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 A as(
select
user_id,
sales_date,
row_number() over(partition by user_id order by sales_date) 'rn'#A①排序
from
sales_tb)
 
select
user_id,
count(*) days_count
from A
group by  #B.如何把连续的时间抽出来
user_id,
date_add(sales_date,INTERVAL -rn day) #A②作差
having count(*)>=2 #C.如何限制连续的时间是多久