> You may find that the PGQ component of skytools is what you want:
> http://pgfoundry.org/projects/skytools
> http://skytools.projects.postgresql.org/doc/
> http://skytools.projects.postgresql.org/doc/pgq-sql.html
>
Thanks, we will look into it. Still, I am surprised to learn that SQL as such cannot handle it. I do realize that the question is not trivial. Would setting transaction isolation level to SERIALIZABLE help in any way? Would locking of the entire table help in any way?
Nix.