Go Premium for a chance to win a PS4. Enter to Win

x
?
Solved

WHERE = (value in from a subselect).......         (This SQL works, just want your opinion on it ) Part 2

Posted on 2010-11-30
5
Medium Priority
?
547 Views
Last Modified: 2012-08-30
Hi EE,

In a related question, and EE expert taught me how to improve my sql when testing a WHERE to a subselect.

I am in a similar situation,however:
    in the prev post, i wanted the max for a student's id

It's possible for a student to complete multiple degrees, for ex:
    MED         MD  DEGREE   05-31-13
    PH           PHD DEGREE   12-31-12

Both degrees can have diff. graduation dates. The vendor's pgm allows the user to go in an even generate multiple
degree rows (don't know why that would happen) and assigns a seq # like this:

    MED             MD  DEGREE   05-31-13     1
    PH               PHD DEGREE   12-31-12     1
    PH               PHD DEGREE   12-31-12     2

so i want the graduation date for the max seq no like this

    MED             MD  DEGREE   05-31-13     1
     PH               PHD DEGREE   12-31-12     2

So i figured, would have to group by student_id, College, Degree

and then i correlated like this:
                            WHERE b.person_uid = a.person_uid
                         and
                b.college = a.college
                         and
                b.program = a.program        


I'd like to double check with you that coding the above WHERE in the sub select was the right approach.
I think so, bec. got desired results...

Below are screen shots:
    a) detail rows for a student (student id is not shown as one of the columns)
    b) results of the sql that appears in the code window below...


tx for your help, sandra

                   

SELECT   a.person_uid
        ,a.college
        ,a.program
        ,a.curriculum_order
        ,a.outcome_graduation_date
FROM academic_outcome a
WHERE a.person_uid = 18429
            AND     
      a.curriculum_order =   
         (
          select max(curriculum_order)
          from academic_outcome b
          WHERE b.person_uid = a.person_uid
                         and
                b.college = a.college
                         and
                b.program = a.program         
          group by person_uid, college, program
         )

Open in new window

2010-11-30a-adg-dtl.GIF
2010-11-30b-adg-dtl.GIF
0
Comment
Question by:mytfein
5 Comments
 
LVL 143

Accepted Solution

by:
Guy Hengel [angelIII / a3] earned 2000 total points
ID: 34241095
yes, that is just fine, IMHO
with the indexes you seem to have, a nice explain plan should also ensure good execution
0
 

Author Comment

by:mytfein
ID: 34241120
Thx Angel,

tx for writing and your validation, s
0
 
LVL 14

Expert Comment

by:Muhammad Ahmad Imran
ID: 34241122
does not seems any problem
0
 
LVL 20

Expert Comment

by:gatorvip
ID: 34241144
   PH               PHD DEGREE   12-31-12     1
    PH               PHD DEGREE   12-31-12     2

How are these two ordered - what decides whether it's a "1" or a "2"?

You could accomplish what you want with analytics. Something like the code below should work:


SELECT   person_uid
        ,college
        ,program
        ,curriculum_order
        ,outcome_graduation_date
from        
(
	SELECT   a.person_uid
		,a.college
		,a.program
		,a.curriculum_order
		,a.outcome_graduation_date
		,row_number() over(partition by person_uid, college, program order by curriculum_order desc) rn
	FROM academic_outcome a
	WHERE a.person_uid = 18429
)
where rn=1

Open in new window

0
 

Author Comment

by:mytfein
ID: 34241271
Hi Leo and Gator,

tx for writing,  sorry that i closed the question as done while you were replying....

Hi Gator,
    i understand your suggestion as another approach.... i could sort by approp column so that
    the correct row gets tagged with row#1 for rn=1

tx again everyone, s

0

Featured Post

Concerto Cloud for Software Providers & ISVs

Can Concerto Cloud Services help you focus on evolving your application offerings, while delivering the best cloud experience to your customers? From DevOps to revenue models and customer support, the answer is yes!

Learn how Concerto can help you.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Configuring and using Oracle Database Gateway for ODBC Introduction First, a brief summary of what a Database Gateway is.  A Gateway is a set of driver agents and configurations that allow an Oracle database to communicate with other platforms…
Using SQL Scripts we can save all the SQL queries as files that we use very frequently on our database later point of time. This is one of the feature present under SQL Workshop in Oracle Application Express.
Video by: Steve
Using examples as well as descriptions, step through each of the common simple join types, explaining differences in syntax, differences in expected outputs and showing how the queries run along with the actual outputs based upon a simple set of dem…
This video explains what a user managed backup is and shows how to take one, providing a couple of simple example scripts.

824 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question