CREATE TABLE Treatments (professional_id VARCHAR(255), treatment_type_code VARCHAR(255)); CREATE TABLE Treatment_types (treatment_type_description VARCHAR(255), treatment_type_code VARCHAR(255)); CREATE TABLE professionals (first_name VARCHAR(255), professional_id VARCHAR(255))
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