为多个列选择最大值？

Question

假设我有如下表

Students (StudentID, StudentName) 
StudentMarks (StudentID, Mark) 

我需要选择具有最高分的学生..如果有一个以上的学生有相同的标记（和它的最高分）。根据然后选择命名（字母）

我该怎么做？在此先感谢

Answer 1

SELECT s.StudentName, sm.Mark 
FROM Students s 
INNER JOIN StudentMarks sm ON sm.StudentID = s.StudentID 
WHERE sm.Mark = (SELECT MAX(Mark) FROM StudentMarks) 
ORDER BY s.StudentName 

Answer 2

我已经怎么样

select * 
from students s 
inner join studentmarks m on m.studentid = s.studentid 
where m.mark = (select Max(mark) from studentmarks) 
order by s.StudentName 

Answer 3

没有测试过这一点，但它听起来正确

SELECT StudentID, StudentName 
FROM Students 
JOIN StudentMarks USING (StudentID) 
WHERE Mark = 
    (SELECT MAX(Mark) FROM StudentMarks) 
ORDER BY StudentName 

Answer 4

其他选项

SELECT * FROM Students where StudentId in (SELECT StudentID FROM Mark Where Mark = Max(Max)); 

或

个

SELECT s.* FROM Students where exists (SELECT StudentID FROM Mark m Where Mark = Max(Max) and m.StudentId = s.StudentId); 

Answer 5

如果您的RDBMS支持解析函数

WITH Ranked AS 
(
SELECT RANK() OVER(ORDER BY Mark DESC) AS Rnk, 
Students.StudentID, 
Students.StudentName, 
Mark 
FROM Students 
JOIN StudentMarks ON Students.StudentID = StudentMarks.StudentID 
) 
SELECT StudentID, 
     StudentName, 
     Mark 
FROM Ranked 
WHERE Rnk=1 
ORDER BY StudentName 

或为规范的其他解释...

WITH RowNumbered AS 
(
SELECT ROW_NUMBER() OVER(ORDER BY Mark DESC, StudentName ASC) AS Num, 
Students.StudentID, 
Students.StudentName, 
Mark 
FROM Students 
JOIN StudentMarks ON Students.StudentID = StudentMarks.StudentID 
) 
SELECT StudentID, 
     StudentName, 
     Mark 
FROM RowNumbered 
WHERE Num=1 

Answer 6

这只是需要一个简单的加入，并选择第一条记录.. （，根据规格进行预订）

SELECT TOP 1 
    S.StudentName, SM.Mark 
FROM 
    Students S 
    INNER JOIN StudentMarks SM ON SM.studentID = S.StudentID 
ORDER BY 
    SM.Mark DESC, 
    S.StudentName ASC 

Answer 7

......怎么

SELECT * 
    FROM Students 
    WHERE StudentID IN (SELECT StudentID 
          FROM StudentMarks 
          WHERE Mark = (SELECT MAX(Mark) 
               FROM StudentMarks)) 
    ORDER BY StudentName 
    LIMIT 1; 

（上VASH的回答扩展到从中取出非标准功能）。