> 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.



      

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