List the first name of all the professionals along with the description of the treatment they have done.
create table treatments (professional_id varchar, treatment_type_code varchar, PRIMARY KEY (professional_id)); create table treatment_types (treatment_type_description varchar, treatment_type_code varchar, PRIMARY KEY (treatment_type_description)); create table professionals (first_name varchar, professional_id varchar, PRIMARY KEY (first_name))
select distinct t1.first_name, t3.treatment_type_description from professionals as t1 join treatments as t2 on t1.professional_id = t2.professional_id join treatment_types as t3 on t2.treatment_type_code = t3.treatment_type_code