first: I didn't say rdbms, I said database. that covers nosql as well. second: even if you don't have an explicit schema in the database, you still have to hav

first: I didn't say rdbms, I said database. that covers nosql as well. second: even if you don't have an explicit schema in the database, you still have to have a way to know which data goes in which column. just because it isn't written in a definition language doesn't mean the concept doesn't exist and doesn't require to be maintained as the application domain evolves.