CREATE TABLE train (id INT, train_number INT, name TEXT, origin TEXT, destination TEXT, time TEXT, interval TEXT)
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)
CREATE TABLE route (train_id INT, station_id INT)

Return a histogram on what is the average high temperature for each day of week?, display in asc by the total number.
SELECT day_of_week, AVG(high_temperature) FROM weekly_weather GROUP BY day_of_week ORDER BY AVG(high_temperature)
SELECT "day_of_week", AVG("high_temperature") FROM "weekly_weather" GROUP BY "day_of_week" ORDER BY AVG("high_temperature") NULLS FIRST