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Re: Returning a set of dates - Mailing list pgsql-sql

From Samuel Gendler
Subject Re: Returning a set of dates
Date
Msg-id BANLkTik2c8U=DyFAkDDFDNaiagcrspYrdQ@mail.gmail.com
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In response to Returning a set of dates  ("C. Bensend" <benny@bennyvision.com>)
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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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