Thanks for your reply, Cimode. I appreciate it.

With all my respect to all participants of this forum, I would like to ask Cimode few questions about how to handle situations below:

Scenario #1. Say, we need to create...

There are my two cents in support of NULLs.

I totally agree with hawq and others - NULLs are the part of database logic and one, sometimes, cannot avoid them,...