ALTER GROUP SQL - Language Statements ALTER GROUP change a user group ALTER 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.