PostgreSQL — Aggregates & GROUP BY

1 PostgreSQL SELECT with ILIKE Easy 2 PostgreSQL GROUP BY HAVING #1 Hard 3 PostgreSQL GROUP BY HAVING #2 Medium 4 PostgreSQL GROUP BY HAVING #3 Medium 5 PostgreSQL GROUP BY HAVING #4 Hard 6 PostgreSQL GROUP BY HAVING #5 Medium 7 PostgreSQL GROUP BY HAVING #6 Medium 8 PostgreSQL GROUP BY HAVING #7 Hard 9 PostgreSQL GROUP BY HAVING #8 Medium 10 PostgreSQL GROUP BY HAVING #9 Medium 11 PostgreSQL GROUP BY HAVING #10 Hard 12 PostgreSQL GROUP BY HAVING #11 Medium 13 PostgreSQL GROUP BY HAVING #12 Medium 14 PostgreSQL GROUP BY HAVING #13 Hard 15 PostgreSQL GROUP BY HAVING #14 Medium 16 PostgreSQL GROUP BY HAVING #15 Medium 17 PostgreSQL GROUP BY HAVING #16 Hard 18 PostgreSQL GROUP BY HAVING #17 Medium 19 PostgreSQL GROUP BY HAVING #18 Medium 20 PostgreSQL GROUP BY HAVING #19 Hard 21 PostgreSQL GROUP BY HAVING #20 Medium 22 PostgreSQL GROUP BY HAVING #21 Medium 23 PostgreSQL GROUP BY HAVING #22 Hard 24 PostgreSQL GROUP BY HAVING #23 Medium 25 PostgreSQL GROUP BY HAVING #24 Medium 26 PostgreSQL GROUP BY HAVING #25 Hard 27 PostgreSQL GROUP BY HAVING #26 Medium 28 PostgreSQL GROUP BY HAVING #27 Medium 29 PostgreSQL GROUP BY HAVING #28 Hard 30 PostgreSQL GROUP BY HAVING #29 Medium 31 PostgreSQL GROUP BY HAVING #30 Medium