如何解决SQL错误：在连接的情况下：“每个派生表都必须有自己的别名”

我正在使用此查询：

select max(counted)
from (select max(outcome.player_of_match) counted 
from outcome 
inner join player
on player.id=outcome.player_of_match group by player.id);

它显示了SQL错误：

每个派生表都必须有自己的别名

---

您只需将别名添加到要从中选择的子查询：

select max(T1.counted)
from   (
          select     max(outcome.player_of_match) counted 
          from       outcome 
          inner join player
                  on player.id=outcome.player_of_match 
          group by   player.id
       ) AS T1;