Thank you for the great lecture. I took Oracle classes elsewhere before, but I forgot them after a long time, or I was curious about them but just passed them by, and it was very helpful. As with most lectures, since the lectures are structured from understanding the concept -> practice, they don't cover many examples, so for those who are completely new to Oracle, don't just try the examples that come out and move on, but practice changing them into queries that you want. Since the basic grammar is actually the most frequently used and widely used grammar, if you don't make sure of the contents that come up in the beginning, you'll get more and more mentally broken as you go on, I think it's the same for any language.. Since you tend to speak slowly, it's good to listen at 1.5x or 2x speed because it saves time. ㅋㅋㅋㅋ I think it would be good to focus on the DML/DDL and PL/SQL parts. I'm going to take the second half..