ALTER TABLE core_group_member ADD COLUMN group_id int(11) NOT NULL default 0;
ALTER TABLE core_group_member ADD COLUMN user_id int(11) NOT NULL default 0;
-ALTER TABLE core_group_member ADD UNIQUE KEY `unique_group_user` (`group_id`,`user_id`);
+ALTER TABLE core_group_member ADD UNIQUE KEY unique_group_user (group_id,user_id);