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
http://www.nowcoder.com/practice/1c64fd9048364a58a8ffa541720359a4
SELECT p.prod_name prod_name, COUNT(oi.order_num) orders FROM Products p LEFT JOIN OrderItems oi ON p.prod_id = oi.prod_id GROUP BY p.prod_name ORDER BY p.prod_name;