Using the INVOICE table structure shown below, do the following:
Table 1: Sample INVOICE Records
Attribute Name Sample Value Sample Value Sample Value Sample Value Sample Value
INV_NUM 211347 211347 211347 211348 211349
PROD_NUM AA-E3422QW QD-300932X RU-995748G AA-E3422QW GH-778345P
SALE_DATE 15-Jan-2010 15-Jan-2010 15-Jan-2010 15-Jan-2010 16-Jan-2010
PROD_LABEL Rotary sander 0.25-in. drill bit Band saw Rotary sander Power drill
VEND_CODE 211 211 309 211 157
VEND_NAME NeverFail, Inc. NeverFail, Inc. BeGood, Inc. NeverFail, Inc. ToughGo, Inc.
QUANT_SOLD 1 8 1 2 1
PROD_PRICE $49.95 $3.45 $39.99 $49.95 $87.75
1. 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.)
2. Remove all partial dependencies, draw the new dependency diagrams, and identify the normal forms for each table structure you created. (Hint: You can assume that any given product is supplied by a single vendor but a vendor can supply many products.)
3. Remove all transitive dependencies, and draw the new dependency diagrams. Also identify the normal forms for each table structure you created.
4. Draw the Crow’s Foot ERD.