18 Feb Write the relational schema, draw its dependency diagram and identify all dependencies, including all partial and transitive dependencies

3.     Using the INVOICE table structure shown in Table P6.3, do the following:

Table P6.3 Sample INVOICE Records

a.   Write the relational schema, draw its dependency diagram and identify all dependencies, including all partial and transitive dependencies. You can assume that the table does not contain repeating groups and that any invoice number may reference more than one product. (Hint: This table uses a composite primary key.)

b.   Remove all partial dependencies, draw the new dependency diagrams, and identify the normal forms for each table structure you created.

c.   Remove all transitive dependencies, and draw the new dependency diagrams. Also identify the normal forms for each table structure you created.

d.   Draw the Crow’s Foot ERD.

5.     To keep track of office furniture, computers, printers, and so on, the FOUNDIT company uses the table structure shown in Table P6.5.

Table P6.5 Sample ITEM Records

a.   Given that information, write the relational schema and draw the dependency diagram. Make sure that you label the transitive and/or partial dependencies.

b.   Write the relational schemas and create a set of dependency diagrams that meet 3NF requirements. Rename attributes to meet the naming conventions, and create new entities and attributes as necessary.

c.   Draw the Crow’s Foot ERD.