1) You will only have RESULTs mailed. And the RESULT of a ALTER TABLE is 'x rows affected'!
You can have more SQL statements seperated by semicolon and just add a SELECT statement at the end.
2) The option to execute external files in Notifications was discussed in-houiser her as late as Friday. Actually we have the code for it in 'favorites' allready … so this we intend to do!