Seconding Widom's course. It's a fantastic primer on databases. I did it during the first run, back in like 2011 or 2012 or so. I can't imagine it's gotten a

Seconding Widom's course. It's a fantastic primer on databases. I did it during the first run, back in like 2011 or 2012 or so. I can't imagine it's gotten any less relevant in the intervening years.