Each lecture was short, and I was able to concentrate and listen well because it only taught the key points. I'm so touched that even I, who can't finish the course every time, was able to finish it in 3 days.. DB design has always felt like an ambiguous area, but this lecture scratched the itchy parts exactly. Thank you for teaching so easily. I'll practice a lot on my own while listening to the lecture!!!!! (P.S. If you release beginner, intermediate, and advanced lectures, I definitely want to take them!!!!..!)