List all engineers' first and last names.
select t1.first_name, t1.last_name from maintenance_engineers as t1 join engineer_skills as t2 on t1.engineer_id = t2.engineer_id
List the details of each engineer and corresponding skill descriptions as well, along with the names.
select t1.first_name, t1.last_name, t1.other_details, t3.skill_description from maintenance_engineers as t1 join engineer_skills as t2 on t1.engineer_id = t2.engineer_id join skills as t3 on t2.skill_id = t3.skill_id