Question

SELECT  TO_CHAR(MAX(UnitPrice),'$999D99')AS"Maximum Part Price",
    TO_CHAR(Min(UnitPrice),'$99D99')AS "Minimum Part Price",
    TO_CHAR(AVG(UnitPrice),'$999D99')AS "Average Part Price",
    TO_CHAR((UnitsOnHand*UnitPrice),'$999G999D99') AS "Total Value All Parts"

FROM Part;

嗨，当我尝试这样做时，我一直都会收到错误，直到我添加最后一行都很好..但是我需要最后一行才能做到这一点...一直在尝试约3小时，它在我的头脑中

Answer 1

SELECT
  TO_CHAR(MAX(UnitPrice),'$999D99')                 AS"Maximum Part Price",
  TO_CHAR(MIN(UnitPrice),'$99D99')                  AS "Minimum Part Price",
  TO_CHAR(AVG(UnitPrice),'$999D99')                 AS "Average Part Price",
  TO_CHAR(SUM(UnitsOnHand*UnitPrice),'$999G999D99') AS "Total Value All Parts"
FROM Part

;

尝试求和函数

实施例

SELECT
  TO_CHAR(MAX(UnitPrice),'$999D99')                 AS"Maximum Part Price",
  TO_CHAR(MIN(UnitPrice),'$99D99')                  AS "Minimum Part Price",
  TO_CHAR(AVG(UnitPrice),'$999D99')                 AS "Average Part Price",
  TO_CHAR(SUM(UnitsOnHand*UnitPrice),'$999G999D99') AS "Total Value All Parts"
FROM

  (
  SELECT 1 UnitsOnHand, 20 UnitPrice FROM dual UNION
  SELECT 4 UnitsOnHand, 70 UnitPrice FROM dual UNION
  SELECT 3 UnitsOnHand, 10 UnitPrice FROM dual UNION
  select 7 UnitsOnHand, 2 UnitPrice from dual  )

结果

Max       Min     Avg     Sum
$70,00    $2,00   $25,50  $344,00

Answer 2

我认为这一行导致它获得更多行：

TO_CHAR((UnitsOnHand*UnitPrice),'$999G999D99') AS "Total Value All Parts"

也许您可以将其更改为：

TO_CHAR(MAX((UnitsOnHand*UnitPrice)),'$999G999D99') AS "Total Value All Parts"

没有一个组功能错误。

2 个答案: