For reference, I’m a DBRE. IMO, yes, most people can learn basic joins and aggregates in a couple of hours, but that is subjective.

> you don’t need to understand the normalizations

You definitely should. Normalizing isn’t that difficult of a concept, Wikipedia has terrific descriptions of each level.

As to the rest, maybe read docs? This is my primary frustration with LLMs in general: people seem to believe that they’re just as good of developers as someone who has read the source documentation, because a robot told them the answer. If you don’t understand what you’re doing, you cannot possibly understand the implications and trade-offs.