I have some time to kill before having to run some errands. I've started with the first one and it's pretty fun!
Said "fuck yeah" a couple times to myself when I got the answer right. I've not used SQL before but I've got a decent grasp (as in I get the basics) on programming languages so it's somewhat intuitive to me
Thanks for the links!! I look forward to continuing when I get back
seems like there's an issue with case 3. the person_id and from surveillance_records doesn't match up with the person_id in the hotel_checkins table when joined on hotel-checkin_id