Which kind of part has the least number of faults? List the part name.
create table parts (part_name varchar, part_id varchar, PRIMARY KEY (part_name)); create table part_faults (part_id varchar, PRIMARY KEY (part_id))
select t1.part_name from parts as t1 join part_faults as t2 on t1.part_id = t2.part_id group by t1.part_name order by count(*) limit 1