✅EASY AND SIMPLE SOLUTION✅
\n\n# Code\n\n# Write your MySQL query statement below\nselect \n    round(sum(temp)/count(distinct player_id), 2) as fraction\nfrom \n(\n  select\n    player_i
\n\n# Code\n```\n# Write your MySQL query statement below\nselect \n    round(sum(temp)/count(distinct player_id), 2) as fraction\nfrom \n(\n  select\n    player_id,\n    datediff(event_date, min(event_date) over(partition by player_id)) = 1 as temp\n  from \n    Activity\n) as t\n```
['MySQL']