redhat man page for alter_group

ALTER 
GROUP(7)							   SQL Commands 						    ALTER GROUP(7)

NAME
       ALTER GROUP - add users to a group or remove users from a group

SYNOPSIS
       ALTER GROUP name ADD USER username [, ... ]
       ALTER GROUP name DROP USER username [, ... ]

   INPUTS
       name   The name of the group to modify.

       username
	      Users which are to be added or removed from the group. The user names must exist.

   OUTPUTS
       ALTER GROUP
	      Message returned if the alteration was successful.

DESCRIPTION
       ALTER  GROUP is used to add or remove users from a group. Only database superusers can use this command.  Adding a user to a group does not
       create the user. Similarly, removing a user from a group does not drop the user itself.

       Use CREATE GROUP [create_group(7)] to create a new group and DROP GROUP [drop_group(7)] to remove a group.

USAGE
       Add users to a group:

       ALTER GROUP staff ADD USER karl, john;

       Remove a user from a group:

       ALTER GROUP workers DROP USER beth;

COMPATIBILITY
   SQL92
       There is no ALTER GROUP statement in SQL92. The concept of roles is similar.

SQL - Language Statements					    2002-11-22							    ALTER GROUP(7)