Hello, this is Answer Helper. Soyun, this is a real site, so changes may occur frequently. I really wanted to give you a more realistic explanation with the real site. Also, we are updating the changed parts as quickly as possible with the data. Of course, the program must run mysql and the editor, but Python-based lectures only use Jupyter Notebook. We do not use different tools without special reasons. Most people know that Python is an Interpreter, so it seems difficult to understand this part. This lecture is for those who do not know MySQL, so it seems right to structure the lecture so that you can understand it from the beginning. However, if you do not know Python, the latter part may be difficult, so we have provided separate guidance for Python lectures for those who do not know Python. I think we should not make SQL lectures assuming that you know SQL to some extent like Soyun. Many people have already taken this lecture, so if there are any issues, the feedback may not have been good, so if there are any actual issues, please let me know and I will update it right away. This lecture is a continuation of the main lecture and the more complex machine learning deep learning lecture, so if the difficulty is adjusted step by step and the basic techniques are explained incorrectly, it would have been an issue since several years ago. If you have any difficulties, we will do our best to help you, so please do not misunderstand it too much.