I took this course because I needed Spark for work. Not only is the content great, but the instructor's teaching skills are also excellent 😊😊 I will take all of your other courses as well. Thank you for uploading such a great course. Please upload more!

This was a lecture where I learned so much. I was always vaguely curious about what kind of data analysis work DBAs do, and this was an opportunity to broaden my thinking about their role. I also learned more about SQL that I had been using without really understanding. Especially, analyzing channels through sessions was really fascinating. So that's how they collect data..!! Since I'm still at a junior level, everything felt so new and interesting. I'll study harder. Thank you, Giyong!!

Although it's a short lecture, it makes me think about many things.

I gained a lot of learning. Thank you very much.