For those new to SQL you have a number of online courses and tutorials to select from in order to level up your knowledge.
- https://www.pgexercises.com
- https://sqlbolt.com
- https://khanacademy.org/computing/computer-programming/sql
- http://sqlzoo.net/
The challenge is to capture a number of "flags" by importing the datasets we've provided and finding the answers below.