MySQL — Aggregates & GROUP BY

1 MySQL SELECT with LIMIT Easy 2 MySQL AVG salary by dept #1 Hard 3 MySQL AVG salary by dept #2 Medium 4 MySQL AVG salary by dept #3 Medium 5 MySQL AVG salary by dept #4 Hard 6 MySQL AVG salary by dept #5 Medium 7 MySQL AVG salary by dept #6 Medium 8 MySQL AVG salary by dept #7 Hard 9 MySQL AVG salary by dept #8 Medium 10 MySQL AVG salary by dept #9 Medium 11 MySQL AVG salary by dept #10 Hard 12 MySQL AVG salary by dept #11 Medium 13 MySQL AVG salary by dept #12 Medium 14 MySQL AVG salary by dept #13 Hard 15 MySQL AVG salary by dept #14 Medium 16 MySQL AVG salary by dept #15 Medium 17 MySQL AVG salary by dept #16 Hard 18 MySQL AVG salary by dept #17 Medium 19 MySQL AVG salary by dept #18 Medium 20 MySQL AVG salary by dept #19 Hard 21 MySQL AVG salary by dept #20 Medium 22 MySQL AVG salary by dept #21 Medium 23 MySQL AVG salary by dept #22 Hard 24 MySQL AVG salary by dept #23 Medium 25 MySQL AVG salary by dept #24 Medium 26 MySQL AVG salary by dept #25 Hard 27 MySQL AVG salary by dept #26 Medium 28 MySQL AVG salary by dept #27 Medium 29 MySQL AVG salary by dept #28 Hard 30 MySQL AVG salary by dept #29 Medium 31 MySQL AVG salary by dept #30 Medium