Mysql多组和订单很慢[关闭]

Question

我正在尝试优化用于电子商务的 mysql 查询 - 自定义商店，该查询有一些内部连接和分组依据，这使得查询非常慢，我们正在使用它来生成类别的动态过滤器/组合、供应商、颜色等。

有人知道如何优化它吗？ 一方面，我无法使 products(p) 表使用多索引而不是主键，查询大约需要 150-200 毫秒。

确切的查询：

SELECT DISTINCT(sl.id_supplier), 
       count(DISTINCT p.id_product) as product_count, 
       sl.supplier_name, 
       sl.supplier_slug, 
       sl.supplier_link 
FROM supplier s 
INNER JOIN supplier_lang sl 
  on s.id_supplier = sl.id_supplier 
  AND sl.id_project = 6 
  AND sl.id_lang =2 
  AND s.id_project = 6 
  AND s.active = 1 
INNER JOIN product p 
  ON p.id_project = 6 
  and p.active = 1 
  AND p.id_supplier = sl.id_supplier 
INNER JOIN product_category pc 
  on pc.id_project = 6 
  and pc.id_category = 6 
  and p.id_product = pc.id_product  
GROUP by sl.id_supplier 
ORDER BY sl.supplier_name ASC

谢谢

https://snag.gy/F6dy4r.jpg

Answer 1

虽然上面有一个隐式的函数依赖，但我认为这样的查询看起来更像这样是一种很好的做法（并且通常会期望）：

SELECT sl.id_supplier
     , sl.supplier_name
     , sl.supplier_slug
     , sl.supplier_link 
     , COUNT(DISTINCT p.id_product) product_count 
  FROM supplier s 

  JOIN supplier_lang sl 
    ON sl.id_supplier = s.id_supplier 
   AND sl.id_project = s.id_project 
   AND sl.id_lang = 2 

  JOIN product p  
    ON p.id_supplier = sl.id_supplier 
   AND p.id_project = s.id_project  
   AND p.active = 1 

  JOIN product_category pc 
    ON pc.id_product = p.id_product 
   AND pc.id_project = p.id_project 
   AND pc.id_category = 6 

 WHERE s.id_project = 6 
   AND s.active = 1 

 GROUP 
    BY sl.id_supplier 
     , sl.supplier_name
     , sl.supplier_slug
     , sl.supplier_link 
 ORDER 
    BY sl.supplier_name ASC

为了帮助优化这个查询，我们需要查看所有相关表的 SHOW CREATE TABLE 语句以及上述的 EXPLAIN。这将是对您的问题进行编辑的形式，并且不会包含任何图片。