CSE 444 Midterm

Autumn 1999

Name___________________________________

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 B, Bà C, Cà 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)

Book_Request(__book_ISBN__, __requesters_card_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