511. Game Play Analysis I
-- https://leetcode.com/problems/game-play-analysis-i/description/
select player_id, min(event_date) as first_login
from activity
group by player_id
looooggi
-- https://leetcode.com/problems/game-play-analysis-i/description/
select player_id, min(event_date) as first_login
from activity
group by player_id