如何处理大型mysql查询

四季發財

我有以下查询：
SELECT  p2c.pid AS productNumber,
      p.name AS productName
, (
         SELECT COUNT(*)
         FROM products2customers
         WHERE  pid = p2c.pid
      ) AS registered
, (
         SELECT COUNT(*)
         FROM products2customers
         WHERE  pid = p2c.pid
            AND date_add(from_unixtime(purchased), INTERVAL 5 YEAR) >= CURDATE()
      ) AS inWarranty
, (
         SELECT COUNT(*)
         FROM products2customers
         WHERE  pid = p2c.pid
            AND date_add(from_unixtime(purchased), INTERVAL 5 YEAR) 查询在具有25.000行的数据库表上执行。该查询的执行时间约为40秒。结果将显示在网页上，因此等待40秒以获取结果并不是很好。
有没有一种方法可以执行此查询并保存其输出？因为如果每天晚上执行此查询就足够了。
最好的方法是什么？我应该创建一个cronjob并执行此查询并将结果写入数据库吗？或者，还有更好的方法？
或者我可以优化此查询以使其更快？

解决方案:


            我认为所有这些相关的子查询都在杀死。试试这个：
SELECT  p2c.pid AS productNumber,
      p.name AS productName,
      COUNT(*) AS registered,
      SUM(date_add(from_unixtime(purchased), INTERVAL 5 YEAR) >= CURDATE()) AS inWarranty,
      SUM(date_add(from_unixtime(purchased), INTERVAL 5 YEAR) < CURDATE()) AS outOfWarranty,
      DATE_FORMAT( MAX( from_unixtime(purchased) ), '%d.%m.%Y') AS lastPurchased,
      DATE_FORMAT( date_add( MAX( from_unixtime(purchased) ), INTERVAL 5 YEAR), '%d.%m.%Y') AS warrantyUntil
FROM products2customers p2c
JOIN products p ON p.id = p2c.pid
GROUP BY p2c.pid
ORDER BY inWarranty DESC

如何处理大型mysql查询

四季發財 LV1