MySql查询根据其他列值求和行

Question

嘿，我有非常奇怪的逻辑可以帮助我编写查询。我想总结regOption的所有价格，其中regOption也有xnCoupon（优惠券和regOption共享相同的entry_id）。在这个exaple想要的数量是139。

|id         |trans_id|  entry_id    |type     | Price
------------------------------------------------------ 
|43575855   |24419612|  26898343    |regOption|  139         
|43575856   |24419612|  26898343    |xnCoupon |  50

|43575857   |24419612|  26898346    |regOption|  139         
|43575858   |24419612|  26898346    |Tshirt   |  10

在第二个例子中，想要的数量将是278

|id         |trans_id|  entry_id    |type     | Price
------------------------------------------------------ 
|43575855   |24419612|  26898343    |regOption|  139         
|43575856   |24419612|  26898343    |xnCoupon |  50

|43575857   |24419612|  26898346    |regOption|  139         
|43575858   |24419612|  26898346    |xnCoupon |  50

我的尝试就像这样

Select sum(price) FROM table where type ='regOption' AND (something)检查是否与相同的entry_id与xnCoupon相关的regOption？

有人可以帮我逻辑，欢迎任何帮助

Answer 1

SELECT SUM(price) 
FROM table 
WHERE type = 'regOption' 
AND entry_id IN
(
    SELECT entry_id 
    FROM table 
    WHERE type = 'xnCoupon'
)

Answer 2

这可能不是您所期待的 - 此声明将regOption类型的价格与每笔交易的相应xnCoupon相加并给出总计。

select ifnull(reg.trans_id,'<<TOTAL>>') as trans_id,
       sum(reg.price)
  from `table` reg
  join `table` xnc
        on (   xnc.entry_id = reg.entry_id
           and reg.type = 'regOption'
           and xnc.type = 'xnCoupon')
 group by reg.trans_id with rollup;