MySQL — Indexes & EXPLAIN

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