show names of technicians by order of quality rank of machine they are assigned from worst to best
SELECT T3.Name FROM repair_assignment AS T1 JOIN machine AS T2 ON T1.machine_id   =   T2.machine_id JOIN technician AS T3 ON T1.technician_ID   =   T3.technician_ID ORDER BY T2.quality_rank
technicians' names refers to technician.Name; order of quality rank of machine from worst to best refers to ORDER BY machine.quality_rank ASC (default sorting order is ascending);