On 09/08/2010 08:24 AM, Tim Schumacher wrote:
>>> I'm kinda stuck situation, I have a timestamp which resambles a
>>> startdate and a duration in days and I want to bloat this, so I have a
>>> row for every day beginning from the startdate. I have created an
>>> example bellow, maybe I'm doing it on the wrong angle and you can come
>>> up with some better ideas:
<snip>
> As you can see in my example, I'm already using it and this is my
> dilemma. Since I can not bring the values of the FROM-Table to the
> parameters of my function.
Depending on how large your base table is, this might work for you:
CREATE TABLE example
( id serial NOT NULL, startdate timestamp without time zone, duration int NOT NULL, CONSTRAINT pq_example_id PRIMARY
KEY(id)
);
insert into example(id,startdate,duration) values (1,'2010-09-03',4);
insert into example(id,startdate,duration) values (2,'2010-09-03',6);
CREATE OR REPLACE FUNCTION unroll_durations()
RETURNS TABLE( example_id integer, duration_date date)
AS $$
DECLARE rec1 record; rec2 record;
BEGIN FOR rec1 IN SELECT id, startdate, duration FROM example LOOP FOR rec2 IN SELECT
to_date(to_char(rec1.startdate,'YYYY-MM-DD'),'YYYY-MM-DD') + s.a as
stockdate FROM generate_series(0, rec1.duration - 1) AS s(a) LOOP example_id := rec1.id;
duration_date:= rec2.stockdate; RETURN NEXT; END LOOP; END LOOP;
END;
$$ LANGUAGE plpgsql;
select * from unroll_durations();example_id | duration_date
------------+--------------- 1 | 2010-09-03 1 | 2010-09-04 1 | 2010-09-05 1 |
2010-09-06 2 | 2010-09-03 2 | 2010-09-04 2 | 2010-09-05 2 | 2010-09-06 2 |
2010-09-07 2 | 2010-09-08
(10 rows)
HTH,
Joe
--
Joe Conway
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