mysql - SQL 查询 - 将行与选定的列合并 [MySQL]

Question

我有下表:

Game | Name | Result | Stage
  1      A       W      F
  1      B       L      0
  2      C       L      F
  2      D       W      0
  3      E       L      0
  3      F       W      0

The output I am looking for:

Game | Name | Result | Stage
  1      A       W      F
  2      D       W      F

I only want to see the winners (W) from the results of stage F.

I can do this via joins (which isn't very fast):

SELECT *
FROM (
    SELECT *
    FROM MyTable
    WHERE Stage = 'F'
  ) AA
  JOIN MyTable
    ON AA.Game = MyTable.Game AND AA.Result <> MyTable.Result

..但我想知道是否有更简单、更有效的方法来做到这一点。另外，这需要我之后再做一些过滤。

提前致谢!

Answer 1

要在没有自连接或等价物的情况下执行此类作业，您可能需要使用 MySQL 不支持的 SQL 窗口函数。您使用的联接还不错，但这会更简单一些:

SELECT
  players.Game AS Game,
  players.Name AS Name,
  'W' AS Result,
  'F' as Stage
FROM
  MyTable stage
  JOIN MyTable players
    ON stage.Game = players.Game
WHERE
  stage.stage = 'F'
  AND players.result = 'W'