get the maximum number for each group

Hi, I am a newbie and work on a project for school. I worked this problem for a few days and made a bit of progress.
I have two tables, student and register for a database of the College. I need to show students that have the most entries into each large. So far, I have:

WITH COUNT_Q AS
(
SELECT B.SSN, B.MAJOR, COUNT (A.CLASS_NO) AS COUNTCLASS
TO REGISTER A, STUDENT B
WHERE A.SSN = B.SSN
B.SSN GROUP, B.MAJOR
)

SELECT MAX (COUNTCLASS), MAJOR
OF COUNT_Q
GROUP BY MAJOR
;

I get the correct results, but need to introduce the SSN and the Major of the studens. When I add in the SSN and major, as below, I get too many files.
WITH COUNT_Q AS
(
SELECT B.NAME, B.SSN, B.MAJOR, COUNT (A.SSN) AS COUNTCLASS
TO REGISTER A, STUDENT B
WHERE A.SSN = B.SSN
B.NAME, B.SSN, B.MAJOR GROUP
)

SELECT *.
OF COUNT_Q
WHERE (COUNTCLASS) IN (SELECT MAX (COUNTCLASS)
OF COUNT_Q
GROUP BY MAJOR
)
;

Can someone point me in the right direction? 
SELECT  B.NAME,
        B.SSN,
        B.MAJOR
  FROM  (
         SELECT  B.NAME,
                 B.SSN,
                 B.MAJOR,
                 COUNT(A.CLASS_NO) SSN_MAJOR_COUNTCLASS
                 DENSE_RANK() OVER(PARTITION BY MAJOR ORDER BY COUNT(A.CLASS_NO) DESC) RNK
           FROM  ENROLL A,
                 STUDENT B
           WHERE A.SSN = B.SSN
           GROUP BY B.NAME,
                    B.SSN,
                    B.MAJOR
        )
  WHERE RNK = 1
/

SY.

Published by: Solomon Yakobson, March 27, 2011 18:53

Tags: Database

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