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

For each origin, how many flights came from there. Show bar chart.
SELECT origin, COUNT(*) FROM flight GROUP BY origin
SELECT "origin", COUNT(*) FROM "flight" GROUP BY "origin"