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AND Item.Price_sold Is Not Null AND Sale.Date Like '*11*2007*'; g Report the profit on all non-consignment items this month. SELECT SUM(Line_Item_Price) - SUM(Cost) as Profit FROM ( ( Sale JOIN Line_Item ON Invoice_No ) JOIN Item ON Item_ID ) WHERE Consignment_Seller_ID IS NULL AND Price_sold IS NOT NULL AND Date LIKE '%2007-11%'; In Access: SELECT SUM(Line_Item_Price)-SUM(Cost) AS Profit FROM (Sale INNER JOIN Line_Item ON Sale.Invoice_No = Line_Item.Invoice_No) INNER JOIN Item ON Line_Item.Item_ID = Item.Item_Id WHERE Item.Consignment_Seller_ID Is Null AND Item.Price_sold Is Not Null AND Date Like '*11*2007*'; 8.6 When a customer buys an item (or several) from the store, several changes to database tables will occur. Explain what those might be. a If the customer does not yet exist in the database, a customer record must be added. b The row in table Item for the antique the customer purchases must have the column Price_sold updated. c The sale must be recorded in tables Sale and Line_Item. 8.7 The owner of the antique store doesn t want to train his people in SQL, or to teach them about all the tables in the database. He asks you to write a program that will take sales information, and then make all the changes automatically, including whatever error checking may be necessary. The clerk will enter a customer phone number (assume this is used as the Customer_ID primary key in the Customer table), an item ID (from a tag on the item), and the sale price. In pseudo code, outline how your program would record a sale. Show how you would use a transaction to insure the integrity of the database updates. Also, explain the error checking (such as verifying that the customer is already in the database) you would perform in your program, and how your program would recover from problems such as: The customer is not in the database. The item number is not in the database. The item is already sold. a Select the customer from the Customer table. One row should be returned. If so, continue at b. If no row is returned, we must add the customer to the database. Insert a new customer row in the Customer table to add this new person to the database. b Start the sale transaction. c Select the row for the Item_ID from the Item table.
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One row should be returned. Check the Price_sold column to be sure it is null (has not been sold already). If the Sale_price is null, proceed to d, otherwise report the error and roll back the transaction. If no row exists for the Item_ID, report the error, and give the clerk the option of entering a corrected Item_ID, or canceling the transaction. If the clerk cancels the sale, roll back the transaction. d Insert new rows in the Line_item and Sale tables. e Update the Price_sold column in the Item table for this Item_ID. f Commit the transaction. 8.8 When an item is sold, should the item row be removed from the Items table Why or why not Probably not. The rows in the Items table maintain information about costs and revenues, which allow us to calculate profit. These rows also provide information about consignment sales, and we need that information to pay our consignment sellers correctly. Very old entries in the Items table may be deleted, perhaps on an annual basis, to keep the size of the database smaller. However, we must be sure not to delete any information that may be required for business and tax reporting. 8.9 What transaction isolation level should apply to this application Why do you make this choice This is a rather undemanding database application. Apparently there are only three people, the proprietor and two part-time workers, who will be accessing the database. Probably there will also be only one computer from which to access the database, unless the owner, working from home, also logs in. In these conditions, one could argue that the default read_committed isolation level will be more than adequate. One could also argue that the modest performance requirements of this application mean that we should use the serializeable isolation level. Such precaution will give us the most protection, and no one will notice any performance impairment, since the application is undemanding of high performance.
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