I am a 6-year SI developer who mainly uses MyBatis when dealing with SQL. I studied JPA at first because I wanted to avoid the inevitable human errors that occur after using MyBatis for a long time. I felt the charm of JPA when managing tables with entities without directly writing DDL and when writing C, U, D. However, I was losing my motivation to learn due to the disadvantages of writing SELECT statements and the strangely unfamiliar JPQL (if you use it, you risk having to carry human errors as they are...) and then I found out about this lecture. (I also tried QueryDSL, but I wondered if it was okay because it had not been maintained for a long time... ㅠㅠ) The introduction was long when writing a jOOQ course review, but in conclusion, I really liked this course. As someone who likes writing SQL, I thought that JOOQ, which reduces human errors and creates queries in a similar way to SQL, was the perfect technology for me. Thank you for the great lecture.