CREATE TABLE employee (eid NUMBER, name CLOB, salary NUMBER)
CREATE TABLE flight (flno NUMBER, origin CLOB, destination CLOB, distance NUMBER, departure_date TIME, arrival_date TIME, price NUMBER, aid NUMBER)
CREATE TABLE certificate (eid NUMBER, aid NUMBER)
CREATE TABLE aircraft (aid NUMBER, name CLOB, distance NUMBER)

What are the destinations and number of flights to each one?
SELECT destination, COUNT(*) FROM flight GROUP BY destination
SELECT "destination", COUNT(*) FROM "flight" GROUP BY "destination"