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You are given a gameplay table named Activity.
Each row captures one player's activity on a calendar date:
The pair (player_id, event_date) is unique.
Define a retained player as a player who has at least one record on the day immediately after their first-ever login date.
Compute the retention fraction:
retained_players / total_distinct_players
Return a single-row result with one column:
The value must be rounded to 2 decimal places.
This problem supports both:
Activity:
| player_id | device_id | event_date | games_played |
|-----------|-----------|-------------|--------------|
| 1 | 2 | 2016-03-01 | 5 |
| 1 | 2 | 2016-03-02 | 6 |
| 2 | 3 | 2017-06-25 | 1 |
| 3 | 1 | 2016-03-02 | 0 |
| 3 | 4 | 2018-07-03 | 5 |[
{"fraction": 0.33}
]Explanation
Only player 1 returns exactly one day after first login. So fraction = 1/3 = 0.33.
Activity:
| player_id | device_id | event_date | games_played |
|-----------|-----------|-------------|--------------|
| 10 | 5 | 2022-01-01 | 4 |
| 10 | 2 | 2022-01-02 | 1 |
| 11 | 7 | 2022-02-10 | 0 |
| 11 | 9 | 2022-02-11 | 8 |[
{"fraction": 1.0}
]Explanation
Both players return on the day after their first login. Fraction = 2/2 = 1.00.
Activity:
| player_id | device_id | event_date | games_played |
|-----------|-----------|-------------|--------------|
| 7 | 1 | 2023-03-01 | 2 |
| 7 | 3 | 2023-03-04 | 5 |
| 8 | 2 | 2023-08-15 | 0 |[
{"fraction": 0.0}
]Explanation
No player has activity on first_login + 1 day. Fraction = 0/2 = 0.00.
Constraints