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3. Consider the following bank database: BANK(Code, Name, Addr) BANK_BRANCH(Code, BranchNo, Addr) ACCOUNT(AcctNo, Balance, Type, Code, BranchNo) LOAN LoanNo, Amount, Type, Code, BranchNo) CUSTOMER(SSN, Name,

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3. Consider the following bank database: BANK(Code, Name, Addr) BANK_BRANCH(Code, BranchNo, Addr) ACCOUNT(AcctNo, Balance, Type, Code, BranchNo) LOAN LoanNo, Amount, Type, Code, BranchNo) CUSTOMER(SSN, Name, Addr, Phone) DEPENDENT(SSN,dname, bdate, sex) A C(AcctNo,_SSN) L C(LoanNo, SSN) Write a query to find the number of customers who have dependents but do not have any loans. Create views for the subquery parts and use the set difference operator

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