What is the name of the part that requires the most amount of skills to fix?
select t1.part_name from parts as t1 join part_faults as t2 on t1.part_id = t2.part_id join skills_required_to_fix as t3 on t2.part_fault_id = t3.part_fault_id group by t1.part_id order by count ( * ) desc limit 1
How many skills does it need?
select count ( * ) from parts as t1 join part_faults as t2 on t1.part_id = t2.part_id join skills_required_to_fix as t3 on t2.part_fault_id = t3.part_fault_id group by t1.part_id order by count ( * ) desc limit 1