查詢多個表的總和

我需要疑難問題的幫助。這與Spree Commerce平臺中實現的複雜方式優惠券有關。查詢多個表的總和

我只需要未付優惠券總額。

的表是：

偏好

id | value | key 
---+--------------------------------------------- 
1 | 25  | spree/calculator/flat_rate/amount/5

計算器

id | calculable_id | calculable_type 
----+---------------+----------------- 
5 | 3    | promotion_action

promotion_actions

id | activator_id 
----+------------- 
3 | 2

活化劑

個

id | expires_at | usage_limit 
---+------------+------------ 
2 | 2013-12-01 | 4

調整

originator_type | originator_id | amount 
-----------------+---------------+------- 
promotion_action | 3    | -25

在preferences.key最後一個數字對應於計算器的ID。

首先，我需要preferences.amount的總和乘以activators.usage_limit（除非activators.expires_at <今天），其中preferences.key LIKE'％calculator/flat_rate％'。

結果應該是這個數額減去相應adjustments.amount

的總和我得到儘可能

select 
(select sum(value) from spree_preferences 
    where `key` like "%calculator/flat_rate%") 
+ 
(select sum(amount) from spree_adjustments 
    where originator_type = 'promotion_action') as total;

，但這並不考慮expires_at和usage_limit。

對於更新的大禮包，答案如下：

select sum(subAggregate.outstanding) from ( select (subDetail.value * subDetail.multiplier) + subDetail.adjustmentAmount as outstanding from ( select p.value, case when a.expires_at > curDate() then a.usage_limit else 1 end as multiplier , ifNull(adj.amount,0) as adjustmentAmount from spree_preferences p left outer join spree_calculators c on replace(p.key,'spree/calculator/flat_rate/amount/','') = c.id left outer join spree_promotion_actions pa on c.calculable_id = pa.id and c.calculable_type = 'Spree::PromotionAction' left outer join spree_promotions a on pa.promotion_id = a.id left outer join spree_adjustments adj on pa.id = adj.source_id and pa.type = 'Spree::PromotionAction' ) subDetail ) subAggregate

來源

2013-04-03 lafeber

讓我們看看你已經嘗試什麼 –

這不是一個「做我的工作對我來說」的網站。向我們展示您的代碼無法運行的部分，我們可能會提供幫助。 – Bohemian

我已經展示了我有多遠。如果我對如何解決這個問題有任何線索，我都不會發布這個超長的問題。由於查詢太複雜，我可以完全理解你是否不想提供幫助。 – lafeber

select sum(subAggregate.outstanding) 
from 
    (
    select (subDetail.value * subDetail.multiplier) + subDetail.adjustmentAmount as outstanding 
    from 
     (
     select p.value, 
       case 
        when a.expires_at > curDate() then a.usage_limit 
        else 1 
       end as multiplier , 
       ifNull(adj.amount,0) as adjustmentAmount 
     from preferences p 
       left outer join calculators c 
        on replace(p.key,'spree/calculator/flat_rate/amount/','') = c.id 
       left outer join promotion_actions pa 
        on c.calculabel_id = pa.id 
        and c.calculable_type = 'promotion_action' 
       left outer join activators a 
        on pa.activator_id = a.id 
       left outer join adjustments adj 
        on pa.id = adj.originator_id 
        and pa.originator_type = 'promotion_action' 
     ) subDetail 
    ) subAggregate

來源

2013-04-03 14:52:54 jhinkley

查詢多個表的總和

回答

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