> >> update t1 set a = a+b, b = a-b, a = a-b;
> >
> > This won't work in the next FB version, so I wouldn't rely on this
> > approach.

Why not? :-)

Martijn Tonies
Database Workbench - development tool for Firebird and more!
Upscene Productions
http://www.upscene.com
My thoughts:
http://blog.upscene.com/martijn/
Database development questions? Check the forum!
http://www.databasedevelopmentforum.com