I was a bit weak in SQL, so I was studying by purchasing various SQL books when a friend gave me a pre-revision version of a book called "Database Introduction with Oracle," which led me to find this course. I felt that this textbook was definitely more comfortable to read in terms of table of contents and flow compared to the SQL-related books I had purchased and studied before, so I thought since I'm going to study during vacation anyway, I might as well study with the revised edition. So I purchased the revised edition and am currently studying with the course... To get straight to the point, it's so good!! I'm definitely going to recommend this course first to everyone around me who says they're studying SQL. Because first of all, the textbook itself has a well-structured curriculum flow that's easy to read. For example, other SQL textbooks... In Chapter 1, they cover database theory, what relational databases are, database types, DBMS history, and all these theories, and for someone like me who lacks concentration, I get completely drained early on and end up not wanting to continue and getting exhausted. But this book just touches on the really important basic theoretical concepts at the beginning, skipping things like history, and immediately moves to hands-on practice, so the progression is speedy and good. At first, I wondered if I could listen to all the lectures because there were so many hours, but the reason for the long lecture time wasn't because it was like "pause the screen and follow along, you all followed along, right? I trust you followed along... next~" but because they actually provided separate practice time with a timer. If you subtract this timer time, the lecture time would probably be cut in half...? But providing separate practice time like this was really refreshing. In my case, I often pause the lecture midway and follow along a bit, then get distracted by other things, but since they give time with a timer without stopping the online lecture, I could focus entirely on practicing, which was great. Plus, while the practice time was actually a bit short at the beginning, later on I could follow along within that practice time, and the sense of achievement from that was really truly satisfying. Moreover, they explain really important functions used in actual work in great detail, and there are problems to solve at the end of each chapter, and they explain all of those too, which was so good..!! They could have just skipped over it since everything was already explained in the previous material, but the detail of solving each problem one by one - you can definitely tell that the author who wrote the textbook directly is giving the lectures, so I could clearly receive the content and core intentions emphasized in the book through the lectures, and I understood why the lecture time was long. And when you listen, it doesn't actually take that much longer than other lectures..! The time spent pausing lectures and getting distracted while following along with practice was reduced!! 😆😆 I tend to only write reviews for lectures that really moved me... and among those, this is probably the first time I've written such a long review for a lecture 😆😆 If you're like me with poor concentration and can't finish reading a book completely, you'll be able to finish it completely if you study while taking this course. I have the last 5 lectures left now, and I'll finish listening to them all today and prepare for the new semester. Fighting to all university students across the country 💪 😆😆