update of the end date on the dates that overlap
HelloI 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.
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