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