Schema: CREATE TABLE Treatments (professional_id VARCHAR, treatment_type_code VARCHAR); CREATE TABLE Treatment_types (treatment_type_description VARCHAR, treatment_type_code VARCHAR); CREATE TABLE professionals (first_name VARCHAR, professional_id VARCHAR)
Question: List the first name of all the professionals along with the description of the treatment they have done.
SQL: 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