SQL查询最畅销的产品

Question

我正在尝试获取所有产品（限额5），这些产品是过去7天的畅销产品（总销售额）。

我当前的数据库架构基本上是这样的：

- products
 - id
 - name
 - price

- orders
 - id
 - purchased_at

- orders_products
 - id
 - products_id
 - orders_id
 - quantity
 - paid_price

我正在寻找mysql语法。

提前致谢！

Answer 1

这是一个相对简单的INNER JOIN s序列，SUM()的汇总quantity乘以paid_price：

SELECT
  p.name,
  /* aggregate SUM() of orders_products qty * price */
  SUM(op.quantity * op.paid_price) AS total_sale_price
FROM
  products
  /* Join through orders_products (which gives the quantity) */
  INNER JOIN orders_products op ON p.id = op.products_id
  /* ...to orders (which provides the date) */
  INNER JOIN orders o ON op.orders_id = o.id
/* The last week... */
WHERE o.purchased_at >= (CURDATE() - INTERVAL 7 DAY)
GROUP BY p.name
/* In descending order of quantity, only the top 5 */
ORDER BY total_paid_price DESC LIMIT 5

我建议花些时间审核aggregate functions。