Ask HN: A job interview will focus on PostgreSQL/Redshift. How do I learn these?

I think of myself as someone who can learn new things faster than average, so I think I should be fine. Some guidance would be really helpful though, as I'm not sure what the most important topics to cover are. I do use PostgreSQL, actually, but I mostly interact with it through the Django ORM, or SQLAlchemy. Time to time I hop into the database shell, but my knowledge there only reaches up to simple joins, and even those with consulting the psql docs to get the syntax right. I also haven't really dealt with databases with over even 1k rows.

What are the most important topics to cover? All I know about the interview is what I have in the title, practically.

For reference, I typically use Python, and NoSQL data stores. Redis and Elasticsearch are my main tools of the trade right now for data.