比较同一表中的记录

Question

I have Student_Table with following structure.

 Student_Note  Table 
  student_id  seq_num  note 
  11212         1       firstnote
  11212         2       secondNote 
  11212         3       thirdNote
  21232         1       secondstudentnote1
  21232         2       secondstudentnote2

so on

I want to get latest note (which has largest seq_num) for a particilar student.

I have tried following query

  select tn.note from Student_Note tn   JOIN Student_Note tn1
            ON (tn.student_id =tn1.student_id AND  tn.seq_num < tn1.seq_num)
             where tn.student_id=11212

it is giving more than one row. How to achieve aforementioned scenario ?

I forgot mention that I am using above query as subquery . As per sybase TOP clause will not work in subquery.

PS I am using sybase.

Answer 1

OK - changed as apparently cannot use TOP.........

select tn.note from Student_Note tn   
where tn.student_id=11212
and tn.seq_num = (SELECT MAX(seq_num) from Student_Note WHERE Student_Note.Student_Id = tn.Student_Id)

Answer 2

Please try this

select      substring(max(str(seq_num,10,'0') + note),11,len(note))
from        Student_Note 
where       student_id=11212