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Typical errors at solution of exercises (database "Aeroflot")

AuthorS. Moiseenko

Exercise 33

Find the dates where number of trips from town Rostov were the maximum. Result set: number of trips, date.

AuthorS. Moiseenko

Exercise 40

Find the names of all companies, each possessing a superset of all plane types that some other company also possesses.

AuthorS. Moiseenko

Exercise 49

Among the passengers, who flew by the planes of more then one company, find those who made the same number of trips by the planes of each of these companies. Result set: passenger name.

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