Question: Which professional did not operate any treatment on dogs? List the professional's id, role and email.
Schema: create table professionals (professional_id varchar, role_code varchar, email_address varchar, PRIMARY KEY (professional_id)); create table treatments (professional_id varchar, PRIMARY KEY (professional_id))
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