Database: dog_kennels
Question: Which professional did not operate any treatment on dogs? List the professional's id, role and email.
SQL:
SELECT professional_id ,  role_code ,  email_address FROM Professionals EXCEPT SELECT T1.professional_id ,  T1.role_code ,  T1.email_address FROM Professionals AS T1 JOIN Treatments AS T2 ON T1.professional_id  =  T2.professional_id