题解 | #某宝店铺折扣率#
某宝店铺折扣率
https://www.nowcoder.com/practice/3a56f160308441f5a79d8ac8d953e5e7
select round(sum(sales_price)/sum(tag_price*sales_num)*100,2) "discount_rate(%)" from product_tb left join sales_tb using(item_id)
折扣率=GMV/(吊牌金额*销售量)=SUM(sales_price)/SUM(sales_num*tag_price)