Show names of technicians who are assigned to repair machines with value point more than 70.
create table machine (machine_id varchar, value_points integer, PRIMARY KEY (machine_id)); create table repair_assignment (machine_id varchar, technician_id varchar, PRIMARY KEY (machine_id)); create table technician (name varchar, technician_id varchar, PRIMARY KEY (name))
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 where t2.value_points > 70