Question

Problem 1. Using the INVOICE table structure shown in table below do the following:

INVOICE

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-2016	15-Jan-2016	15-Jan-2016	15-Jan-2016	16-Jan-2016
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 an invoice number references more than one product. (Hint:This table uses a composite primary key.)
2. Remove all partial dependencies, write the relational schema, and draw the new dependency diagrams. Identify the normal forms for each table structure you created.
3. 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.
4. Draw the Crow’s Foot ERD.

                       

Problem 2. Use the dependency diagram shown below to work the following problems.

Initial Dependency Diagram for Problem

Figure 1

5. Break up the dependency diagram shown in Figure 1 to create two new dependency diagrams: one in 3NF and one in 2NF.
6. Modify the dependency diagrams you created in part a to produce a set of dependency diagrams that are in 3NF. (Hint:One of your dependency diagrams should be in 3NF but not in BCNF.)
7. Modify the dependency diagrams you created in Part b to produce a collection of dependency diagrams that are in 3NF and BCNF.

Answer 1