update of the end date on the dates that overlap

Hello
I have this situation

Status start_date end_date
OP 1 January 2007 31 - dec - 2099
W1 01-apr-2007 30-sep-2008
October 1, 2008 31 - dec - 2099 W2
W3 1 January 2009 31 - dec - 2010
January 1, 2011 31 - dec - 2099 W4

the December 31, 2099 end_date "is a conventional date and indicating the valid (current) state that should be the last"

I want to update the value of the end date to the same value as the date of the next valid record

result

Status start_date end_date
OP 1 January 2007 31 - mar - 2007
W1 01-apr-2007 30-sep-2008
October 1, 2008 31 - dec - 2008 W2
W3 1 January 2009 31 - dec - 2010
January 1, 2011 31 - dec - 2099 W4

Any help?
Thanks in advance
lukx

Hello

Here's a way to do it:

MERGE INTO     table_x          dst
USING     (
          SELECT     start_date          -- or primary key
          ,     LEAD (start_date) OVER (ORDER BY start_date)
                    - 1     AS end_date
          FROM     table_x
     )               src
ON     (src.start_date     = dst.start_date)     -- or primary key
WHEN MATCHED THEN UPDATE
SET     dst.end_date     = src.end_date
WHERE     src.end_date     IS NOT NULL
AND     end_date     = DATE '2099-12-31'     -- if wanted
;

If you would care to post CREATE TABLE and INSERT statements for your sample data, and then I could test this.

Tags: Database

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