This was the best course. I'm a non-major in my 40s working full-time who started preparing for data-related certifications and obtained ADsP and Big Data Analysis Engineer certifications through other programs on Inflearn, and now I'm preparing for SQLD. In actual work, I use SQL more often than Python, so I'm preparing for certifications with the goal of improving my work capabilities through certification studies. My goal is to obtain ADP and SQLP certifications in the future, and I need systematic preparation, so this course seems to be a perfect fit. I'm truly grateful to the instructor. I sincerely request an SQLP course as well.