This is not true for any non-trivial database. I had to learn this. Business logic still has to be understood, there is still lot's of domain knowlege how this

This is not true for any non-trivial database. I had to learn this. Business logic still has to be understood, there is still lot's of domain knowlege how this is indented to be used and how not, and in my case there was still lot's of ambigous, poorly documented VBA-Code to be understood. I'm not aware of a database without a frontend of some kind.