is often used to prepare for the removal of one or more roles. Because
does not affect objects within other databases, it is usually necessary to execute this command in each database that contains objects owned by a role that is to be removed.
requires privileges on both the source role(s) and the target role.
DROP OWNED (DROP_OWNED(7))
command is an alternative that simply drops all the database objects owned by one or more roles.
command does not affect any privileges granted to the
for objects that are not owned by them. Use
to revoke such privileges.
Section 20.4, Dropping Roles, in the documentation
for more discussion.