0
我有3個表:SELECT INTO返回多於1行 - ORA-01422
products (prod_id, prod_name, prod_sale_price), order_details (order_id, prod_id, prod_quantity)
和orders (order_id, order_date, cust_id, emp, id)
。
基本上我試圖創建一個函數,當輸入order_id
時獲得總訂單成本,但是我在嘗試將其放入代碼時遇到問題。
特別試圖將每個產品放入一個單獨的變量中。
CREATE OR REPLACE FUNCTION TotalOrderCost (input_id IN NUMBER)
RETURN NUMBER
IS
given_id NUMBER := input_id;
prod_count NUMBER;
prod_id NUMBER;
prod_price_by_quantity NUMBER := 0;
total_order_cost NUMBER := 0;
BEGIN
SELECT COUNT(prod_id)
INTO prod_count
FROM order_details
WHERE order_id = given_id;
FOR i IN 1..prod_count
LOOP
/* select into that returns more then 1 row when there is more than one product in the order*/
SELECT prod_sale_price*prod_quantity
INTO prod_price_by_quantity
FROM order_details od
JOIN products p
ON od.prod_id = p.prod_id
WHERE order_id = given_id;
total_order_cost := total_order_cost + prod_price_by_quantity;
END LOOP;
RETURN total_order_cost;
END TotalOrderCost;
/
你的意思是你只是想選擇總和(prod_sale_price * prod_quantity'?你不需要循環,這只是意味着你計算相同的值多少次,並將它們加在一起,這會給出太高總之,我不知道我是否錯過了某些東西,但是...? – 2013-04-27 12:02:28
你已經得到了它,雖然我不得不循環,因爲訂單中有多種產品,但是效果很好。 – Michael 2013-04-27 20:00:00