>When you build a DB do you really spend a lot of time thinking about set theory? How about 4th normal form? Or do you just do it? Are you talking about buildi

>When you build a DB do you really spend a lot of time thinking about set theory? How about 4th normal form? Or do you just do it? Are you talking about building a db (eg sqlite) or designing a database schema? 4NF seems only relevant to the latter. I'd certainly hope that the developers of sqlite consider set theory in designing their database implementation. Designing a schema is the application. Still valuable, but not exactly a the frontier of database research and development, which was exactly my point.