通过货币换算获取每种产品类型的最低价格 [英] Get the minimum price of each product type with currency conversion
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问题描述
我想选择每种产品类型中最便宜的(包括运费,价格转换为当地货币).最便宜的 = (product.price + product.shipping) * Seller.to_aud
I would like to select the cheapest (including the cost of shipping, with prices converted to the local currency) of each of the product types. cheapest = (product.price + product.shipping) * seller.to_aud
我的数据库有如下表:
PRODUCTS SELLERS
----------------------------------------------- --------------------------
| id | type_id | seller_id | price | shipping | | id | currency | to_aud |
----------------------------------------------- --------------------------
| 1 | 1 | 1 | 10 | 5 | | 1 | usd | 0.9875 |
----------------------------------------------- --------------------------
| 2 | 1 | 2 | 10 | 2 | | 2 | gbp | 1.6000 |
----------------------------------------------- --------------------------
| 3 | 1 | 1 | 13 | 0 |
-----------------------------------------------
| 4 | 2 | 1 | 8 | 4 |
-----------------------------------------------
| 5 | 2 | 2 | 8 | 2 |
-----------------------------------------------
| 6 | 2 | 2 | 15 | 0 |
-----------------------------------------------
如果所有卖家都使用单一货币并且我不增加运费,我就能得到我想要的结果:
If all of the sellers used a single currency and I wasn't adding the cost of shipping, I could get the result I wanted with:
SELECT a.id, a.price
FROM
(
SELECT type_id, min(price) as minprice
FROM products
GROUP BY type_id
) AS b INNER JOIN products as a on a.type_id = b.type_id and a.price = b.minprice
ORDER BY price
但是我不知道从这里去哪里.任何帮助将不胜感激.
But I cannot figure out where to go from here. Any help would greatly appreciated.
推荐答案
SELECT a.id, a.price*ISNULL(s.to_aud,1) as minprice
FROM
(
SELECT type_id, min((price+shipping)) as minprice
FROM products
GROUP BY type_id
) AS b INNER JOIN products as a on a.type_id = b.type_id and (a.price+a.shipping) = b.minprice
Inner join sellers s on s.id = a.seller_id
ORDER BY price
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