(Source, {"ID"}, {{"Data", each Table.AddIndexColumn(_, "Index", 0, 1, Int64.Type)}}),
    #"Expanded Data" = Table.ExpandTableColumn(#"Grouped Rows", "Data", {"Index"}, {"Index"}),
    #"Added Custom" = Table.AddColumn(#"Expanded Data", "ID2", each if [Index]=0 then [ID] else null),
    #"Removed Columns" = Table.RemoveColumns(#"Added Custom",{"Index"})
in
    #"Removed Columns"

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