SQL query || 1

Question

Student (Sid,gender,marks,branch)

Query: Retrieve Sid's who scored the highest mark?

SELECT SID 
FROM Student

EXCEPT

SELECT T1.Sid
FROM Student T1,Student T2
WHERE T1.marks < T2.marks

What are other possible correct variation equal to this query in SQL ? 

Answer 1

Select sid ,max(marks)

from student

GROUP BY sid

Answer 2

SELECT sid

FROM Student

WHERE Marks IN (SELECT  MAX(Marks)

                            FROM Student);