>How can I insert hyphens from right to left,
>one after the fourth digit and other after the eighth digit,
>so that the number: 1133412927 becomes 11-3341-2927
>
>Sometimes it can be: 01133412927, and must become: 011-3341-2927
>
>Thanks
>
>Moises

I think you should look into STUFF() function.