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Database Relations
Using the INVOICE table structure shown in Table, do the following:
ATTRIBUTE NAME
SAMPLE VALUE
INV_NUM
211347
211348
211349
PROD_NUM
AA-E3422QW
QD-300932X
RU-995748G
GH-778345P
SALE_DATE
15-Jan-2016
16-Jan-2016
PROD_LABEL
Rotary sander
0.25-in. drill bit
Band saw
Power drill
VEND_CODE
211
309
157
VEND_NAME
NeverFail, Inc.
BeGood, Inc.
NeverFail, Inc
ToughGo, Inc.
QUANT_SOLD
1
8
2
PROD_PRICE
$49.95
$3.45
$39.99
$87.75
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 an invoice number references more than one product. (Hint: This table uses a composite primary key.)
b. Remove all partial dependencies, write the relational schema, and draw the new dependency diagrams. Identify the normal forms for each table structure you created.
c. Remove all transitive dependencies, write the relational schema, and draw the new dependency diagrams. Also identify the normal forms for each table structure you created.
d. Draw the Crow's Foot ERD.
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