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
;
Try sum function
Example
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 )
Result
Max Min Avg Sum
$70,00 $2,00 $25,50 $344,00