题解 | 检索每个顾客的名称和所有的订单号（二）

# select cust_name, order_num
# from Customers C left join Orders O on C.cust_id = O.cust_id
# order by 
#     cust_name ASC;


select cust_name, order_num
from Customers C left join Orders O  using(cust_id)
order by 
    cust_name ASC;