Forum Discussion

DanFromMontreal's avatar
DanFromMontreal
Helper IV
4 years ago

Change ColumnType via table

Hello Dear Community, I'm having trouble with the type automatically assigned by the Power Query Editor (PQE) so I want to force a type depending of the HeaderName. When it sees the HeaderName in t...
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Anonymous's avatar
Anonymous
Not applicable
4 years ago

I would first have power query take the best guess, by setting Automatically detect column types. After that, you do

 

Table.TransformColumnTypes(PriorStepOrTableName, List.Zip({tblType[HeaderName], tblType[Type]})

 

You may need to throw some quotes around the HeaderNames, I'm not sure because I'm not at my desk, but the point is to create the list of lists accepted by the function, like {{"HeaderName", type text}, {"AnotherHeader", type number}}

--Nate

  • DanFromMontreal's avatar
    DanFromMontreal
    Helper IV
    4 years ago

    Anonymous , it does not work.  Tried with some quotes with the same result.

    It is providing me an error.

    Any ideas how to modify the code to make it work?

    I know that I'm using the code to replace the ColumnHeader and it is working fine.  It seems very similar...

    #"Replace Cols Names" = Table.TransformColumnNames(#"Promote Header", each Text.Combine(List.ReplaceMatchingItems({_},List.Buffer(List.Zip({tblBeforeAfter[Before],tblBeforeAfter[After]})), Comparer.OrdinalIgnoreCase))),