1.相关数据表
Score表 
[User]表 
SQL语句如下：
复制代码 代码如下:
–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
查询结果如下图： 
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