It is a declarative language like SQL. If you come from traditional imperative programming side, it is very difficult for you to get used to. I forgot who said

It is a declarative language like SQL. If you come from traditional imperative programming side, it is very difficult for you to get used to. I forgot who said it : "With imperative style, you code the precise steps to get what you want. With declarative style, you describe what you want and you let the language/runtime/OS/etc get it for you." If you're used to C/C++/Java, then SQL or Prolog seems frustrating, unnatural and non-intuitive. But once you have the eureka moment and realize they are declarative, you appreciate the elegance and power of SQL or Prolog.