MySQL 多重求和表

Question

来自以下 fiddle http://sqlfiddle.com/#!2/8f1d2/5我想将交叉表求和为下面的查询，但我遇到了 sale_event 的重复值的问题。你对此有什么想法吗？

SELECT
 a.province_id,
 SUM(a.sale_event) AS sale_eventTotal,
 SUM(d.order_fullpay) AS order_fullpayTotal
FROM
    san_activites a
LEFT JOIN
    sale_event_detail d
ON
    a.san_activity_id = d.san_activity_id
WHERE 
    a.entry_date BETWEEN '2014-7-1' AND '2014-7-30'
GROUP BY a.province_id

Answer 1

我能够得到我认为你想要的结果如下。结果返回
3 | 10
4 | 20

SELECT 
 SUM(a.sale_event) AS sale_eventTotal,
 SUM(d.order_fullpayTotal) AS order_fullpayTotal
FROM
    san_activites a
LEFT JOIN
    (select SUM(order_fullpay) AS order_fullpayTotal, san_activity_id from sale_event_detail group by san_activity_id) d
ON
    a.san_activity_id = d.san_activity_id
WHERE 
    a.entry_date BETWEEN '2014-7-1' AND '2014-7-30'
GROUP BY a.province_id

Fiddle