Max of sum query

Question

I\'m trying to write a query that will list student(s) enrolled with the maximum total credit points.

Here is my query:

    SELECT s.S_ID,
       s.S_LAS         


        

Answer 1

Removing all the "noise" your query become

SELECT s.S_ID, s.S_LAST, s.S_FIRST, s."Total Credits"
FROM
  (SELECT ...
   FROM (...) q1
   JOIN (...) q2
  ) q3
GROUP BY s.S_ID, s.S_LAST, s.S_FIRST, s."Total Credits"
WHERE "Total Credits" = max("Total Credits");

It's easy to see that s is not visible from your main query, also in the WHERE condition you're confronting a detail with an aggregation, that's not possible (at least not that way)