Carl_ZhangJH

摘要： 游戏玩法分析 select round(avg(a.event_date is not null), 2) as fraction from (select player_id, min(event_date) as event_date from activity group by player_ 阅读全文

摘要： 游戏玩法分析 select player_id , min(event_date) as first_login from Activity group by player_id order by player_id asc == 阅读全文