As a non-major preparing for a career change to the IT industry, I really felt the need to study SQL, and I learned about this course through a friend's recommendation. After taking the course, I understood why they recommended this book and course. It was great to be able to learn focusing on the core grammar essential for practical work, and the process of naturally learning through repeating examples and solutions was a huge help. The instructor's explanations were also Kind and easy to understand, so it wasn't difficult to follow along, and it was really meaningful to be able to feel the actual work experience. When I studied only with books, it wasn't easy to keep going consistently on my own, but like other reviews mentioned, having you display the stopwatch and give us time to solve problems made it feel like taking a real-time class even though it was an online course, which was really great👍 Thanks to this, I wasn't bored throughout my studies, and even as a non-major, I was able to gradually gain confidence. I think choosing to take the course instead of just reading the book was a really good decision! Thank you for being such a great help in my job change preparation, and now I'm going to go through it thoroughly one more time :D