题解 | #从 Products 表中检索所有的产品
从 Products 表中检索所有的产品名称以及对应的销售总数
https://www.nowcoder.com/practice/2b289b78de1546f38fd24e17e56f1bec
select
p.prod_name,
o.quantity
from
Products p
left join (
select prod_id,sum(quantity) quantity from OrderItems group by prod_id
) o on p.prod_id = o.prod_id
