Computers and Technology, 29.08.2020 18:01 ayeelol1447
Consider a library database with the following schema (where primary keys are underlined):Book(bookID, ISBN, title, author, publish-year, category)Member(memberID, lastname, firstname, address, phone-number, limit)CurrentLoan(memberID, bookID, loan-date, due-date)History(memberID, bookID, loan-date, return-date)Members can borrow books from the library. The number of books they can borrow is limited by the "limit" field of the Member relation. The category of a book includes fiction, non-fiction, children’s and reference. The CurrentLoan table represents the information about books that are currently checked out. When the book is returned to the library, the record will be removed from CurrentLoad relation, and will be inserted into History relation with the return-date. A library may have more than one copy of the same book, in which case each copy has its own bookID, but all copies share the same ISBN. Express each of the following tasks in relational algebra. a. Find the phone-number and address of James Baker. b. Find the last name and first name of the member who is currently borrowing a book for which the bookID is 120058.c. List the bookID, title and author of all the books that were borrowed in the past by James Baker. d. List the bookID and title of all the books that are either currently checked out or borrowed in the past by James Baker. e. Find the bookID and title of all the books that are not currently checked out.
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Consider a library database with the following schema (where primary keys are underlined):Book(bookI...
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