The requirements for TAL Distributors have changed. A number and a name now identify each storehouse. Units of each item may be stored in multiple storehouses, and it is important to know precisely how many items are stored in each storehouse. In addition, TAL Distributors now wants to manage information about the suppliers from which it purchases items.
For each item, TAL Distributors needs to know the number and name of each supplier as well as the expected lead time for delivering each item. (Lead time is the amount of time a supplier is expected to take to deliver the item after TAL Distributors has ordered it.) Each item can have many suppliers, and each supplier can supply many items.
Using this information, convert the following unnormalized relation to fourth normal form:
Item (ItemNum, Description, Category, Price, (StorehouseNum, StorehouseName, OnHand), (SupplierNum, SupplierName, LeadTime))