如何计算 SQL 服务器中某些特定产品类型的收益？

Question

所以，这是我的表格：

销售额

id	product_code
1	4536
2	4674

产品

product_code	product_name	price	real_price
4536	Red bull energy drink 300 ml	3,68	2,88
4674	Mac coffee 25 gr	2,59	2,10

我需要计算我从名称中带有“Red Bull”的产品中获得了多少收益。效益等于price-real_price.

预期输出：

product_name	benefit
Red bull energy drink 300 ml	4536,4

这是我尝试过的：

SELECT products.product_code,(price-real_price) as profit
FROM products
INNER JOIN sales
ON products.product_code = sales.product_code
outer apply (select count(*) 
            from sales as benefit
where product_name like '%red bull';

但是它没有给我想要的输出。

Answer 1

正如您所说，每一行都是一个已售出的数量，下面的查询就可以完成这项工作。
我建议最好在sales table.

中有一个数量栏

select
  p.product_code,
  p.product_name,
  count(s.product_code) as quantity_sold,
  sum( (p.price-p.real_price)*count(s.product_code) as total_profit
from products p 
join sales s on s.product_code = p.product_code
where p.product_name like '%red bull'
group by
  p.product_code,
  p.product_name;

Answer 2

create table Sales (
   id int, 
   product_code int)

create table Products(
   product_code int,
   product_name char(100),
   price smallmoney,
   real_price smallmoney)

insert into Sales values   
   (1, 4536),
   (2, 4674),
   (3, 4536) -- to have multiple sales for Red Bull
   
insert into Products values
   (4536, 'Red bull energy drink 300 ml', 3.68, 2.88),
   (4674, 'Mac coffee 25 gr', 2.59, 2.10)
   
select 
   p.product_name, sum(p.price - p.real_price) benefit
from Sales s join Products p on s.product_code = p.product_code
group by p.product_name

product_name	benefit
Mac coffee 25 gr	0.4900
Red bull energy drink 300 ml	1.6000

如何计算 SQL 服务器中某些特定产品类型的收益？

How to calculate benefit of some specific product type in SQL Server?

sql

sql-server