Epstein, Ed wrote:

> I am now completely lost on how to properly represent a null value in an
> external file if now even possible at all. Also, a null value inside of a
> number is an interesting question since those values do not have bytes in
> front of them to represent their length and 00 00 00 00 would represent 0 as
> an integer which is still a value.

Instead of loosing your time and nervers, take a look at the tool I
created just because I've had the same problems. Also, you can read
about external tables, NULLs and other beasts at the main page:

http://fbexport.sourceforge.net

HTH

--
Milan Babuskov
http://fbexport.sourceforge.net