CREATE OR REPLACE FUNCTION public.trackinggroup(daycodewhere text) RETURNS TABLE(latitudet varchar(255), longitudet

Question

CREATE OR REPLACE FUNCTION public.trackinggroup(daycodewhere text) RETURNS TABLE(latitudet varchar(255), longitudet

varchar(255), mobiledatet timestamp without time zone)
LANGUAGE plpgsql
AS $function$
declare rec RECORD;
BEGIN
WITH integration_gps AS (
SELECT gpsid, latitude, longitude, mobiledate, accuracy FROM public.gpstracking WHERE daycode = daycodewhere
)
FOR rec IN EXECUTE 'SELECT latitude, longitude, mobiledate FROM integration_gps'
LOOP
latitudet =rec.latitude;
longitudet = rec.longitude;
mobiledatet = rec.mobiledate;
RETURN next;
END LOOP;

END;

$function$
;

Добрый день!
А что я делаю не так, не подскажете?

SQL Error [42601]: ERROR: syntax error at or near "FOR"
Позиция: 391