JOIN

I’ve been going on and on about esoteric Postgres features for so long, sometimes I forget my own neophyte beginnings. So let’s back way off and talk about how JOINs work. What are they? What do they do? Why would you use one? What can go wrong? It’s easier than you might imagine, but there are definitely some subtleties to account for. To make this more relatable, let’s start with a club of pet owners that likes to keep track of everything: