CREATE TABLE aircraft (aid DECIMAL, name VARCHAR, distance DECIMAL)
CREATE TABLE certificate (eid DECIMAL, aid DECIMAL)
CREATE TABLE flight (flno DECIMAL, origin VARCHAR, destination VARCHAR, distance DECIMAL, departure_date DATE, arrival_date DATE, price DECIMAL, aid DECIMAL)
CREATE TABLE employee (eid DECIMAL, name VARCHAR, salary DECIMAL)

Show all origins and the number of flights from each origin by a bar chart, list by the X from high to low.
SELECT origin, COUNT(*) FROM flight GROUP BY origin ORDER BY origin DESC
SELECT "origin", COUNT(*) FROM "flight" GROUP BY "origin" ORDER BY "origin" DESC NULLS LAST