Question

我正在尝试计算可以用给定金额购买的商品总数。为此，我试图创建一个带有WHILE循环的块来增加项目的成本，直到满足美元值（$ 100），但无法弄清楚如何正确计算循环。

{5, 1, 2}

Answer 1

您的内容不正确。使用lv_totamt_num计算价格。还有其他小事。检查以下内容：

DECLARE
lv_totavail_num NUMBER(8,2) := 100;
lv_itemprice_num NUMBER(8,2) := 0;
lv_totamt_num NUMBER(8,2) := 0;
lv_loopnum_num NUMBER(8,2) := 0;
BEGIN
DBMS_OUTPUT.PUT_LINE('Total Starting Amount: ' || lv_totavail_num);

SELECT price
INTO lv_itemprice_num
FROM BB_PRODUCT
WHERE IDPRODUCT = 4;
DBMS_OUTPUT.PUT_LINE('Price: ' || lv_itemprice_num);
WHILE lv_totavail_num >= lv_totamt_num LOOP
lv_loopnum_num := lv_loopnum_num + 1;
lv_totamt_num := lv_itemprice_num * lv_loopnum_num;

END LOOP;
lv_loopnum_num := lv_loopnum_num -1;
DBMS_OUTPUT.PUT_LINE('Number of Items Purchased that can be purchased: ' ||lv_loopnum_num  );
DBMS_OUTPUT.PUT_LINE('Total Amount: '|| lv_loopnum_num * lv_itemprice_num);
END;

WHILE循环中的PL / SQL增量

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