题解 | 返回产品名称和与之相关的订单号
select p.prod_name, o.order_num from Products p left join OrderItems o on p.prod_id=o.prod_id order by p.prod_name
select p.prod_name, o.order_num from Products p left join OrderItems o on p.prod_id=o.prod_id order by p.prod_name
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