SQL構文のエラーを修正する方法

Question

このエラーで私を助けてください：

Notice: Error: You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near 'c FROM oc_coupon c LEFT JOIN oc_cheaper_order_coupons coc using(coupon_id) WHER' at line 1 Error No: 1064 DELETE oc_coupon c FROM oc_coupon c LEFT JOIN oc_cheaper_order_coupons coc using(coupon_id) WHERE coc.order_id = '26' in /home/blablabl/public_html/shop/system/database/mysql.php on line 50

をコードは次のとおりです。

class ModelSaleCheaper extends Model { 
    public function deleteOrder($order_id) { 
     $this->db->query("DELETE " . DB_PREFIX . "coupon c FROM " . DB_PREFIX . "coupon c LEFT JOIN " . DB_PREFIX . "cheaper_order_coupons coc using(coupon_id) WHERE coc.order_id = '" . (int)$order_id . "'"); 
     $this->db->query("DELETE " . DB_PREFIX . "coupon_product cp FROM " . DB_PREFIX . "coupon_product cp LEFT JOIN " . DB_PREFIX . "cheaper_order_coupons coc using(coupon_id) WHERE coc.order_id = '" . (int)$order_id . "'"); 
     $this->db->query("DELETE FROM " . DB_PREFIX . "cheaper_order_coupons WHERE order_id = '" . (int)$order_id . "'"); 
     $this->db->query("DELETE FROM " . DB_PREFIX . "cheaper_order WHERE order_id = '" . (int)$order_id . "'"); 

Answer 1

有効なクエリは次のようになります。

DELETE c -- assuming you only want to DELETE from coupon 
    FROM " . DB_PREFIX . "coupon c 
    JOIN " . DB_PREFIX . "cheaper_order_coupons coc USING(coupon_id) 
WHERE coc.order_id = $order_id; 

別の例...

DELETE cp 
    FROM oc_coupon_product cp 
    JOIN oc_cheaper_order_coupons coc USING(coupon_id) 
WHERE coc.order_id = 26