Question

所以我有一个SQL语句，它返回如下内容：

PLAYER_ID | PLAYER_NAME | POSITION | 
1           player1       hitter
1           player1       short stop
1           player1       pitcher
2           player2       pitcher
2           player2       catcher

这是通过玩家和current_player_stats之间的内部联接来完成的。

SELECT P.PLAYER_ID, P.PLAYER_NAME, S.POSITION
FROM PLAYERS AS P
INNER JOIN CURRENT_PLAYER_STATS AS S
ON P.PLAYER_ID = S.PLAYER_ID
WHERE P.PLAYER_ID = <some player id>

我可以用什么SQL来过滤这个结果集给我：

PLAYER_ID | PLAYER_NAME | POSITION | 
1           player1       hitter
2           player2       pitcher

即。每个球员的最上一行。

Answer 1

如果提供的信息有限，请尝试

;WITH Vals AS (
    SELECT    Player_ID, 
              Player_Name, 
              Position, 
              ROW_NUMBER() OVER(PARTITION BY Player_ID ORDER BY [Columns Here]) as RowID
    FROM YourTable
)
SELECT *
FROM Vals 
WHERE RowID = 1

选择联接的第一个匹配项

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