Improve company productivity with a Business Account.Sign Up

x
  • Status: Solved
  • Priority: Medium
  • Security: Public
  • Views: 34
  • Last Modified:

ordering the output of rows - oracle query

Id like to order the output of the first_result, second_result, and third_result rows so they are written in order from the highest value to the lowest value.  For example, if the values in the first row are 18, 20, 1, 21, 17, 1 then they should be listed in the row as 21, 20, 18, 17, 1, 1
Is this possible?  If so how
Thank so much!!


SELECT grade_level,
         MAX(CASE WHEN rn = 1 THEN cnt END) first_result,
         MAX(CASE WHEN rn = 2 THEN cnt END) second_result,
         MAX(CASE WHEN rn = 3 THEN cnt END) third_result,
         SUM(cnt)                         total_enrolled
    FROM (SELECT q.*, ROW_NUMBER() OVER(PARTITION BY grade_level ORDER BY home_room) rn
            FROM (  SELECT grade_level, home_room, COUNT(*) cnt
                      FROM students
                     WHERE enroll_status = 0 AND schoolid IN (3)
                  GROUP BY home_room, grade_level) q)
GROUP BY grade_level
ORDER BY grade_level;

Open in new window

0
Basssque
Asked:
Basssque
  • 3
  • 2
2 Solutions
 
slightwv (䄆 Netminder) Commented:
Try changing:
ROW_NUMBER() OVER(PARTITION BY grade_level ORDER BY home_room) rn

to:
ROW_NUMBER() OVER(PARTITION BY grade_level ORDER BY home_room, cnt desc) rn
0
 
ste5anSenior DeveloperCommented:
Why do you order by home_room?  Shouldn't it be

SELECT  grade_level ,
        MAX(CASE WHEN rn = 1 THEN cnt
            END) first_result ,
        MAX(CASE WHEN rn = 2 THEN cnt
            END) second_result ,
        MAX(CASE WHEN rn = 3 THEN cnt
            END) third_result ,
        SUM(cnt) total_enrolled
FROM    ( SELECT    q.* ,
                    ROW_NUMBER() OVER ( PARTITION BY grade_level, home_room ORDER BY cnt DESC ) rn
          FROM      ( SELECT    grade_level ,
                                home_room ,
                                COUNT(*) cnt
                      FROM      students
                      WHERE     enroll_status = 0
                                AND schoolid IN ( 3 )
                      GROUP BY  home_room ,
                                grade_level
                    ) q
        )
GROUP BY grade_level
ORDER BY grade_level;

Open in new window

0
 
BasssqueAuthor Commented:
slightvw
the change doesn't have any impact on the order or the values in the rows

ste5an
your change now only outputs the first_result column and all others are null
0
Get expert help—faster!

Need expert help—fast? Use the Help Bell for personalized assistance getting answers to your important questions.

 
slightwv (䄆 Netminder) Commented:
Sorry but I don't know your data.  If you understand what the ROW_NUMBER function is doing, you should be able to change the order yourself.

Maybe move the count before home room or remove home room all together?

ROW_NUMBER() OVER(PARTITION BY grade_level ORDER BY cnt desc) rn

Only you understand your data.  Unless you can post some sample data and expected results, we can only guess.
0
 
BasssqueAuthor Commented:
Figured it out, thanks!
ROW_NUMBER() OVER(PARTITION BY grade_level ORDER BY cnt DESC, home_room) rn
0
 
BasssqueAuthor Commented:
figured it out based on guidance in assisted solution
0
Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.

Join & Write a Comment

Featured Post

Free Tool: Subnet Calculator

The subnet calculator helps you design networks by taking an IP address and network mask and returning information such as network, broadcast address, and host range.

One of a set of tools we're offering as a way of saying thank you for being a part of the community.

  • 3
  • 2
Tackle projects and never again get stuck behind a technical roadblock.
Join Now