题解 | 每个顾客最近一次下单的订单信息

select order_id,customer_name,order_date from(
select order_id,customer_name,order_date
,rank () over(partition by o.customer_id order by order_date desc) ranking
from orders o
left join customers c
on o.customer_id = c.customer_id)rk
where ranking = 1