The materials manager at Pine Valley Furniture Company maintains a list of suppliers for each of the material items purchased by the company from outside vendors. Table 4-7 shows the essential data required for this application.
a. Draw a dependency diagram for this data. You may assume the following:
• Each material item has one or more suppliers. Each supplier may supply one or more items or may not supply any items.
• The unit price for a material item may vary from one vendor to another.
• The terms code for a supplier uniquely identifies the terms of the sale (e.g., code 2 means 10 percent net 30 days). The terms for a supplier are the same for all material items ordered from that supplier.
b. Decompose this diagram into a set of diagrams in 3NF.
c. Draw an E-R diagram for this situation.