题解 | #某宝店铺连续2天及以上购物的用户及其对应的天数#

with t as
(
select distinct user_id, sales_date
from sales_tb
)

select t1.user_id,count(*)+1
from t t1 left join t t2 on t1.user_id=t2.user_id and datediff(date(t2.sales_date),date(t1.sales_date))=1
where t2.user_id is not null
group by t1.user_id
order by t1.user_id