mysql - SQL从数据库中选择具有最大值的行并按2列分组

Question

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Answer 1

您的预期结果并未在GROUP BY 子句中建议team_id，它实际上是基于player_id。因此，将其从 GROUP BY 子句中删除并将 ON 子句更改为 t1.player_id = t2.player_id and t1.valore = t2.valore

因此，您的查询将是:

create view...
    select t1.*  
    from offers t1 inner join 
        (select player_id, max(valore) as valore
         from offers
         group by player_id
        ) t2 
       on t1.player_id = t2.player_id and
          t1.valore = t2.valore;

但是，我会这样做:

create view v1 as
    select o.*
    from offers o
    where valore = (select max(o1.valore)
                    from offer o1
                    where o1.player_id = o.player_id
                   );