Consider the following tables, Loan and Borrower, of a bank. Loan loan_num…

Consider the following tables, Loan and Borrower, of a bank.

Loan

Borrower

Query: $\pi_{branch\_name,customer\_name}(Loan\bowtie Borrower)\div\pi_{branch\_name}(Loan)$

where $\bowtie$ denotes natural join.

The number of tuples returned by the above relational algebra query is

(Answer in integer)