mysql:如何对相乘的部分求和

mysql: how to sum multiplied partials(mysql:如何对相乘的部分求和)

问题描述

有如下表格:

已售商品:

code   | size   | quantity 
abc123 | small  | 4
abc123 | medium | 2  
xyz987 | small  | 3
xyz987 | medium | 1
xyz987 | large  | 2

价格表:

code   | size   | price 
abc123 | small  | 5
abc123 | medium | 7  
abc123 | large  | 9 
xyz987 | small  | 10
xyz987 | medium | 13
xyz987 | large  | 15

这将是您获得的最佳(更快的查询)方法

结果:

which would be your best (faster query) approach to get

results:

code   | sold_items | cash
abc123 | 6          | 34
xyz987 | 6          | 73

推荐答案

这应该可行:

 SELECT si.code, SUM(si.quantity), SUM(si.quantity * pl.price) as cash
 FROM sold_items si
 INNER JOIN price_list pl ON pl.code = si.code AND pl.size = si.size
 GROUP BY si.code

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