1.相关数据表

Score表

[User]表

SQL语句例如以下：

--查询出各科成绩最好的学生信息

--自连接

--SELECT TOP 1 * FROM Score B WHERE B.ScoreName = '数学' ORDER BY B.Score DESC

SELECT A.ID,U.Name,A.ScoreName,A.Score

FROM Score A,[User]U

WHERE UID IN (SELECT TOP 1 UID

                       FROM Score B

                      WHERE B.ScoreName = A.ScoreName

                      ORDER BY B.Score DESC) AND A.UID=U.ID

ORDER BY A.ScoreName, A.Score DESC

查询结果例如以下图：

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