Is it possible to use a PG sequence on a per record label?

Question

Does PostgreSQL 9.2+ provide any functionality to make it possible to generate a sequence that is namespaced to a particular value? For example:

 .. | user_i         


        

Answer 1

Yes:

CREATE TABLE your_table
(
    column type DEFAULT NEXTVAL(sequence_name),
    ...
);

More details here: http://www.postgresql.org/docs/9.2/static/ddl-default.html