Hello lætitia,
My 0.02 € to try to simplify the suggested documentation.
> Check constraint were not
are not
> designed to enforce business rules across tables.
> Avoid using check constraints with function accessing to other tables
accessing other tables (no "to")
> and prefer triggers instead (please refer to <xref linkend="triggers"/>
> for more information about triggers).
... and use <xref linkend="triggers"/> instead.
> PostgreSQL won't prevent you from doing so,
Although PostgreSQL ... so,
> but be aware you might encounter difficulties to restore dumps
> (generated with pg_dump or pg_dumpall) if you do.
beware that dumps generated by <application>pg_*<...> or <...> may be hard
to restore because of such checks, as the underlying dependencies are not
taken into account.
--
Fabien.