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)

How many flights for each origin city? Return a bar chart.
SELECT origin, COUNT(origin) FROM flight GROUP BY origin ORDER BY origin
SELECT "origin", COUNT("origin") FROM "flight" GROUP BY "origin" ORDER BY "origin" NULLS FIRST