-- Function: "DeleteDay"(date)-- DROP FUNCTION "DeleteDay"(date);CREATE OR REPLACE FUNCTION "DeleteDay"(date) RETURNS void AS$BODY$DELETE FROM dashboard_orderstate WHERE order_date = $1;DELETE FROM dashboard_orderstatesubsetarchive WHERE order_date = $1;DELETE FROM dashboard_statistic WHERE day =$1;$BODY$ LANGUAGE 'sql' VOLATILE STRICT;ALTER FUNCTION "DeleteDay"(date) OWNER TO dashboard;================How to call this function ?EXECUTE FUNCTION DeleteDay("20070410"); does not work