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!!