2023-10-12 23:46 上海开放大学 Java
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mysql
select player_id,min(event_date) as first_login
from Activity
group by player_id
select player_id,event_date as first_login
from Activity
group by player_id
having event_date = min(event_date)
为什么下面这种方式是错的，
from Activity
group by player_id
select player_id,event_date as first_login
from Activity
group by player_id
having event_date = min(event_date)
为什么下面这种方式是错的，
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