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​Branch-scheme = (Branch - name, assets, branch- city)
Customer-scheme = (Customer-name, street, customer- city)
Deposit-scheme = (Branch-name, account-number, customer-name, balance)
Borrow-scheme = (Branch-name, loan-number, customer-name, amount)
Client-scheme = (Customer-name, banker-name)
Which of the following queries finds the clients of banker Agassi and the city they live in?

  • a)
    1 and 3
  • b)
    2 and 3
  • c)
    1 and 4
  • d)
    None of these
Correct answer is option 'A'. Can you explain this answer?
Verified Answer
​Branch-scheme = (Branch - name, assets, branch- city)Customer-s...
Clients of Bankers Agassi can be obtained by using the relation client_scheme while the corresponding customer_city can be obtained -using customer_scheme.
Hence cross product of client and customer must be taken. This can be achieved in two ways.
(i) First taking the Bankers Agassi clients and then checking their name in customer relation and projecting their customer city.
(ii) First taking all the customers and matching them in customer_scheme, then finding out the customers who have the Agassi as the Banker, finally projecting the customer_city of the respective customers.
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