Zend framework Zend如何使用自己的表字段值更新表值

如何在Zend DB表上执行此操作？像

UPDATE location AS main
  SET main.parent_location = 28, 
  main.description = CONCAT(
          (SELECT sub.description FROM wms_location AS sub WHERE sub.id_location=28), 
           main.designation
      ) 
WHERE main.id_location in (11, 14);

这可能吗

$table->update(
    "parent_location" => new Zend_Db_Expr(
        "CONCAT(" . (string)$subSelect . ", designation)"
    ),
    "id_location IN(11, 14)"
);

我不确定这些别名是否可能，是否需要它们