Quote of the day and Tree data structures in the database

The quote of the day:

The number 1 fear is speaking in front of others. Number 2 is death. Number 2. That means if you're at a funeral, you'd rather be in the coffin instead of giving the eulogy.

- Jerry Seinfield

And an advanced talk from Lorenzo Alberton :~140 pages about trees in sql

http://www.alberton.info/talks_dpc_2009_wrapup.html

http://www.alberton.info/talks
CTE can be used in firebird too
http://pabloj.blogspot.com/2008/01/new-challenges-new-synthax.html