Alter Group Statement
The alter group statement modifies the list of users associated with a group identifier. Individual users can be added or dropped or the entire list can be dropped.
An add and a drop operation cannot be performed in the same alter group statement.
This statement has the following syntax:
alter group group_id {, group_id}
add users (user_id {, user_id}) | drop users (user_id {, user_id}) | drop all;