--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