题解 | #店铺901国庆期间的7日动销率和滞销率#

#需要用到窗口函数自定义滑窗并需要去重的 不适合使用窗口函数
select distinct dt,round(n/kind_n,3),1-round(n/kind_n,3)
from 
(
select date(event_time) as dt
,(
select count(distinct product_id)
from tb_product_info
left join tb_order_detail   using(product_id)
left join tb_order_overall ooa using(order_id)
where release_time <event_time  and
date(event_time) between date_sub(dt,interval 6 day) and dt and shop_id=901 #主查询套子查询，相当于字段的快慢指针
)as n ,
(
  select count(product_id)
  from tb_product_info
  where shop_id=901 
)kind_n
from tb_order_overall
where date(event_time) between '2021-10-01' and '2021-10-03'
)t