6.9 List the names and addresses of all guests in London, alphabetically ordered by name.

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1 ADDITIONAL EXERCISES FOR DATABASE SQL 6.7 List full details of all hotels. SELECT * FROM Hotel; 6.8 List full details of all hotels in London. SELECT * FROM Hotel WHERE city = London ; 6.9 List the names and addresses of all guests in London, alphabetically ordered by name. SELECT guestname, guestaddress FROM Guest WHERE address LIKE %London% ORDER BY guestname; Strictly speaking, this would also find rows with an address like: 10 London Avenue, New York List all double or family rooms with a price below per night, in ascending order of price. SELECT * FROM Room WHERE price < 40 AND type IN ( D, F ) ORDER BY price; (Note, ASC is the default setting) List the bookings for which no dateto has been specified. SELECT * FROM Booking WHERE dateto IS NULL; 6.12 How many hotels are there? SELECT COUNT(*) FROM Hotel; 6.13 What is the average price of a room? SELECT AVG(price) FROM Room; 6.14 What is the total revenue per night from all double rooms? SELECT SUM(price) FROM Room WHERE type = D ; 6.15 How many different guests have made bookings for August? SELECT COUNT(DISTINCT guestno) FROM Booking WHERE (datefrom <= DATE AND dateto >= DATE ) OR (datefrom >= DATE AND datefrom <= DATE );

2 6.22 List the number of rooms in each hotel. SELECT hotelno, COUNT(roomNo) AS count FROM Room GROUP BY hotelno; 6.23 List the number of rooms in each hotel in London. SELECT hotelno, COUNT(roomNo) AS count FROM Room r, Hotel h WHERE r.hotelno = h.hotelno AND city = London GROUP BY hotelno; 6.28 Update the price of all rooms by 5%. UPDATE Room SET price = price*1.05; 2. Answer below questions based on schema in the exercises at the end of chapter 5. List all borrower details. SELECT * FROM Borrower; List all book titles published in the year SELECT title FROM Book WHERE year = 2012 ; List all copies of book titles that are available for borrowing. SELECT copyno, title FROM BookCopy bc, Book b WHERE bc.isbn = b.isbn AND bc.available = Y ; List all copies of the book title Lord of the Rings that are available for borrowing. SELECT copyno FROM BookCopy bc, Book b WHERE bc.isbn = b.isbn AND bc.available = Y AND title = Lord of the Rings ;

3 List the names of borrowers who currently have the book title Lord of the Rings on loan. SELECT borrowername FROM Borrower bw, Book b, BookCopy bc, BookLoan bl WHERE bw.borrowerno = bl.borrowerno AND bl.copyno = bc.copyno AND bc.isbn = b.isbn AND bc.available = N AND title = Lord of the Rings ; List the names of borrowers with overdue books. SELECT borrowername From Borrower bw, BookLoan bl WHERE bw.borrowerno = bl.borrowerno and datedue > today s date; How many copies of ISBN are there? SELECT COUNT(*) FROM BookCopy WHERE ISBN = ; How many copies of ISBN are currently available? SELECT COUNT(copyNo) FROM BookCopy WHERE available = Y AND ISBN = ; How many times has the book with ISBN been borrowed? SELECT COUNT(*) FROM BookCopy bc, BookLoan bl WHERE bc.copyno = bl.copyno AND ISBN = ; Produce a report of book titles that have been borrowed by Peter Bloomfield. SELECT DISTINCT title FROM Borrower bw, Book b, BookCopy bc, BookLoan bl WHERE bw.borrowerno = bl.borrowerno AND bl.copyno = bc.copyno AND bc.isbn = b.isbn AND borrowername = Peter Bloomfield ;

Entity Relationship Diagram 1. Use the following business rules to create a Crow s Foot ERD. Write all appropriate connectivities and cardinalities in the ERD. a. A department employs many employees, but each employee is employed by one department.

4 Entity Relationship Diagram 1. Use the following business rules to create a Crow s Foot ERD. Write all appropriate connectivities and cardinalities in the ERD. a. A department employs many employees, but each employee is employed by one department. b. Some employees, known as rovers, are not assigned to any department. c. A division operates many departments, but each department is operated by one division. d. An employee may be assigned many projects, and a project may have many employees assigned to it. e. A project must have at least one employee assigned to it. f. One of the employees manages each department, and each department is managed by only one employee. g. One of the employees runs each division, and each division is run by only one employee.

5 2. The Jonesburgh County Basketball Conference (JCBC) is an amateur basketball association. Each city in the county has one team as its representative. Each team has a maximum of 12 players and a minimum of 9 players. Each team also has up to three coaches (offensive, defensive, and physical training coaches). During the season, each team plays two games (home and visitor) against each of the other teams. Given those conditions, do the following: a. Identify the connectivity of each relationship. b. Identify the type of dependency that exists between CITY and TEAM. c. Identify the cardinality between teams and players and between teams and city. d. Identify the dependency between coach and team and between team and player. e. Draw the Chen and Crow s Foot ERDs to represent the JCBC database. M M (1,1) GAME (1,1) (2,N) (2,N) CITY sponsors TEAM has (1,1) (1,1) (9,12) 1 (1,3) M (1,1) PLAYER is coached by M (1,1) COACH

6 3. Create an ERD based on the Crow s Foot model, using the following requirements: An INVOICE is written by a SALESREP. Each sales representative can write many invoices, but each invoice is written by a single sales representative. The INVOICE is written for a single CUSTOMER. However, each customer can have many invoices. An INVOICE can include many detail lines (LINE), each of which describes one product bought by the customer. The product information is stored in a PRODUCT entity. The product s vendor information is found in a VENDOR entity.

7 Normalization 1. (a) Identify the dependencies (b) Normalize the table

8 2. Using the description of the attributes given in below figure, convert the ERD shown into a dependency diagram and at least 3NF table.

4. Using the Invoice table structure below: (a) Write the relational schema, draw its dependency diagram and identify all dependencies, including all partial and transitive dependencies.

9 4. Using the Invoice table structure below: (a) Write the relational schema, draw its dependency diagram and identify all dependencies, including all partial and transitive dependencies. You can assume that the table does not contain repeating groups and that any invoice number may reference more than one product. (Hint: This table uses a composite primary key.) (b) Normalize it to 2NF and 3NF

1 P a g e D a t a b a s e o l d p a p e r b y w a s i m

1 P a g e D a t a b a s e o l d p a p e r b y w a s i m Q#1. What is concurrency control? Ans: Concurrency control (CC) is a process to ensure that data is updated correctly andappropriately when multiple