It turns out I was wrong. To me SQL is easy to learn, but might take a long time to master. SQL is more than just those "select" statements, join, and aggregate. I'm sure someone can definitely write an entire book about join.
By the way I'm not even mention about database or database management system. SQL and Database is such a vast and interesting technology. There's always new thing to learn. Well, learning is what this blog is for. I don't claim myself as an expert; This blog is for me to blog about my hobby, SQL and database.
I realize that I can learn more by sharing my knowledge, and help other. Well let's the journey begin.