● Create basic CRUD (create/read/update/delete) for all tables
/books /authors /author_book
● Show authors which are older 55 years old and sort them by born column
/authors/olderThan/55
● Return books whose author has more than 1 written books
/authors/bookMoreThan/1
● Find out author which has most books
/authors/mostBooks
● Calculate number of books by genre
/books/numberByGenre