Question: Which of the following operation allows us to find the tuples that are in one relation but are not in another relation?

Answer:

The set-difference operations, denoted by (-) ,allows to find tuples that are in one relation but are not in another. The expression r - s produces a relation containing those tuples in r but not in s .

For example we can find all customers of the bank who have an account but not a loan by writing

π customer-name (depositor) - π customer-name (borrower)