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))
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))
1 answer:
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<em><u>Answer</u></em>
5 hours
<em><u>Explanation</u></em>
The two working together can finish a job in
Also, working alone, one machine would take one hour longer than the other to complete the same job.
Let the slower machine working alone take x hours. Then the faster machine takes x-1 hours to complete the same task working alone.
Their combined rate in terms of x is
This should be equal to 20/9 hours.
Multiply through by;
Factor to get:
It is not feasible for the slower machine to complete the work alone in 4/9 hours if the two will finish in 20/9 hours.
Therefore the slower finish in 5 hours.