Mitchell Hashimoto is partaking in Advent of Code this year and he’s added an extra facet to the challenge: implementing each solution with a single SQL statement.

I’m not an expert at SQL (or PostgreSQL) by any means. One of the reasons I decided to use SQL was to regain some proficiency while also learning some new concepts. I expect that many of my solutions are suboptimal and there are likely much better ways (by various definitions) to reach the same answer. I’d love to hear about those (make an issue) but I won’t be merging any changes since this represents my approach.

Sounds like a fun challenge! But how does he find the time? By timeboxing each problem to just 30 minutes.