Hello young pyo lee, thank you for your evaluation and feedback!! I think that in modern times, it's not just about simple database usage that's important. I believe what matters is whether you can do something derived through that database. From this perspective, I filmed the lecture and wanted to share a very broad range of perspectives with you all. As a result, it seems like there ended up being quite a lot of abstract concepts. Next time, I will work even harder to provide you with a more satisfying lecture. Thank you for taking the time to leave this review!!