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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
1998
1209
361
Carlyle
20
1227
CUSTOMER
Customer number
Customer name
Headquarters location
0121
Main St. Hardware
New York
0839
Jane's Stores
Chicago
0933
ABC Home Stores
Los Angeles
1047
Acme Hardware Store
1525
Fred's Tool Store
Atlanta
1700
XYZ Stores
Washington
1826
City Hardware
2198
Western Hardware
2267
Central Stores
CUSTOMER EMPLOYEE
Employee number
Employee name
Title
27498
Smith
Co-Owner
30441
Garcia
25270
Chen
VP Sales
Levy
Sales Manager
48285
Morton
President
33779
27470
Jones
VP Personnel
35268
Kaplan
Senior Accountant
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
Product number
Date
Quantity
2/21/2002
473
2/27/2002
170
3/1/2002
688
1,745
3/12/2002
2,529
3/17/2002
1,962
3/21/2002
3,071
4/03/2002
809
4/17/2002
734
OFFICE
Telephone
Size (sq. ft.)
901-555-4276
120
901-555-0364
100
901-555-7335
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
337
237
161
What constraint, if any, has been violated?
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