MySQL — String & date functions

1 MySQL IFNULL and CONCAT Easy 2 MySQL CONCAT and DATE_FORMAT #1 Hard 3 MySQL CONCAT and DATE_FORMAT #2 Medium 4 MySQL CONCAT and DATE_FORMAT #3 Medium 5 MySQL CONCAT and DATE_FORMAT #4 Hard 6 MySQL CONCAT and DATE_FORMAT #5 Medium 7 MySQL CONCAT and DATE_FORMAT #6 Medium 8 MySQL CONCAT and DATE_FORMAT #7 Hard 9 MySQL CONCAT and DATE_FORMAT #8 Medium 10 MySQL CONCAT and DATE_FORMAT #9 Medium 11 MySQL CONCAT and DATE_FORMAT #10 Hard 12 MySQL CONCAT and DATE_FORMAT #11 Medium 13 MySQL CONCAT and DATE_FORMAT #12 Medium 14 MySQL CONCAT and DATE_FORMAT #13 Hard 15 MySQL CONCAT and DATE_FORMAT #14 Medium 16 MySQL CONCAT and DATE_FORMAT #15 Medium 17 MySQL CONCAT and DATE_FORMAT #16 Hard 18 MySQL CONCAT and DATE_FORMAT #17 Medium 19 MySQL CONCAT and DATE_FORMAT #18 Medium 20 MySQL CONCAT and DATE_FORMAT #19 Hard 21 MySQL CONCAT and DATE_FORMAT #20 Medium 22 MySQL CONCAT and DATE_FORMAT #21 Medium 23 MySQL CONCAT and DATE_FORMAT #22 Hard 24 MySQL CONCAT and DATE_FORMAT #23 Medium 25 MySQL CONCAT and DATE_FORMAT #24 Medium 26 MySQL CONCAT and DATE_FORMAT #25 Hard 27 MySQL CONCAT and DATE_FORMAT #26 Medium 28 MySQL CONCAT and DATE_FORMAT #27 Medium 29 MySQL CONCAT and DATE_FORMAT #28 Hard 30 MySQL CONCAT and DATE_FORMAT #29 Medium 31 MySQL CONCAT and DATE_FORMAT #30 Medium