CREATE OR REPLACE FUNCTION fun_get_real_inv_qty(pvOrderId varchar)
  RETURNS SETOF record AS
$BODY$begin
--drop table if exists tmp_1 ;
--create temp table tmp_1 as 
return query 
	select fp_prod_id,fq_part_no,fq_name, 
	sum(case when fo_type='P' then -fp_qty 	    
		    else 0
	      end 
	) as purchase_qty,
	sum(case when fo_type='S' then -fp_qty 	    
		    else 0
	      end 
	) as saleqty,
	sum(case when fo_type='S' then -fp_qty 
		    when fo_type='P' then fp_qty 
		    else 0
	      end ) as surplus_qty  from tp_send_det,to_send_note,tq_prod_mstr
	where fp_order_id=pvOrderId  and fo_note_id=fp_note_id and fq_prod_id=fp_prod_id and fq_type='I'
	group by fp_prod_id,fq_part_no,fq_name ;
end;$BODY$
  LANGUAGE plpgsql VOLATILE
  COST 100
  ROWS 10;
ALTER FUNCTION fun_get_real_inv_qty()
  OWNER TO postgres;
 

上面是例子,呼叫這個函式:

select * from fun_get_real_inv_qty('D302')  f(fp_prod_id bigint,fq_part_no varchar ,fq_name varchar ,purchase_qty numeric ,saleqty numeric ,surplus_qty numeric )  ;

f...後面帶的是記錄的column定義 必須與函式輸出的列數量及每列資料型別一一對應.