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In PowerQuery I want to add a custom column that provides total number of values exists for a correpsonding ID and create a custom column based on the value
For example, new custom column(Total Child) should be created based on total number of value exists in (Child1 + Child2 + Child3 ) for a corresponding ID(Parent) and if it is greater than 1 it should display as Yes or No in the column Child More than 1 .
Below screen shot is what I'm trying to create
Solved! Go to Solution.
You can unpivot the child columns and then do a group by on the parent column with a count aggregation on the unpivoted child column and then merge that result back with the original table.
Unpivot:
Group:
Full sample query you can paste into the Advanced Editor:
let
Source = Table.FromRows(Json.Document(Binary.Decompress(Binary.FromText("i45WMjQwMFDSUTI0AhEmQEIpVgchagwSANKmMFFDEM8MRJgjqQVrtoCohYnBtFpiigGRkQFMzAQqYIikzhShzkgpNhYA", BinaryEncoding.Base64), Compression.Deflate)), let _t = ((type nullable text) meta [Serialized.Text = true]) in type table [Parent = _t, Child1 = _t, Child2 = _t, Child3 = _t]),
#"Changed Type" = Table.TransformColumnTypes(Source,{{"Parent", Int64.Type}, {"Child1", Int64.Type}, {"Child2", Int64.Type}, {"Child3", Int64.Type}}),
#"Unpivoted Columns" = Table.UnpivotOtherColumns(#"Changed Type", {"Parent"}, "Child", "Value"),
#"Grouped Rows" = Table.Group(#"Unpivoted Columns", {"Parent"}, {{"Total Child", each Table.RowCount(_), Int64.Type}}),
#"Merged Queries" = Table.NestedJoin(#"Changed Type", {"Parent"}, #"Grouped Rows", {"Parent"}, "Grouped Rows", JoinKind.LeftOuter),
#"Expanded Grouped Rows" = Table.ExpandTableColumn(#"Merged Queries", "Grouped Rows", {"Total Child"}, {"Total Child"})
in
#"Expanded Grouped Rows"
Thanks, this worked as expected . Just want to check is there any approach apart from group/summarize and then merging back into the original table ., like can it be done directly using original table
There are certainly other possible methods. You could add a custom column like this instead:
(row) =>
List.NonNullCount(
List.Combine(
Table.ToColumns(
Table.RemoveColumns(
Table.SelectRows(
#"Changed Type",
each [Parent] = row[Parent]
),
"Parent"
)
)
)
)
However, this will be much less efficient for larger sets of data since it has to filter the entire table for each row. The method I suggested earlier should scale better.
Thank you , then will prefer Approach1 which was suggested earlier as we are dealing with larger data sets.
You can unpivot the child columns and then do a group by on the parent column with a count aggregation on the unpivoted child column and then merge that result back with the original table.
Unpivot:
Group:
Full sample query you can paste into the Advanced Editor:
let
Source = Table.FromRows(Json.Document(Binary.Decompress(Binary.FromText("i45WMjQwMFDSUTI0AhEmQEIpVgchagwSANKmMFFDEM8MRJgjqQVrtoCohYnBtFpiigGRkQFMzAQqYIikzhShzkgpNhYA", BinaryEncoding.Base64), Compression.Deflate)), let _t = ((type nullable text) meta [Serialized.Text = true]) in type table [Parent = _t, Child1 = _t, Child2 = _t, Child3 = _t]),
#"Changed Type" = Table.TransformColumnTypes(Source,{{"Parent", Int64.Type}, {"Child1", Int64.Type}, {"Child2", Int64.Type}, {"Child3", Int64.Type}}),
#"Unpivoted Columns" = Table.UnpivotOtherColumns(#"Changed Type", {"Parent"}, "Child", "Value"),
#"Grouped Rows" = Table.Group(#"Unpivoted Columns", {"Parent"}, {{"Total Child", each Table.RowCount(_), Int64.Type}}),
#"Merged Queries" = Table.NestedJoin(#"Changed Type", {"Parent"}, #"Grouped Rows", {"Parent"}, "Grouped Rows", JoinKind.LeftOuter),
#"Expanded Grouped Rows" = Table.ExpandTableColumn(#"Merged Queries", "Grouped Rows", {"Total Child"}, {"Total Child"})
in
#"Expanded Grouped Rows"
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