The title of the lecture is Intermediate SQL and the lecture content is centered on examples, so I expected the content to be a little more helpful for practical use as a working developer, but it consists of only very basic content. Most of the HackerRank and Leetcode example problems only cover basic problems with an easy difficulty level, so I wonder why it is called Intermediate SQL. I expected Intermediate SQL to cover more complex and in-depth statistical analysis queries that are closer to practical use, such as using multiple tables with JOINs, aggregate functions, or subqueries. It was my fault for finding out later that the difficulty level of Inflearn's introduction was beginner, but it is a bit unfortunate that the title could be misunderstood as intermediate SQL. (I also don't understand why the title of Intermediate SQL is beginner difficulty.)