CREATE TABLE technician (Name VARCHAR, technician_id VARCHAR)
CREATE TABLE repair_assignment (Name VARCHAR, technician_id VARCHAR)

List the names of technicians who have not been assigned to repair machines.
SELECT Name FROM technician WHERE NOT technician_id IN (SELECT technician_id FROM repair_assignment)
SELECT "Name" FROM "technician" WHERE NOT "technician_id" IN (SELECT "technician_id" FROM "repair_assignment")