Show all donor names.
SELECT DISTINCT donator_name FROM endowment
SELECT DISTINCT donator_name FROM endowment
[{'donator_name': 'Monte Plata'}, {'donator_name': 'San José de Ocoa'}, {'donator_name': 'Distrito Nacional'}, {'donator_name': 'Valverde'}, {'donator_name': 'San Cristóbal'}, {'donator_name': 'Santo Domingo Este'}, {'donator_name': 'Santiago'}, {'donator_name': 'Duarte'}, {'donator_name': 'Com. Dom. En Estados Unidos'}, {'donator_name': 'La Vega'}, {'donator_name': 'Peravia'}]