ALTER GROUP role_specification ADD USER user_name [, ... ]
ALTER GROUP role_specification DROP USER user_name [, ... ]
where role_specification can be:
ALTER GROUP group_name RENAME TO new_name
changes the attributes of a user group. This is an obsolete command, though still accepted for backwards compatibility, because groups (and users too) have been superseded by the more general concept of roles.
The first two variants add users to a group or remove them from a group. (Any role can play the part of either a
for this purpose.) These variants are effectively equivalent to granting or revoking membership in the role named as the
group; so the preferred way to do this is to use
The third variant changes the name of the group. This is exactly equivalent to renaming the role with
ALTER ROLE (ALTER_ROLE(7)).