The following tables form part of a Library database held in an RDBMS: Book (ISBN, title, edition, year) BookCopy (copyNo, ISBN, available) Borrower (borrowerNo, borrowerName, borrowerAddress) BookLoan (copyNo, dateOut, dateDue, borrowerNo) where: Book contains details of book titles in the library and the ISBN is the key. BookCopy contains details of the individual copies of books in the library and copyNo is the key. ISBN is a foreign key identifying the book title. Borrower contains details of library members who can borrow books and borrowerNo is the key. BookLoan contains details of the book copies that are borrowed by library members and copyNo/dateOut forms the key. borrowerNo is a foreign key identifying the borrower. Formulate the following queries in relational algebra only. a. How many copies of ISBN “0-321-52306-7” are there? b. How many copies of ISBN “0-321-52306-7” are currently available c. How many times has the book title with ISBN “0-321-52306-7” been borrowed? d. Produce a report of book titles that have been borrowed by “Peter Bloomfield”
The following tables form part of a Library
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Book (ISBN, title, edition, year)
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BookCopy (copyNo, ISBN, available)
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Borrower (borrowerNo, borrowerName, borrowerAddress)
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BookLoan (copyNo, dateOut, dateDue, borrowerNo)
where:
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Book contains details of book titles in the library and the ISBN is the key.
-
BookCopy contains details of the individual copies of books in the library and copyNo is the key. ISBN is a foreign key identifying the book title.
-
Borrower contains details of library members who can borrow books and borrowerNo is the key.
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BookLoan contains details of the book copies that are borrowed by library members and copyNo/dateOut forms the key. borrowerNo is a foreign key identifying the borrower.
Formulate the following queries in relational algebra only.
a. How many copies of ISBN “0-321-52306-7” are there?
b. How many copies of ISBN “0-321-52306-7” are currently available
c. How many times has the book title with ISBN “0-321-52306-7” been borrowed?
d. Produce a report of book titles that have been borrowed by “Peter Bloomfield”
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