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

Question

I have the task that 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 many parts).
I am using SQL 11g Express.
I have stared at this for so long and tried so many different ways. Below are a few of what I have tried, with the error messages. I'm not sure where I'm going wrong to get this calculation. Any help here 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

Answer 1

Hi,
893443 wrote:
... 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)
INSERT INTO CustOrder(OrderID, Qty, OrderDate, SKU, CustID)
VALUES(2101, 2, '10-26-2011', 'DVCK1212', 1101);You're still trying to put a VARCHAR2 into a DATE column. Depending on your NLS settings, that may work on your system (at least today), but it definiely doesn't work on mine.
Don't use a VARCHAR2 where a DATE is expected. Use TO_DATE to convert a string into a DATE:
http://download.oracle.com/docs/cd/E11882_01/server.112/e26088/functions203.htm#sthref1662
Ideally The report would look something like this:Why not like this?
ORDERDATE      PARTID PARTDESC                        TOTAL_QTY
10-24-2011       1003 12" X 24" Ventilated Shelf             42
10-24-2011       2001 12" X 12" Solid Shelf                 108
10-24-2011       3001 12" X 96" Side Panel                   50
10-25-2011       1004 12" X 30" Ventilated Shelf             72
10-25-2011       2001 12" X 12" Solid Shelf                  54
10-25-2011       2002 12" X 18" Solid Shelf                   6
10-25-2011       3001 12" X 96" Side Panel                   44
10-26-2011       1001 12" X 12" Ventilated Shelf             42
10-26-2011       1004 12" X 30" Ventilated Shelf              6
10-26-2011       2003 12" X 24" Solid Shelf                  12
10-26-2011       3001 12" X 96" Side Panel                   20Did you make some mistakes in your results? If not, explain how to get the correct results in the places where the ouput above is wrong. For example, how do you get the row for orderdate of Oct 26 and partid=2001?
{OrderDate    PartID    PartDesc NumOfParts(Total for that day)
10-24-2011    2001    12" X 12" Solid Shelf 108
10-24-2011    2003    12" X 24" Solid Shelf 32
10-24-2011    3001    96" Side Panel 50
10-25-2011    2002    12" X 18" Solid Shelf 6
10-25-2011    2001    12" X 12" Solid Shelf 54
10-25-2011    1004    12" X 30" Ventilated Shelf 72
10-25-2011    3001    96" Side Panel 44
10-26-2011    2001    12" X 12" Solid Shelf 12
10-26-2011    2004    12" X 30" Solid Shelf 6
10-26-2011    2003    12" X 24" Solid Shelf 12
10-26-2011    1001    12" X 12" Ventilated Shelf 30
10-26-2011    3011    96" Side Panel 20}Use \ tags, as described in my last message, before and after formatted text, to preserve spacing.
My issue is, I can't get the equation right to produce the total number of parts. I think I need to multiply ProductPart.NumOfParts by SUM(CustOrder.Qty) Group by CustOrder.SKU.More likely that you need to multiply numofparts * qty, and then take the SUM of the result.
Why would you GROUP BY sku?  Does each row of output represent a different product (and therefore a different sku), or does each row of output represent a different part. regardless of which product(s) that part is related to?
If you want a separate total for each orderdate, you'll have to include orderdate in the GROUP BY clause, too.
To get partdesc in the output, you'll either need to include partdesc in the GROUP BY clause, or wrap it in an aggregate fucntion.