How to format a numeric column as phone number in SQL

Question

I have table in the database with a phone number column. The numbers look like this:

123456789

I want to format that to look like this:

Answer 1

You can also try this:

CREATE  function [dbo].[fn_FormatPhone](@Phone varchar(30)) 
returns varchar(30)
As
Begin
declare @FormattedPhone varchar(30)

set     @Phone = replace(@Phone, '.', '-') --alot of entries use periods instead of dashes
set @FormattedPhone =
    Case
      When isNumeric(@Phone) = 1 Then
        case
          when len(@Phone) = 10 then '('+substring(@Phone, 1, 3)+')'+ ' ' +substring(@Phone, 4, 3)+ '-' +substring(@Phone, 7, 4)
          when len(@Phone) = 7  then substring(@Phone, 1, 3)+ '-' +substring(@Phone, 4, 4)
          else @Phone
        end
      When @phone like '[0-9][0-9][0-9]-[0-9][0-9][0-9][0-9][0-9][0-9][0-9]' Then '('+substring(@Phone, 1, 3)+')'+ ' ' +substring(@Phone, 5, 3)+ '-' +substring(@Phone, 8, 4)
      When @phone like '[0-9][0-9][0-9] [0-9][0-9][0-9] [0-9][0-9][0-9][0-9]' Then '('+substring(@Phone, 1, 3)+')'+ ' ' +substring(@Phone, 5, 3)+ '-' +substring(@Phone, 9, 4)
      When @phone like '[0-9][0-9][0-9]-[0-9][0-9][0-9]-[0-9][0-9][0-9][0-9]' Then '('+substring(@Phone, 1, 3)+')'+ ' ' +substring(@Phone, 5, 3)+ '-' +substring(@Phone, 9, 4)
      Else @Phone
    End
return  @FormattedPhone

end

use on it select

(SELECT [dbo].[fn_FormatPhone](f.coffphone)) as 'Phone'

Output will be