如何在其中一列具有相同值的行中查询列值最高的行

在SQL Server 2000上工作的另一个解决方案(与上面的内部联接相同,但速度稍快)是:

SELECT id, userId, Score
  FROM UserScores
 WHERE id in (SELECT MAX(id)
                FROM UserScores
               GROUP BY userId
             ) 
 ORDER BY userId

用途:

WITH summary AS (
    SELECT t.id,
                t.userid,
                t.score,
                ROW_NUMBER() OVER (PARTITION BY t.userid ORDER BY t.id DESC, t.score DESC) AS rank
        FROM USERSCORES sc)
SELECT s.id, 
            s.userid,
            s.score
    FROM summary s
 WHERE s.rank = 1

怎么样

SELECT MAX(Id), userId, Score
FROM table
GROUP BY UserId

SELECT U2.id, U2.userId, U2.score
FROM UserScores U2
INNER JOIN (
  SELECT U1.userId, MAX(U1.Id) MaxId
  FROM UserScores U1
  GROUP BY U1.userId
) U3
ON U2.id = U3.MaxId and U2.userId = U3.userId
ORDER BY U2.userId