"nabakumar salam" <salamnabakumar@gmail.com> writes:
> I was expecting that it would not allow removing that super user rights as
> it is the only super user in my DB.
Superusers are assumed to be careful enough not to shoot themselves in
the foot like that. I suggest not experimenting with things like
"delete from pg_proc;" either ;-)
> now my database is without any user with super user rights.
> How do I create one now or get back the previous super user?
Shut down the postmaster, start a standalone backend, create a superuser
using CREATE USER, restart the postmaster. You're always super inside
a standalone backend.
regards, tom lane