选择每个玩家的总分

Question

假定简单的分数表（player_id，分数）。如何为每个玩家选择得分总和？并将结果olny限制为N个最高和。

player_id|score
---------------
      457|   20
      457|   25
      300|   50
      300|    5
      100|    1

如果N为2，则结果应为

player_id|score
---------------
      300|   55
      457|   45

Answer 1

首先，您需要对结果进行分组，然后按分组结果进行排序，并将结果限制为2条记录（我假设使用players表名）：

select player_id, sum(score) score
from players
group by player_id
order by score desc
limit 2

Demo

Answer 2

SELECT TOP 2 player_id, SUM(score) FROM score GROUP BY player_id

Answer 3

您可以使用sum（）group by和

对于mysql，您可以使用limit

  select player_id, sum(score) score
  from my_table 
  group by player_id 
  order by score desc
  limit 2 

对于SqlServer，您可以使用TOP 2

  select TOP 2 player_id, sum(score) score
  from my_table 
  order by score desc
  group by player_id