连续活跃登陆的用户指至少连续2天都活跃登录的用户
解决类似场景的问题
创建数据
CREATE TABLE test5active(
dt string,
user_id string,
age int)
ROW format delimited fields terminated BY ',';
INSERT INTO TABLE test5active VALUES
('2019-02-11','user_1',23),('2019-02-11','user_2',19),
('2019-02-11','user_3',39),('2019-02-11','user_1',23),
('2019-02-11','user_3',39),('2019-02-11','user_1',23),
('2019-02-12','user_2',19),('2019-02-13','user_1',23),
('2019-02-15','user_2',19),('2019-02-16','user_2',19);思路一:
1、因为每天用户登录次数可能不止一次，所以需要先将用户每天的登录日期去重。
2、再用row_number() over(partition by _ order by _)函数将用户id分组，按照登陆时间进行排序。
3、计算登录日期减去第二步骤得到的结果值，用户连续登陆情况下，每次相减的结果都相同。
4、按照id和日期分组并求和，筛选大于等于2的即为连续活跃登陆的用户。
第一步：用户登录日期去重
select DISTINCT dt,user_id from test5active;
第二步：用row_number() over()函数计数
select
t1.user_id,t1.dt,
row_number() over(partition by t1.user_id order by t1.dt) day_rank
from
(
select DISTINCT dt,user_id from test5active
)t1;
第三步：日期减去计数值得到结果
select
t2.user_id,t2.dt,date_sub(t2.dt,t2.day_rank) as dis
from
(
select
t1.user_id,t1.dt,
row_number() over(partition by t1.user_id order by t1.dt) day_rank
from
(
select DISTINCT dt,user_id from test5active
)t1)t2;
第四步：根据id和结果分组并计算总和，大于等于2的即为连续登陆的用户，得到 用户id，开始日期，结束日期，连续登录天数
select
t3.user_id,min(t3.dt),max(t3.dt),count(1)
from
(
select
t2.user_id,t2.dt,date_sub(t2.dt,t2.day_rank) as dis
from
(
select
t1.user_id,t1.dt,
row_number() over(partition by t1.user_id order by t1.dt) day_rank
from
(
select DISTINCT dt,user_id from test5active
)t1
)t2
)t3 group by t3.user_id,t3.dis having count(1)>1;用户id 开始日期 结束日期 连续登录天数
最后：连续登陆的用户
select distinct t4.user_id
from
(
select
t3.user_id,min(t3.dt),max(t3.dt),count(1)
from
(
select
t2.user_id,t2.dt,date_sub(t2.dt,t2.day_rank) as dis
from
(
select
t1.user_id,t1.dt,
row_number() over(partition by t1.user_id order by t1.dt) day_rank
from
(
select DISTINCT dt,user_id from test5active
)t1
)t2
)t3 group by t3.user_id,t3.dis having count(1)>1
)t4;
思路二：使用lag(向后)或者lead(向前)
select
user_id,t1.dt,
lead(t1.dt) over(partition by user_id order by t1.dt) as last_date_id
from
(
select DISTINCT dt,user_id from test5active
)t1;
select
distinct t2.user_id
from
(
select
user_id,t1.dt,
lead(t1.dt) over(partition by user_id order by t1.dt) as last_date_id
from
(
select DISTINCT dt,user_id from test5active
)t1
)t2 where datediff(last_date_id,t2.dt)=1;
参考：
2020年大厂面试题-数据仓库篇
SQL 查询连续登陆7天以上的用户
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