> "To give an analogy, imagine libraries saying they are doing away with the Dewey Decimal System and just throwing the books into a big hole in the ground and

> "To give an analogy, imagine libraries saying they are doing away with the Dewey Decimal System and just throwing the books into a big hole in the ground and declaring it a better system because it is way less work for the librarians" No, to give an analogy imagine a library where the librarian only accepts books which are below a given size, have a specific color and weight, and he rejects any books which have even a cm bigger size, a different color or it's just a gram heavier. Also from time to time (let's say each month) the librarians are sitting together to decide what other books shall they accept (sometimes extending (and by that inherently limiting) the acceptable ranges to other properties like title or smell). Also to give a good analogy the librarians also reject those books which are returned without their softcover. That's RDBMS for you. It works, but not everyone is satisfied with such a service.