CREATE TABLE flight (id INT, Vehicle_Flight_number TEXT, Date TEXT, Pilot TEXT, Velocity FLOAT, Altitude FLOAT, airport_id INT, company_id INT)
CREATE TABLE operate_company (id INT, name TEXT, Type TEXT, Principal_activities TEXT, Incorporated_in TEXT, Group_Equity_Shareholding FLOAT)
CREATE TABLE airport (id INT, City TEXT, Country TEXT, IATA TEXT, ICAO TEXT, name TEXT)

Show me the total number by country in a histogram, sort total number from high to low order please.
SELECT Country, COUNT(*) FROM airport GROUP BY Country ORDER BY COUNT(*) DESC
SELECT "Country", COUNT(*) FROM "airport" GROUP BY "Country" ORDER BY COUNT(*) DESC NULLS LAST