Draw the general hardware company entity-relational diagram

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Reference no: EM13835871

1. Answer questions regarding the following General Hardware Company's relational database.

SALESPERSON

Salesperson number

Salesperson name

Commission percentage

Year of hire

Office number

137

Baker

10

1995

1284

186

Adams

15

2001

1253

204

Dickens

10

1998

1209

361

Carlyle

20

2001

1227

CUSTOMER

Customer number

Customer name

Salesperson number

Headquarters location

0121

Main St. Hardware

137

New York

0839

Jane's Stores

186

Chicago

0933

ABC Home Stores

137

Los Angeles

1047

Acme Hardware Store

137

Los Angeles

1525

Fred's Tool Store

361

Atlanta

1700

XYZ Stores

361

Washington

1826

City Hardware

137

New York

2198

Western Hardware

204

New York

2267

Central Stores

186

New York

CUSTOMER EMPLOYEE

Customer number

Employee number

Employee name

Title

0121

27498

Smith

Co-Owner

0121

30441

Garcia

Co-Owner

0933

25270

Chen

VP Sales

0933

30441

Levy

Sales Manager

0933

48285

Morton

President

1525

33779

Baker

Sales Manager

2198

27470

Smith

President

2198

30441

Jones

VP Sales

2198

33779

Garcia

VP Personnel

2198

35268

Kaplan

Senior Accountant

PRODUCT

Product

Product

Unit

number

name

price

 

16386

Wrench

12.95

19440

I Iammer

17.50

21765

Drill

32.99

24013

Saw

26.25

26722

Pliers

11.50

SALES

Salesperson number

Customer number

Product
number

Date

Quantity

137

0839

19440

2/21/2002

473

137

1700

24013

2/27/2002

170

137

2267

26722

3/1/2002

688

186

1047

16386

3/1/2002

1,745

186

0839

19440

3/12/2002

2,529

186

1700

21765

3/17/2002

1,962

361

0121

24013

3/21/2002

3,071

204

2267

21765

4/03/2002

809

204

0839

26722

4/17/2002

734

OFFICE

Office number

Telephone

Size (sq. ft.)

1253

901-555-4276

120

1227

901-555-0364

100

1284

901-555-7335

120

1209

901-555-3108

95

A. Draw the General Hardware Company Entity-Relational diagram.

B. Choose a primary key for each of the relations.

C. Choose foreign key(s) for each of the relations.

D. Determine the cardinality of the relationships between a. Salesperson and Customer b. Customer and Customer Employee c. Salesperson and Product d. Customer and Product e. Salesperson and Office E. Suppose that salesperson 361, Carlyle, left the company and his record was deleted from the SALESPERSON relation. Have it affected the database data integrity? Explain.

F. Suppose that after a number of transactions, the table CUSTOMER looks like following

CUSTOMER

Customer number

Customer name

Salesperson number

Headquarters location

0121

Main St. Hardware

337

New York

0839

Jane's Stores

186

Chicago

0933

ABC Home Stores

237

Los Angeles

1047

Acme Hardware Store

137

Los Angeles

1525

Fred's Tool Store

361

Atlanta

1700

XYZ Stores

161

Washington

What constraint, if any, has been violated?

Reference no: EM13835871

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