This challenge hub contains an answer-oriented recreation of some of the AquaQ Friday Challenges.

The challenges are designed to puzzle someone using KDB+, and once you provide a correct answer, we'll provide a suggested KDB+ approach. Answer as many as you can, collect a few badges (visible on your profile, and if you like, show off on the leaderboard (though keep in mind you won't show up until you've completed at least one challenge!). No record is kept of attempts beyond the time of your last one, nor are wrong answers kept.

Rate the challenge difficulty as you complete them, or as you work on them - you don't have to finish one to rate it!


Sometimes it might seem like you can't get the right answer:
If you've tried all of the above but think there is a flaw in the question, email me. There might actually be a mistake!