title: Have you ever worked with Database no "Relations", no "PKs", and no "FKs", just raw data?
body: <p>Nowadays, I'm working on a database, with no "Relations, PKs and FKs", just
  raw data.
  I can say that database is just set of papers.
  When I asked about this, I had this; "Hide the Business".</p>
  
  <p>Also, one of my friends said, this always happens in "Large systems".</p>
  
  <p>In large systems, they are tyring to hide thier business through raw data.
  Regarding development; relations, constraints, validation, are done in database using triggers and of course user interface.</p>
  
  <p>What do you think regarding this?</p>