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teylyn's avatar
teylyn
Advocate III
5 years ago
Solved

M Code to replace underscores in column names

Hi all,   my SQL Server DBA tells me that SQL doesn't like spaces in column names, and all tables and views in that project have unsightly underscores. In Power BI, I want to replace them with blan...
Tips and Tricks
  • wdx223_Daniel's avatar
    wdx223_Daniel
    5 years ago

    Table.RenameColumns(Navigation,List.Transform(Table.ColumnNames(Navigation),each {_,Text.Replace(_,"_"," ")}))

  • ImkeF's avatar
    ImkeF
    5 years ago

    Hi teylyn  and wdx223_Daniel ,
    I've been there as well before I've discovered that the M-language has some nice functions that are not exposed through the UI. Transforming column names with a custom function is one of them: 

    Table.TransformColumnNames(Source, each Text.Replace(_, "_", " ") )

     

wdx223_Daniel's avatar
wdx223_Daniel
Community Champion
5 years ago

Table.RenameColumns(Navigation,List.Transform(Table.ColumnNames(Navigation),each {_,Text.Replace(_,"_"," ")}))

DAXTERONPOWERBI's avatar
DAXTERONPOWERBI
New Member
4 years ago

Hi, this solution does not work instead it gives follwing error 

Expression.SyntaxError: Token Eof expected.

  • Rustickoff's avatar
    Rustickoff
    New Member
    3 years ago

    Please kindly change Navigation with the name of previous step/table name and replace with Text.Replace(_," ","_") if you want to replace space with _

  • Rustickoff's avatar
    Rustickoff
    New Member
    3 years ago

    I use the following to make it fit for sql:
    TextLower = Table.TransformColumnNames(PreviousStepTableName, Text.Lower),

    LowerDash = Table.RenameColumns( TextLower, List.Transform(Table.ColumnNames(TextLower), each {_, Text.Replace(_," ","_")}), MissingField.Ignore)