Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people, just like you, are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
Solved

Oracle SQL Transpose Multiple Record

Posted on 2006-06-13
4
1,259 Views
Last Modified: 2010-05-18
Hoping this is relatively simple, but my SQL is not up to it.

We have a peice of SQL that returns up to 2 of the latest address records for students.

e.g. SELECT * FROM (SELECT stud_id, surname, forename, dob, address1, address2, address3,
      ROW_NUMBER() OVER (PARTITION  BY stud_id ORDER BY address.start_date DESC) row_num

       FROM student, addresses
      WHERE student.stud_id = addresses.entity_id(+))
      WHERE row_num <3

If a student has 2 or more addresses then 2 records are returned for that student.

I need to return a single record per student with both addresses shown (as seperate fields) within that record

e.g. stud_id, surname, forename, dob, address1, address2, address3, address1-2, address2-2, address3-2

Any ideas would be much appreciated (Oracle ver is 9.02 if that helps). Would prefer a pure SQL solution if possible.

Thanks

Andy
0
Comment
Question by:phatmankerr
  • 2
  • 2
4 Comments
 
LVL 14

Accepted Solution

by:
GGuzdziol earned 500 total points
ID: 16892974
SELECT stud_id, MAX(surname), MAX(forename), MAX(dob),
    MAX(DECODE(row_num, 1, address1, NULL)),
    MAX(DECODE(row_num, 1, address2, NULL)),
    MAX(DECODE(row_num, 1, address3, NULL)),
    MAX(DECODE(row_num, 2, address1, NULL)),
    MAX(DECODE(row_num, 2, address2, NULL)),
    MAX(DECODE(row_num, 2, address3, NULL))
  FROM (
    SELECT stud_id, surname, forename, dob, address1, address2, address3,
        ROW_NUMBER() OVER (PARTITION  BY stud_id ORDER BY address.start_date DESC) row_num
      FROM student, addresses
      WHERE student.stud_id = addresses.entity_id(+)
  )
  WHERE row_num <3
  GROUP BY stud_id
0
 

Author Comment

by:phatmankerr
ID: 16897603
Thanks mate,

That appears to work, is there anyway to make it more efficient, it is returning upwards of 70,000 rows and runs fairly slowly.

Don't worry if not, will assign you the points anyway as it works fine.

Cheers

Andy
0
 
LVL 14

Expert Comment

by:GGuzdziol
ID: 16900685
You mean there is big overhead in part I added? i.e. how long does it take to run only inner query and how long all of this?
0
 

Author Comment

by:phatmankerr
ID: 16900837
Apologies - a before and after comparison indicates that your additional code has very little impact - we appear to have some server performance issues.

Thanks for your help.
0

Featured Post

PRTG Network Monitor: Intuitive Network Monitoring

Network Monitoring is essential to ensure that computer systems and network devices are running. Use PRTG to monitor LANs, servers, websites, applications and devices, bandwidth, virtual environments, remote systems, IoT, and many more. PRTG is easy to set up & use.

Question has a verified solution.

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

Suggested Solutions

Title # Comments Views Activity
selective queries 7 37
ODBC in excel 2016 in Windows 10 via VBA 16 137
Oracle collections 15 27
Oracle 12c Default Isolation Level 17 41
How to Unravel a Tricky Query Introduction If you browse through the Oracle zones or any of the other database-related zones you'll come across some complicated solutions and sometimes you'll just have to wonder how anyone came up with them.  …
From implementing a password expiration date, to datatype conversions and file export options, these are some useful settings I've found in Jasper Server.
This video shows how to set up a shell script to accept a positional parameter when called, pass that to a SQL script, accept the output from the statement back and then manipulate it in the Shell.
This video shows how to Export data from an Oracle database using the Datapump Export Utility.  The corresponding Datapump Import utility is also discussed and demonstrated.

856 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