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August 21, 2019
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Hi PQ Guru
for the attached example, basically new id and date will be added overtimes, notice that newly added record (that is new to the transpose table, for e.g Column 5) will not be automatically appeared in the transformed table (require to manually go to expanded custom to check it)
Previously I had also figured out mass rename of Column1, Column2, Column3 to Date1, Date2, Date3.....
= Table.TransformColumnNames(#"Expanded Custom", each Text.Replace(_ ,"Column","Date"))
Is there a direct M code to do the same for Changing all the column types to Date
and also how to avoid manually checking all the newly added column in the expanded custom to update the transposed table
Thank you Sir /Madam
See Answer
October 5, 2010
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Hi Chris,
the output table in the workbook isn't in a tabular format so it's not in a layout that can easily be used with pivot tables etc.
The input table is actually the layout you want,no need to transform it.
What exactly are you trying to do? What analysis/report are you trying to prepare from the source table?
Regards
Phil
August 21, 2019
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Hi Philip,
my user wanted to view in a pivot table format for dates, that is header with Date1, Date2..............
How about mass changing of all the columns to type date, can this be done using one M code, and also the automatic check of Column that are beyond, for this example row 9 for May, which is the fifth column, we need to got to the expanded custom to check it, is there a M code that can automate it
so no matter how users append to the tabular source table, he only need to refresh all to update the power query cross table
Thank you !
October 5, 2010
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Hi Chris,
It will be much easier, and new rows added to your source table will be automatically included in the final report, if you create a pivot table direct from the source and don't go through PQ. You'll just need to add some kind of index to each entry.
In the attached file I've added this ID column and created a PT on sheet MOTH.
Regards
Phil
August 21, 2019
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Hi Philip, thanks for your response, I know Pivot table can do the job but however to figure out why the expanded cannot be automated, sometimes we only want one solution, i.e. all in Power Query
Thank you !!
November 8, 2013
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Hi Chris,
You can use an iterative function to loop through all columns.
When you change a column format, this is what PQ generates: = Table.TransformColumnTypes(Source,{{"Date2", type date}})
What you need is to replace the static "Date2" with a variable inside the loop.
Source = Excel.CurrentWorkbook(){[Name="Table1"]}[Content],
ChangedType = List.Accumulate(Table.ColumnNames(Source),Source,(state,HeaderItem)=>if Text.Contains(HeaderItem,"Date") =true then Table.TransformColumnTypes(state,{{HeaderItem, type date}}) else state)
in
ChangedType
List.Accumulate will loop through all items from this list: Table.ColumnNames(Source) (which is the list of all column names in Source table)
The first argument of List.Accumulate can be a list only.
For example, You can create a loop from 1 to 10 (similar to VBA: For i=1 to 10) with List.Accumulate:
List.Accumulate({1..10}, .......
In our case, the loop through Table.ColumnNames(Source) translates to:
For Each HeaderItem in Table.ColumnNames(Source)
if Text.Contains(HeaderItem,"Date") =true then Table.TransformColumnTypes(state,{{HeaderItem, type date}}) else state
Next HeaderItem
Source is the initial seed, in this case the seed is a table.
At each iteration, the seed will change the state based on the function used: if the HeaderItem contains the text "Date", that column will be transformed to date format.
August 21, 2019
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Hi Catalin
however for my case, I require to find a solution to automatically insert "Column4", "Column5" whenever the source file append new data, instead of double click on Expanded Custom to physically check it
let
Source = Excel.CurrentWorkbook(){[Name="Table1"]}[Content],
#"Changed Type" = Table.TransformColumnTypes(Source,{{"DOA", type date}}),
#"Grouped Rows" = Table.Group(#"Changed Type", {"Sr."}, {{"Grouped", each _, type table [#"Sr."=number, DOA=nullable date]}}),
#"Added Custom" = Table.AddColumn(#"Grouped Rows", "Custom", each Table.Transpose(Table.SelectColumns([Grouped], "DOA"))),
#"Expanded Custom" = Table.ExpandTableColumn(#"Added Custom", "Custom", {"Column1", "Column2", "Column3"}, {"Column1", "Column2", "Column3"}),
#"Removed Columns" = Table.RemoveColumns(#"Expanded Custom",{"Grouped"}),
#"Renamed Columns" = Table.RenameColumns(#"Removed Columns",{{"Column1", "DOA Date1"}, {"Column2", "DOA Date2"}, {"Column3", "DOA Date3"}}),
#"Changed Type1" = Table.TransformColumnNames(#"Renamed Columns", each Text.Replace(_, "Column", "DOA Date")),
#"Changed Type2" = Table.TransformColumnTypes(#"Changed Type1",{{"DOA Date1", type date}, {"DOA Date2", type date}, {"DOA Date3", type date}})
in
#"Changed Type2"
Is it the same method that you recommended ?
Thank you !
November 8, 2013
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I thought it's obvious that what I provided is for formatting all columns.
You don't have to go manually and expand the new columns, that's what Table.ColumnNames does.
Instead of {"Column1", "Column2", "Column3"}, simply READ the existing column names dynamically from the previous step:
Table.ColumnNames(#"Added Custom")
August 21, 2019
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Sorry Catalin
After replacing it
= Table.ExpandTableColumn(#"Added Custom", "Custom", {Table.ColumnNames(#"Added Custom")}, {Table.ColumnNames(#"Added Custom")})
got error
Details:
Value=[List]
Type=[Type]
November 8, 2013
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Instead of {"Column1", "Column2", "Column3"}, simply READ the existing column names dynamically from the previous step:
Table.ColumnNames(#"Added Custom")
You was supposed to replace:
{"Column1", "Column2", "Column3"}
with
Table.ColumnNames(#"Added Custom")
NOT with:
{Table.ColumnNames(#"Added Custom")}
Remove the curly brackets, will work.
November 8, 2013
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Looked into your file, and you have multiple tables in the Custom column.
To get all headers (on some rows there may be different headers), you have to combine them first.
Use:
Table.ColumnNames(Table.Combine(#"Added Custom"[Custom]))
The result of Table.ColumnNames function is a list, that's why you don't need curly brackets.
This will provide a list of all headers from all tables in Custom column, even if the tables column names are different in each row.
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