题解 | 每个顾客最近一次下单的订单信息

with t1 as(
    select
    order_id,
customer_id,
order_date,
row_number()over(partition by customer_id order by order_date desc) rn
from
orders
)
select
order_id,
customer_name,
order_date
from
t1 inner join customers t2 on t1.customer_id=t2.customer_id
where rn=1