Dear friends,
I am a new user to postgreSQL and really need help to solve my “stupid ?” problem.
I have created function with 4 arguments like this :
CREATE OR REPLACE FUNCTION "public"."fHistoryCard" (begdate date, enddate date, ProductID varchar, storeID varchar) RETURNS SETOF "public"."tbltrans" AS
$body$
/* New function body */
select * from tbltrans
where tbltrans."Date” between $1 and $2
and upper(tbltrans."ProductID")=upper($3)
and tbltrans."StoreID"=$4
order by tbltrans."Tanggal";
$body$
LANGUAGE 'sql' VOLATILE CALLED ON NULL INPUT SECURITY INVOKER;
---------------------
My Question is : How to make argument 4 optional ? When IS NULL the function will show all transaction between date $1 and $2 and product ID=$3
But when $4 is not null then the fucntion will show all transaction between date $1 and $2 and product ID=$3 AND STOREID=$4.
I really appreciate any suggestions.
Thanks a lot.
Hengky
