更新PDO查詢的選項

Question

我如何更新此查詢？ 我嘗試獲得超過1種產品的所有類別，計算此產品以顯示在她身邊，但我的查詢太慢（2s）。如果可能，我該如何做，但更快？

SELECT 
    C.id, C.name, C.id_dept, C.cat_type, C.num_prod 
FROM 
    (SELECT 
     C.id, C.name, C.id_dept, C.cat_type, 
     COALESCE((SELECT count(P.id) FROM Products P WHERE P.status = 1 AND P.promo = 1 AND P.id_cat = C.id), 0) AS num_prod 
    FROM 
     Products_Cat C 
    ) C 
WHERE 
    C.num_prod > 0 AND C.cat_type = 1 AND C.id_dept = '{IDD}' 
    ORDER BY C.name ASC 

Answer 1

更新PHP PDO

$sql = $db->prepare("UPDATE `Products` set `name` = :name, `id_dept` = :id_dept, `cat_type` = :cat_type WHERE status = 1 AND promo = 1); 
//bind all parameters 
$sql->bindParam(':name',$name); 
. 
. 
. 
$sql->execute();