Re: Returning a set of dates
| От | Samuel Gendler |
|---|---|
| Тема | Re: Returning a set of dates |
| Дата | |
| Msg-id | BANLkTik2c8U=DyFAkDDFDNaiagcrspYrdQ@mail.gmail.com обсуждение исходный текст |
| Ответ на | Returning a set of dates ("C. Bensend" <benny@bennyvision.com>) |
| Список | pgsql-sql |
On Fri, Jun 10, 2011 at 9:28 PM, C. Bensend <benny@bennyvision.com> wrote:
SELECT next_bill_date( '2011-01-01', '1 month', '4 months' );
.. I expect the following result set:
next_bill_date
----------------
2011-07-01
2011-08-01
2011-09-01
2011-10-01
CREATE OR REPLACE FUNCTION public.next_bill_date(d date, period interval,
i interval)
RETURNS SETOF date
AS $function$
DECLARE
max_date date;
due_date date;
BEGIN
max_date := CURRENT_DATE + i;
due_date := d;
WHILE due_date + period <= max_date LOOP
RETURN NEXT due_date; -- add d to the result set
due_date := due_date + period;
END LOOP;
RETURN; -- exit function
END;
$function$ language plpgsql;
testdb=# select next_bill_date('2011-06-11', '2 week', '3 month'); next_bill_date
----------------
2011-06-11
2011-06-25
2011-07-09
2011-07-23
2011-08-06
2011-08-20
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