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For Heighest marks:-
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Select
* from Student s where 0=(Select count(*) from Student s1 where s1.marks > s.marks)For Second Heighest change the Condition like ' where 1=....'
Similarly For 3rd, 4th ...... and n'th hight, change the condition like
'where 2=...., 3=... .......... and (n-1)=.........'
Hope this will help u....
Thanks.....