I was looking for a cheaper course, so I looked at the curriculum, but it lacked information on indexes. So I skipped that course and chose this one... Wow~ It explains everything about DB from beginning to end in detail. The 'Index Analysis' part of the course is a rich content that is hard to find anywhere else. You can trace the data structure and see it with your own eyes at the end.. Awesome!! It even gives you a taste of Redis.. I'm just going to keep listening to this person's course series. I want to give it more than 5 stars. ^^