力扣 550.游戏玩法分析5

数据准备

drop table Activity;

Create table If Not Exists Activity (player_id int, device_id int, event_date date, games_played int);
Truncate table Activity;
insert into Activity (player_id, device_id, event_date, games_played) values ('1', '2', '2016-03-01', '5');
insert into Activity (player_id, device_id, event_date, games_played) values ('1', '2', '2016-03-02', '6');
insert into Activity (player_id, device_id, event_date, games_played) values ('2', '3', '2017-06-25', '1');
insert into Activity (player_id, device_id, event_date, games_played) values ('3', '1', '2016-03-02', '0');
insert into Activity (player_id, device_id, event_date, games_played) values ('3', '4', '2018-07-03', '5');

输入

输出

with t1 as (
   select *,
       lag(event_date,1) over (partition by player_id) rn1
    from Activity
),t2 as (
    select distinct player_id
    from Activity
    group by player_id
),t3 as (
    select count(player_id) as sum_total
    from t2
),t4 as (
    select player_id,
           datediff(event_date,rn1) rn2
    from t1
    where datediff(event_date,rn1)=1
    group by player_id, datediff(event_date,rn1)
)
select round(t4.rn2 / t3.sum_total, 2) fraction
from t4,t3
where 1=1
;