ALTER GROUP groupname ADD USER username [, ... ]
ALTER GROUP groupname DROP USER username [, ... ]

ALTER GROUP groupname RENAME TO newname

groupname

The name of the group to modify.

username

Users that are to be added to or removed from the group. The users must already exist; ALTER GROUP does not create or drop users.

newname

The new name of the group.

ALTER GROUP staff ADD USER karl, john;

ALTER GROUP workers DROP USER beth;