-- UPDATE asociado a la tarea
USE vn;
UPDATE vn.worker w
		JOIN(SELECT r.workerFk
				FROM route r
					LEFT JOIN workerLabour wl ON wl.workerFk = r.workerFk
				WHERE wl.workerFk IS NULL
					AND r.workerFk IS NOT NULL
				GROUP BY r.workerFk) sub ON sub.workerFk = w.id
	SET w.isFreelance = TRUE; 