Table.RenameColumns Function in Power Query

The Table.RenameColumns function in Power Query returns a table with the columns renamed as specified.

Syntax

Table.RenameColumns(
    table as table, 
    renames as list, 
    optional missingField as nullable number
) as table

The renames list has the syntax:
{
{OldColumnName1, NewColumnName1},
{OldColumnName2, NewColumnName2}
}

Example: Rename the column “Phone" to "Contact" and column "Company" to "Organization”.

Power Query M

let
  MyTable = Table.FromRecords(
    {
      [CustomerID = 1, Name = "Ashish", Phone = "123-4567", Company = "TCS"], 
      [CustomerID = 2, Name = "Katrina", Phone = "987-6543", Company = "TCS"], 
      [CustomerID = 3, Name = "Alia", Phone = "543-7890", Company = "TCS"], 
      [CustomerID = 4, Name = "Vicky", Phone = "676-8479", Company = "TCS"], 
      [CustomerID = 5, Name = "Mohini", Phone = "574-8864", Company = "TCS"], 
      [CustomerID = 6, Name = "Meenakshi", Phone = "574-8864", Company = "TCS"], 
      [CustomerID = 7, Name = "Esha", Phone = "574-8864", Company = "TCS"], 
      [CustomerID = 8, Name = "Anjali", Phone = "574-8864", Company = "TCS"]
    }
  ), 
  Return = Table.RenameColumns(MyTable, {{"Phone", "Contact"}, {"Company", "Organization"}})
in
  Return

The output of the above formula is shown below:

Table.RenameColumns function in Power Query

Case: Column Not exists The column name which we are going to rename if does not exist in the table, it will throw an error.

Power Query M

let
  MyTable = Table.FromRecords(
    {
      [CustomerID = 1, Name = "Ashish", Phone = "123-4567", Company = "TCS"], 
      [CustomerID = 2, Name = "Katrina", Phone = "987-6543", Company = "TCS"], 
      [CustomerID = 3, Name = "Alia", Phone = "543-7890", Company = "TCS"], 
      [CustomerID = 4, Name = "Vicky", Phone = "676-8479", Company = "TCS"], 
      [CustomerID = 5, Name = "Mohini", Phone = "574-8864", Company = "TCS"], 
      [CustomerID = 6, Name = "Meenakshi", Phone = "574-8864", Company = "TCS"], 
      [CustomerID = 7, Name = "Esha", Phone = "574-8864", Company = "TCS"], 
      [CustomerID = 8, Name = "Anjali", Phone = "574-8864", Company = "TCS"]
    }
  ), 
  Return = Table.RenameColumns(MyTable, {{"Mobile", "Contact"}, {"Company", "Organization"}})
in
  Return

The output of the above formula is shown below:

To catch this error, we can use the third argument of the function, i.e. MissingField.

Example: Replace the column name "Mobile" with "Contact" in the table and ignore if the column doesn't exist.

Power Query M

let
  MyTable = Table.FromRecords(
    {
      [CustomerID = 1, Name = "Ashish", Phone = "123-4567", Company = "TCS"], 
      [CustomerID = 2, Name = "Katrina", Phone = "987-6543", Company = "TCS"], 
      [CustomerID = 3, Name = "Alia", Phone = "543-7890", Company = "TCS"], 
      [CustomerID = 4, Name = "Vicky", Phone = "676-8479", Company = "TCS"], 
      [CustomerID = 5, Name = "Mohini", Phone = "574-8864", Company = "TCS"], 
      [CustomerID = 6, Name = "Meenakshi", Phone = "574-8864", Company = "TCS"], 
      [CustomerID = 7, Name = "Esha", Phone = "574-8864", Company = "TCS"], 
      [CustomerID = 8, Name = "Anjali", Phone = "574-8864", Company = "TCS"]
    }
  ), 
  Return = Table.RenameColumns(MyTable, {{"Mobile", "Contact"}, {"Company", "Organization"}}, MissingField.Ignore)
in
  Return

The output of the above formula is shown below:

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