Run a query that will determine the number of parts to produce

I have the task I have to determine the number of parts that need to be produced based on the number of products sold for the day (each product consists of several parts).

I use SQL 11g Express.

I watched this during so long and tried so many different ways. Here's some of what I tried, with the error messages. I don't know where I am going wrong get this calculation. Here, any help is greatly appreciated!

Here's my info:
/**PRODUCT**/

CREATE table Product
(
    SKU       VARCHAR2(10) NOT NULL,
    ProdDesc   VARCHAR2(50) NOT NULL,
    Price      NUMBER(5,2),
    PRIMARY KEY(SKU)
);

/**PART**/
CREATE table Part
(
    PartID     NUMBER(6) NOT NULL,
    PartDesc   VARCHAR2(50) NOT NULL,
    PRIMARY KEY(PartID)
);

/**PRODUCTPART**/
CREATE table ProductPart
(
    SKU        VARCHAR2(10) NOT NULL CONSTRAINT fk_ProductPart_Product REFERENCES Product (SKU),
    PartID     NUMBER(6) NOT NULL CONSTRAINT fk_ProductPart_Part REFERENCES Part (PartID),
    NumOfParts NUMBER(3),
    CONSTRAINT pk_ProductPart PRIMARY KEY (SKU, PartID)
);

CREATE table Customer
(
    CustID     NUMBER(6) NOT NULL,
    CustFname  VARCHAR2(20) NOT NULL,
    CustLname  VARCHAR2(20) NOT NULL,
    Company    VARCHAR2(40),
    Address    VARCHAR2(40) NOT NULL,
    City       VARCHAR2(30)NOT NULL,
    State      VARCHAR2(2)NOT NULL,
    Zip        NUMBER(5)NOT NULL,
    Phone      NUMBER(10)NOT NULL,
    PRIMARY KEY (CustID)
);

CREATE table CustOrder
(
    OrderID    NUMBER(6) NOT NULL,
    Qty        NUMBER(3) NOT NULL,
    OrderDate  Date NOT NULL,
    SKU        VARCHAR(10) NOT NULL CONSTRAINT fk_CustOrder_Product REFERENCES Product (SKU),
    CustID     Number(6) NOT NULL CONSTRAINT fk_CustOrder_Customer REFERENCES Customer (CustID),
    PRIMARY KEY (OrderID)
);


Here are some of the queries:

SELECT ProductPart.Qty
    (
SELECT CustOrder.SKU,
sum(CustOrder.qty)
FROM CustOrder
    GROUP BY CustOrder.SKU;)
FROM ProductPart
WHERE ProductPart.Qty * sum(CustOrder.Qty)


ORA-00936: missing expression

SELECT o.OrderDate AS "Date Ordered",
       o.OrderDate + 5 AS "Date Due",
       pp.PartID AS "Part No.",
    pp.NumOfParts * COUNT(o.SKU) AS "Qty"
FROM CustOrder o
JOIN ProductPart pp
  ON o.SKU = pp.SKU
    GROUP BY pp.PartID, o.OrderDate, COUNT(o.SKU)
ORDER BY o.OrderDate


ORA-00934: group function is not allowed here

SELECT ProductPart.Qty,
       ProductPart.PartID,
       ProductPart.PartDesc
(SELECT COUNT(CustOrder.SKU)
 FROM CustOrder
 GROUP BY CustomerOrder.SKU)TotalProducts,
ProductPart.Qty * TotalProducts AS "Qty"
FROM ProductParty
WHERE CustOrder.SKU = Product.SKU
AND Product.SKU = ProductPart.SKU


ORA-00936: missing expression

SELECT ProductPart.Qty,
       ProductPart.PartID,
       ProductPart.PartDesc
(SELECT sum(CustOrder.qty)
FROM CustOrder
GROUP BY CustOrder.SKU)TotalProducts
    ProductPart.Qty * TotalProducts
    FROM ProductPart


ORA-00936: missing expression

Tags: Database

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