I am leaving a review after completing the entire course. I signed up because it seemed like a practical course for non-experts, and I started with zero knowledge of SQL. As a beginner, I found it quite confusing because there were many minor inconsistencies between the problem descriptions and the actual query writing. For example, a problem would mention "Country," but the data only contained "City." These types of discrepancies appeared consistently throughout the course, making it very confusing when trying to understand each column. The explanations also felt a bit brushed over, which added to the fatigue as I had to double-check everything myself every time. Furthermore, including conditions that result in no data being returned made me constantly think I was doing something wrong. Regarding the practice problems, I was expecting a range of practical cases—from simple examples to more complex ones applicable to real-world tasks—but I feel I didn't get to experience enough variety for the price paid. Even after studying, I don't feel like I've built a solid foundation, so I think I'll have to take a basic course properly again. I wouldn't have been this disappointed if the price had been lower. I am leaving this long review because I believe the overall quality of the course needs improvement.