Valentin is right...
specially post by Usha Damarla in that
thread is worth reading/understanding once. I too beleive that these operators work that way.
(by the way, that thread was also started by you (Angela), didn't you follow that thread or still something is confusing ?).
Originally posted by Valentin Crettaz:
Hi Angela
There are some goog explanations here
Let know if you need more
Val