I used to study SQL theory for another exam, but I needed practical database skills, so I took the class. I could see that the instructor who taught the class cared about the students. It was impressive that he helped us organize the content by reviewing the topics we had learned. He also helped us review the content by solving SQL problems together. If you are a beginner in SQL, I think it would be better to read the provided course materials and watch the class. Thank you to the instructor for creating such a high-quality class. If there is an advanced course, I will definitely take it.