Last year around this time, I was hired as a new data engineer and I bought both the instructor's SQL Foundation and Data Analysis lectures at the same time with the determination to watch them both. 'I don't have talent in this field.. I understand when I watch the lectures.. but why can't I get the feel for it when I actually work?' I started the instructor's SQL data analysis lecture yesterday after a year of going back and forth and reviewing only SQL Foundation. Moving averages and weighted averages... It's not easy for a beginner like me. ㅎㅎ I'm so glad it's unlimited..ㅎㅎ I haven't seen other data analysis SQL lectures, but I believe this lecture will be the easiest to explain, so I'll slowly and steadily finish it. If I had one wish, I'm unfamiliar with business accounting, statistics, such as sales, so it's too difficult to accumulate data by ETL in the direction that a BI analyst wants. ㅎㅎ I would be so happy if accounting, statistics, engineering mathematics, etc. came out at the level of SQL Foundation that anyone can see. Thank you so much for providing such a high-quality lecture at a low price. I'll always cheer you on!