PostgreSQL — DDL & constraints

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