public static function get_id_column(string $column, string $table): ?string
  {
    if (
      ($db = self::_get_db()) &&
      ($full_table = $db->tfn($table)) &&
      ($databases_obj = self::_get_databases())
    ){
      [$database, $table] = explode('.', $full_table);
      return $databases_obj->column_id($column, $table, $database, self::$db->host);
    }
    return false;
  }