1. Consider the General Hardware Corp. database of Figure 6.1. Describe the problem of referential integrity in terms of the CUSTOMER and CUSTOMER EMPLOYEE relations if the record for customer 2198 in the CUSTOMER relation is deleted. (Assume that no delete rules exist.)

Customer Number 0121 0839 0933 1047 1525 1700 1826 2198 2267 (b) CUSTOMER relation Customer Salesperson Nome Number Main St. Hardware 137 Jane's Stores 186 ABC Home Stores 137 Acme Hardware Store 137 Fred's Tool Stores 361 XYZ Stores 361 City Hardware 137 Western Hardware 204 Central Stores 186 HQ City New York Chicago Los Angeles Los Angeles Atlanta Washington New York New York New York Customer Number 0121 0121 0933 0933 0933 1525 2198 2198 2198 2198 (0) CUSTOMER EMPLOYEE relation Employee Employee Number Nome Title 27498 Smith Co-Owner 30441 Garcia Co-Owner 25270 Chen VP Sales 30441 Levy Sales Manager 48285 Morton President 33779 Baker Sales Manager 27470 Smith President 30441 Jones VP Sales 33779 Garcia VP Personnel 35268 Kaplan Senior Accountant (Continues)