[raverbashing]

Exactly

Relational DBs may even be the wrong choice for some specific problems.

And about this quote from the article: "At some point, you will need to ask your primary database questions. If you chose the wrong database, this is where things get tricky. "

Yes, this is correct. However, I know how to read the manual of whatever db I'm using and maybe code something simple to process the output to the format of my liking.