Zf2表网关连接查询仅从第二个表中获取最新行（按id）

Question

嗨，我需要一个zf2连接查询，它只从第二个表中获取最新的一行（通过id DESC）。我写了一个sql查询，但它确实有效。

SELECT st1.customer_id,
    st1.id
  FROM status st1
  inner JOIN 
  (
    SELECT max(id) MaxId, customer_id
    FROM status
    GROUP BY customer_id
  ) st2
    ON st1.customer_id = st2.customer_id
    AND st1.id = st2.MaxId

但是我需要在zend framework 2表网关格式中进行此查询。请帮忙。

Answer 1

    use Zend\Db\Sql\Select;
    use Zend\Db\Sql\Expression;

    $sql = new Select ();
    $sql->columns(["customer_id", new Expression ("max(id) AS MaxId")])
        ->from ('status')
        ->group('customer_id');

    $outer = new Select ();
    $outer->columns (['customer_id', 'id'])
        ->from (['st1' => 'status'])
        ->join (['st2' => $sql], 
             'st1.customer_id = st2.customer_id AND st1.id = st2.MaxId', []);