Invoice

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1. Using the INVOICE table structure shown in Table P5.1, 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.) Table P5.1 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-2006 15-Jan-2006 15-Jan-2006 15-Jan-2006 16-Jan-2006 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 2. Using the initial dependency diagram drawn in Problem 1, remove all partial dependencies, draw the new dependency diagrams, and identify the normal forms for each table structure you created. NOTE You can assume that any given product is supplied by a single vendor but a vendor can supply many products. Therefore, it is proper to conclude that the following dependency exists: PROD_NUM → PROD_DESCRIPTION, PROD_PRICE, VEND_CODE, VEND_NAME (Hint: Your actions should produce three dependency diagrams.)

Transcript of Invoice

Page 1: Invoice

1. Using the INVOICE table structure shown in Table P5.1, 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.)

Table P5.1 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-2006 15-Jan-2006 15-Jan-2006 15-Jan-2006 16-Jan-2006 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

2. Using the initial dependency diagram drawn in Problem 1, remove all partial dependencies, draw the new dependency diagrams, and identify the normal forms for each table structure you created.

NOTE You can assume that any given product is supplied by a single vendor but a vendor can supply many products. Therefore, it is proper to conclude that the following dependency exists: PROD_NUM → PROD_DESCRIPTION, PROD_PRICE, VEND_CODE, VEND_NAME (Hint: Your actions should produce three dependency diagrams.)

Page 2: Invoice

Figure P5.1&2 The Dependency Diagrams for Problems 1 and 2

INV_NUM SALE_DATE VEND_CODEPROD_DESCRIPTION

Problem 1 Solution

Transitive Dependency

PROD_NUM VEND_NAME NUM_SOLD PROD_PRICE

Partial dependency

Partial dependencies

Problem 2 Solution

INV_NUM PROD_NUM NUM_SOLD

INV_NUM SALE_DATE

3NF 3NF

VEND_CODEPROD_DESCRIPTIONPROD_NUM VEND_NAMEPROD_PRICE2NF (Contains a transitive dependency)

Transitive Dependency

Relational schema: 1NF(INV_NUM, PROD_NUM, SALE_DATE, PROD_DESCRIPTION, VEND_CODE,

Relational schema: 3NF(INV_NUM, PROD_NUM, NUM_SOLD)

Relational schema: 3NF(INV_NUM, SALE_DATE)

Relational schema: 2NF(PROD_NUM, PROD_DESCRIPTION, VEND_CODE, VEND_NAME)

VEND_NAME, NUM_SOLD, PROD_PRICE)

Page 3: Invoice

Using the results of Problem 3, draw the Crow’s Foot ERD. Figure P5.4 The Invoicing ERD and Its (Partial) Relational Diagram

INV_NUMINV_NUM

INV_DATE

INV_NUMINV_NUM

INVOICE

PROD_NUMPROD_NUM

NUM_SOLD

PROD_NUMPROD_NUM

PROD_DESCRIPTION

PROD_PRICEVEND_CODE

VEND_CODEVEND_CODEVEND_NAME

LINE PRODUCT VENDOR

Crow’s Foot Invoicing ERD

Invoicing Relational Diagram, Sample Attributes

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M

MM


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