CREATE TABLE manager (manager_id DECIMAL, name TEXT, country TEXT, working_year_starts TEXT, age DECIMAL, level DECIMAL)
CREATE TABLE train (train_id DECIMAL, train_num TEXT, name TEXT, from TEXT, arrival TEXT, railway_id DECIMAL)
CREATE TABLE railway_manage (railway_id DECIMAL, manager_id DECIMAL, from_year TEXT)
CREATE TABLE railway (railway_id DECIMAL, railway TEXT, builder TEXT, built TEXT, wheels TEXT, location TEXT, objectnumber TEXT)

List the builders of railways in ascending alphabetical order.
SELECT builder FROM railway ORDER BY builder
SELECT "builder" FROM "railway" ORDER BY "builder" NULLS FIRST