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02.03.2005 at 02:47AM PST, ID: 21299982
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7.0

Merging records

Asked by morphman in Oracle Database

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A slightly different question here.

I have the following data structure.

NINO       START_DATE  END_DATE
---------- ----------- -----------
AA000001   01-jan-2000 25-feb-2000
AA000001   26-feb-2000 13-mar-2000
AA000001   14-mar-2000 20-apr-2000
AA000001   10-may-2001 11-may-2001
AA000001   15-may-2001 25-may-2001
AA000001   26-may-2001 25-jun-2001
AA000002   26-feb-2000 13-mar-2000
AA000002   20-jun-2003
AA000003   10-jan-2000 13-jan-2001
AA000003   14-jan-2001 20-jul-2004

I need to merge records where there is a continuation between the 2 records. ie the results here would be :-

AA000001   01-jan-2000 20-Apr-2000
AA000001   10-may-2001 11-may-2001
AA000001   15-may-2001 25-jun-2001
AA000002   26-feb-2000 13-mar-2000
AA000002   20-jun-2003
AA000003   10-jan-2000 20-jul-2004

I can easily do this by creating new records and using a plsql program, however, I need to update the original records. ie, I need to update the latest record with the earlier start date, and then delete (or at least mark for deletion), the non used records.

I have been at my wits end trying to find a good performant solution to do this, but alas, I need some divine inspiration.Start Free Trial
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About this solution

Zone: Oracle Database
Tags: merge, records
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Solution Provided By: riazpk
Participating Experts: 3
Solution Grade: B
 
 
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