CSE 444 Midterm
Please define the following terms in a three sentences or less:
[10 points] Referential integrity constraints
[10 points] Correlated queries
[20 points] Decompose R(A,B,C,D,E) with functional dependencies Aà
D into BCNF. Justify your answer, show your work, and please circle the final relations in your decomposition
Given the following schema for a library, give queries for the questions below. Note that the last question asks for a query in relational algebra.
Book(ISBN, author, title, subject)
Borrowed(book_ISBN, borrowers_card_number, due_date)
Library_Patron(card_number, first_name, last_name, phone_number)
[15 points] For each book that has been both borrowed and requested, give the phone number of the borrower and the requester
[10 points] Give a SQL query for how many times have books titled A First Course in Database Systems been borrowed?
[15 points] Give a SQL query that produces the set of pairs (a, n), where n is the number of times that Alon Levy has borrowed a book authored by a.
[5 points] Give a SQL query that produces the set of pairs (borrower, number) such that "number" is the number of books borrowed by the "borrower" and that satisfy the following conditions:
- Each book has never been borrowed by someone else
- The last name of the book's author is alphabetically after the borrowers
[15 points] Give a relational algebra query to list the titles of all books borrowed by people whose last name is Pottinger