Re: Re: Re: Re: [firebird-support] Is there any logical difference?

[liviuslivius liviusliv...@poczta.onet.pl [firebird-support]]

It looks like the issue does not exists.
I have thinked that i compare
 
NOT 
     (
     EXISTS()
     OR
     EXISTS()
     )
 
but this was really NOT EXISTS AND SOMETHING or EXISTS
 
and logic table for "NOT EXISTS AND SOMETHING" is:
 
false and NULL = false 
but 
true and NULL = NULL 
 
which is now understandable
 
thank you for your time
Karol Bieniaszewski