CREATE TABLE train (id INT, train_number INT, name TEXT, origin TEXT, destination TEXT, time TEXT, interval TEXT)
CREATE TABLE route (train_id INT, station_id INT)
CREATE TABLE station (id INT, network_name TEXT, services TEXT, local_authority TEXT)
CREATE TABLE weekly_weather (station_id INT, day_of_week TEXT, high_temperature INT, low_temperature INT, precipitation FLOAT, wind_speed_mph INT)

Show me the total number by origin in a histogram, and I want to list by the Y-axis in descending.
SELECT origin, COUNT(*) FROM train GROUP BY origin ORDER BY COUNT(*) DESC
SELECT "origin", COUNT(*) FROM "train" GROUP BY "origin" ORDER BY COUNT(*) DESC NULLS LAST