Re: CREATE USER and pg_user

On Tue, Aug 23, 2005 at 09:26:07AM +0800, William ZHANG wrote:
> ""Jim Nasby"" <jnasby@pervasive.com> write
> > Yes, but it doesn't really specify if you have to have a privilege in 
> > order to grant it, although reading one of the notes[1] tends to indicate 
> > that you must have a role in order to grant it. Unless I'm overlooking 
> > some part of the docs?
> 
> I am confused by the combination of USER and ROLE in 8.1 at first glance.
> In my memory, USER is a representation of somebody using the database,
> just as USER in OS. USER can also always login into the system, except
> the Admin prohibit it. ROLE is a collection of some priviledges. A USER
> can act as multiple ROLEs, but in real life, it cannot act as multiple ROLEs
> are the same time. That's why some system define that a USER can only
> act as one ROLE at a moment, but she can change her ROLE with
> "SET SESSION ROLE TO <anotherRole>".
> 
> Maybe I will read more about SQL:2003, pgsql-8.1 doc and RBAC
> (Role Based Access Control, 
> http://csrc.nist.gov/rbac/rbac-stds-roadmap.html)
> to understand it correctly.

You should take a look at
http://lnk.nu/developer.postgresql.org/3mi.html, both 17.1 and 17.2. In
particular:

"CREATE USER is equivalent to CREATE ROLE  except that CREATE USER
assumes LOGIN by default, while CREATE ROLE does not."
-- 
Jim C. Nasby, Sr. Engineering Consultant      jnasby@pervasive.com
Pervasive Software        http://pervasive.com        512-569-9461