What I would like to do is also return the date that is assigned to d_date for the current iteration of the first loop. The following code does not work. I either get one of three error messages depending on how many quote marks I use (unterminated string, error with $1, or unexpected return type). And suggestions would be greatly appreciated.
I think you had it working when you got the unexpected return type message, you were just calling it wrong. The data types must match *exactly* including WITH/WITHOUT TIME ZONE. I often find it simpler when working with date/time data types to use an explicit cast, e.g.:
create table load_info_table(delivery_date date, clean_weight float8, dirty_weight float8);
insert into load_info_table values('01/01/2003',8,10);
insert into load_info_table values('01/01/2003',9,11);
insert into load_info_table values('01/01/2003',10,12);
insert into load_info_table values('01/01/2003',7,8);
insert into load_info_table values('01/02/2003',18,20);
insert into load_info_table values('01/02/2003',29,36);
insert into load_info_table values('01/02/2003',9,15);
-- Function: public.get_factory_ytd()
CREATE or replace FUNCTION public.get_factory_ytd() RETURNS setof record AS '
declare
ytd_record record;
d_date record;
begin
for d_date in select distinct delivery_date from load_info_table order by delivery_date asc loop
for ytd_record in execute
''select sum(clean_weight)/sum(dirty_weight) as tare, ''''''||d_date.delivery_date|| ''''''::date from load_info_table where delivery_date <= ''''''||d_date.delivery_date|| '''''''' loop
return next ytd_record ;
end loop;
end loop;
return;
end' LANGUAGE 'plpgsql' VOLATILE;
test=# select * from get_factory_ytd() as (tare float8, delivery_date date);
tare | delivery_date
-------------------+---------------
0.829268292682927 | 2003-01-01
0.803571428571429 | 2003-01-02
(2 rows)Note the ::date that I stuck in the function and how I specified delivery_date as type "date" in the query.
HTH,
Joe
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