Question

Student    Subj   Period  Score
-------------------------
A          Math   100        50
A          Hist   100        100
A          Sci    200        70
B          Math   100        50
B          Hist   100        50

I’m trying to query for the highest score for an each student.

If scores are all same (such as ‘B’ then pick one on the bottom. If that’s not possible, just pick anything.

I’m having a hard time using max() and min() and group by to get a correct result.
Result should look like this

Student    Subj   Period    Score
-------------------------
A          Hist   100       100
B          Hist   100       50

Answer 1

You want to use analytic functions (I assume this is in Oracle from the mention of pl/sql):

select Student, Subj, Period, Score
from (select t.*,
             row_number() over (partition by student order by score desc) as seqnum
      from t
     ) t
where seqnum = 1