题解 | 返回产品名称和每一项产品的总订单数
返回产品名称和每一项产品的总订单数
https://www.nowcoder.com/practice/1c64fd9048364a58a8ffa541720359a4
select prod_name, count(order_num) as orders from Products P left join OrderItems O using(prod_id) group by prod_name order by prod_name ASC;