我如何在 1 table 中加入不同的筛选区域

Question

我正在尝试从 table 命名订单中查找物流公司和货运公司的综合表现。我写了一个工作代码，但它运行缓慢，我希望它运行得更快。

工作代码是;

'SELECT 
a.*,
b.number_of_order_lost_or_damaged,
c.number_of_order_lost_tracking FROM
(SELECT 
    logistic_partner,
        cargo_partner,
        round(AVG(DATEDIFF(date_delivered, date_add)),2) as time_spent_in_delivery
FROM
    orders
WHERE
    status IN (6)
GROUP BY logistic_partner , cargo_partner) a
    JOIN
(SELECT 
    logistic_partner,
        cargo_partner,
        COUNT(id) AS number_of_order_lost_or_damaged
FROM
    orders
WHERE
    status IN (8)
GROUP BY logistic_partner , cargo_partner) b USING (logistic_partner , cargo_partner)
    JOIN
(SELECT 
    logistic_partner,
        cargo_partner,
        COUNT(id) AS number_of_order_lost_tracking
FROM
    orders
WHERE
    status IN (10)
GROUP BY logistic_partner , cargo_partner) c USING (logistic_partner , cargo_partner);'

无效代码是

'SELECT 
o.logistic_partner,
o.cargo_partner,
round(AVG(DATEDIFF(a.date_delivered, a.date_add)),2) as time_spent_in_delivery,
count(b.id),
count(c.id) FROM orders o
    JOIN orders a on a.id=o.id and a.status = 6
    JOIN orders b on o.id=b.id and b.status = 8 
    JOIn orders c on c.id=o.id and c.status = 10
GROUP BY logistic_partner , cargo_partner;'

但它们是分开工作的：

'SELECT 
o.logistic_partner,
o.cargo_partner,
round(AVG(DATEDIFF(a.date_delivered, a.date_add)),2) as time_spent_in_delivery FROM orders o
    JOIN orders a on a.id=o.id and a.status = 6
GROUP BY logistic_partner , cargo_partner;'

或

SELECT 
o.logistic_partner,
o.cargo_partner,
count(b.id) FROM orders o
    JOIN orders b on o.id=b.id and b.status = 8 
GROUP BY logistic_partner , cargo_partner;

可能是什么问题？

Answer 1

我猜您不需要任何这些派生表。使用条件聚合应该会产生相同的结果。例如：

SELECT logistic_partner
      , cargo_partner
      , ROUND(AVG(IF(status = 6, DATEDIFF(date_delivered, date_add), NULL)),2) AS time_spent_in_delivery
      , SUM( IF( status = 8, 1, 0) ) AS number_of_order_lost_or_damaged
      , SUM( IF( status = 10, 1, 0) ) AS number_of_order_lost_tracking
FROM  orders
GROUP BY logistic_partner
       , cargo_partner

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