1. Database Truth of the Week “… logic—is an analytical theory of the art of reasoning whose goal is to systematize and codify principle...

See: Physical Independence Part 1: Don't Mix Model with Implementation

Database Truth of the Week "... systems of operations on data are most effective when they are formalisms, in which semantic consi...

There is nothing wrong with Hugo Kornelis' picture of SQL NULL in NULL: The database's black hole . In fact, I recommend the series ...

1. What's wrong with this picture? "Things get more complex when NULLable columns are used in expressions and predicates. In ...

The data management field cannot and will not progress without educated and informed users. Recently I announced UNDERSTANDING THE REAL RDM,...

(This is a rewrite of a 12/10/16 post , to bring it in line with McGoveran's interpretation of Codd's RDM.) Here's what's...