$sql .= ' AND target_course_code IS NULL AND cu.user_id = '.$user_info['user_id'].' AND c.code != '."'".$course_info['sysCode']."'".' ';
$sql .= ' AND target_course_code IS NULL AND cu.user_id = '.$user_info['user_id'].' AND c.code != '."'".$course_info['sysCode']."'".' ORDER BY title ASC';