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August 17, 2019
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Hi,
I have a question concerning the transformation of data into a table. I believe the solution is easy, but somehow I cannot get the clue. Having a sequence of headers in column1 with its value in column2. What I want to get is to transform Column1 into row headers and their records in rows below.
Input:
Column1 Column2
A 1
B 2
C 3
A 5
B 6
C 8
Desired output:
A B C
1 2 3
5 3 8
Thanks, Pavel
November 8, 2013
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Hi Pavel,
Try the attached file. The query looks like this:
let
Source = Excel.CurrentWorkbook(){[Name="Table1"]}[Content],
#"Renamed Columns" = Table.RenameColumns(Source,{{"Column1", "ID"},{"Column2","Value"}}),
#"Changed Type" = Table.TransformColumnTypes(#"Renamed Columns",{{"ID", type text}, {"Value", type text}}),
#"Grouped Rows" = Table.Group(#"Changed Type", {"ID"}, {{"Count", each _, type table [ Value=number]}}),
#"Extracted First Characters" = Table.TransformColumns(#"Grouped Rows", {{"Count", each Table.Transpose(Table.SelectColumns(_,{"Value"})) }}),
#"Expanded Count1" = Table.ExpandTableColumn(#"Extracted First Characters", "Count", Table.ColumnNames(Table.Combine(#"Extracted First Characters"[Count])), Table.ColumnNames(Table.Combine(#"Extracted First Characters"[Count]))),
#"Transposed Table1" = Table.Transpose(#"Expanded Count1"),
#"Promoted Headers1" = Table.PromoteHeaders(#"Transposed Table1", [PromoteAllScalars=true])
in
#"Promoted Headers1"
August 17, 2019
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Hi Catalin,
thanks for the hint 🙂
Pavel
Power BI
February 20, 2019
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Catalin,
I don't understand this step: #"Extracted First Characters"
Can you elaborate a bit?
November 8, 2013
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If you move up one step, you will see that the grouping step created tables in the second column. You will notice that those tables from the second column has both columns from the original table, and we need just the second column. That's what that step does:
Table.SelectColumns(_,{"Value"})
I transposed the result so we can have the values in a horizontal table that can be expanded to the right, otherwise it will expand in rows, not in columns.
I confess I was lazy, you got me... I used one of the buttons from interface to extract first char, that's how the step #"Extracted First Characters" was originally created ( had something like each Text.First(_,1) , but i replaced it with each Table.Transpose(Table.SelectColumns(_,{"Value"})) )
Power BI
February 20, 2019
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Catalin,
Really appreciated your patience. But I still stuck with this step: Extracted First Characters". I don't see adding a custom column with a formula nor do I see you use a custom button such as "Extract" because "Extract" was grayed out when I select "Table" column. I can't tell how you did it with this step from Power Query Editor.
Thanks!
November 8, 2013
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Use the Extract first character function on the first column, not the tables column...
Then change the column name and the function used in that step in the formula bar.
Power BI
February 20, 2019
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Catalin,
Know why you used the button to extract the first character and then change the formula. Is the following an M language?
#"Extracted First Characters" = Table.TransformColumns(#"Grouped Rows", {{"Count", each Table.Transpose(Table.SelectColumns(_,{"Value"})) }}),
Thanks!
November 8, 2013
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Hi Jim,
Everything in Power Query is in M language, not sure what your question is about. The only difference is that some of the operations are exposed to the user interface (you just have to use the buttons) , for everything else not included in interface you have to design your own way to process data (write custom M code to perform custom operations).
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