Consider a table named ORDER_ITEM, with data as shown in Figure 2-26. The schema for ORD...

Consider a table named ORDER_ITEM, with data as shown in Figure 2-26. The schema for ORDER_ITEM is:

ORDER_ITEM is: ORDER_ITEM (OrderNumber, SKU, Quantity, Price)

where SKU is a “Stocking Keeping Unit” number, which is similar to a part number. Here it indicates which product was sold on each line of the table. Note that one OrderNumber must have at least one SKU associated with it, and may have several. Use this table and the detailed discussion of normal forms on pages 88–89 to answer the following questions.

A. Define 1NF. Is ORDER_ITEM in 1NF? If not, why not, and what would have to be done to put it into 1NF? Make any changes necessary to put ORDER_ ITEM into 1NF. If this step requires you to create an additional table, make sure that the new table is also in 1NF.

B. Define 2NF. Now that ORDER_ITEM is in 1NF, is it also in 2NF? If not, why not, and what would have to be done to put it into 2NF? Make any changes necessary to put ORDER_ITEM into 2NF. If this step requires you to create an additional table, make sure that the new table is also in 2NF.

C. Define 3NF. Now that ORDER_ITEM is in 2NF, is it also in 3NF? If not, why not, and what would have to be done to put it into 3NF? Make any changes necessary to put ORDER_ITEM into 3NF. If this step requires you to create an additional table, make sure that the new table and any other tables created in previous steps are also in 3NF.

D. Define BCNF. Now that ORDER_ITEM is in 3NF, is it also in BCNF? If not, why not, and what would have to be done to put it into BCNF? Make any changes necessary to put ORDER_ITEM into BCNF. If this step requires you to create an additional table, make sure that the new table and any other tables created in previous steps are also in BCNF.