PostgreSQL 8.0.1 Documentation
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ALTER GROUP

Name

ALTER GROUP -- change a user group

ALTER GROUP groupname ADD USER username [, ... ]ALTER GROUP groupname DROP USER username [, ... ]ALTER GROUP groupname RENAME TO newname

ALTER GROUP changes the attributes of a user group.

The first two variants add users to a group or remove them from a group. Only database superusers can use this command.

The third variant changes the name of the group. Only a database superuser can rename groups.

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.

Add users to a group:

ALTER GROUP staff ADD USER karl, john;

Remove a user from a group:

ALTER GROUP workers DROP USER beth;

There is no ALTER GROUP statement in the SQL standard. The concept of roles is similar.