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Seyacout
New Member

columns delete in power query

I need power query to find all the columns that have a subtotal of zero and delete them all. 
how can I address the same.

1 ACCEPTED SOLUTION
Vijay_A_Verma
Super User
Super User

See the working here - Open a blank query - Home - Advanced Editor - Remove everything from there and paste the below code to test (later on when you use the query on your dataset, you will have to change the source appropriately. If you have columns other than these, then delete Changed type step and do a Changed type for complete table from UI again)

let
    Source = Table.FromRows(Json.Document(Binary.Decompress(Binary.FromText("VVFJEsMgDPsL53iGJcXh2L19A5P/f6MRWJ7mgAEj2ZLpPVzDEqqt7ViSEC7jFC2PvSHTwr70cLOUZIRiIFmPMCjSDFAnCJy7F1R7wC4bQzFKmRJAeXg9SEqkNOojJc/moDx5VTfB4vQX+RwH48WeSkNgJddFK6sz3gSydzaY/mmqoxDgH9N+Hkrx8Sk1zZmA8jVUOjtJnAe/ZEwczvcf", BinaryEncoding.Base64), Compression.Deflate)), let _t = ((type nullable text) meta [Serialized.Text = true]) in type table [Name = _t, Column1 = _t, Column2 = _t, Column3 = _t, Column4 = _t, Column5 = _t, Column6 = _t, Column7 = _t, Column8 = _t, Column9 = _t, Column10 = _t]),
    #"Changed Type" = Table.TransformColumnTypes(Source,{{"Name", type text}, {"Column1", Int64.Type}, {"Column2", Int64.Type}, {"Column3", Int64.Type}, {"Column4", Int64.Type}, {"Column5", Int64.Type}, {"Column6", Int64.Type}, {"Column7", Int64.Type}, {"Column8", Int64.Type}, {"Column9", Int64.Type}, {"Column10", Int64.Type}}),
    List1 = List.Transform(Table.ToColumns(#"Changed Type"),(x)=>try List.Sum(x) otherwise null),
    List2 = Table.ColumnNames(#"Changed Type"),
    ColumnsToBeRemoved = List.RemoveNulls(List.Transform(List.Positions(List1), (i)=>if List1{i}=0 then List2{i} else null)),
    Result = Table.RemoveColumns(#"Changed Type",ColumnsToBeRemoved)
in
    Result

View solution in original post

1 REPLY 1
Vijay_A_Verma
Super User
Super User

See the working here - Open a blank query - Home - Advanced Editor - Remove everything from there and paste the below code to test (later on when you use the query on your dataset, you will have to change the source appropriately. If you have columns other than these, then delete Changed type step and do a Changed type for complete table from UI again)

let
    Source = Table.FromRows(Json.Document(Binary.Decompress(Binary.FromText("VVFJEsMgDPsL53iGJcXh2L19A5P/f6MRWJ7mgAEj2ZLpPVzDEqqt7ViSEC7jFC2PvSHTwr70cLOUZIRiIFmPMCjSDFAnCJy7F1R7wC4bQzFKmRJAeXg9SEqkNOojJc/moDx5VTfB4vQX+RwH48WeSkNgJddFK6sz3gSydzaY/mmqoxDgH9N+Hkrx8Sk1zZmA8jVUOjtJnAe/ZEwczvcf", BinaryEncoding.Base64), Compression.Deflate)), let _t = ((type nullable text) meta [Serialized.Text = true]) in type table [Name = _t, Column1 = _t, Column2 = _t, Column3 = _t, Column4 = _t, Column5 = _t, Column6 = _t, Column7 = _t, Column8 = _t, Column9 = _t, Column10 = _t]),
    #"Changed Type" = Table.TransformColumnTypes(Source,{{"Name", type text}, {"Column1", Int64.Type}, {"Column2", Int64.Type}, {"Column3", Int64.Type}, {"Column4", Int64.Type}, {"Column5", Int64.Type}, {"Column6", Int64.Type}, {"Column7", Int64.Type}, {"Column8", Int64.Type}, {"Column9", Int64.Type}, {"Column10", Int64.Type}}),
    List1 = List.Transform(Table.ToColumns(#"Changed Type"),(x)=>try List.Sum(x) otherwise null),
    List2 = Table.ColumnNames(#"Changed Type"),
    ColumnsToBeRemoved = List.RemoveNulls(List.Transform(List.Positions(List1), (i)=>if List1{i}=0 then List2{i} else null)),
    Result = Table.RemoveColumns(#"Changed Type",ColumnsToBeRemoved)
in
    Result

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