CREATE TABLE routes (rid NUMBER, dst_apid NUMBER, dst_ap CLOB, src_apid NUMBER, src_ap CLOB, alid NUMBER, airline CLOB, codeshare CLOB)
CREATE TABLE airports (apid NUMBER, name CLOB, city CLOB, country CLOB, x NUMBER, y NUMBER, elevation NUMBER, iata CLOB, icao CLOB)
CREATE TABLE airlines (alid NUMBER, name CLOB, iata CLOB, icao CLOB, callsign CLOB, country CLOB, active CLOB)

List all countries and their number of airlines in the descending order of number of airlines.
SELECT country, COUNT(*) FROM airlines GROUP BY country ORDER BY COUNT(*) DESC
SELECT "country", COUNT(*) FROM "airlines" GROUP BY "country" ORDER BY COUNT(*) DESC