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Again using  the Hotel schema, drawing a relational algebra tree for each of the following queries and use the heuristic rules given in Section 23.3.2 to transform the queries into a more efficient form. Discuss each step and state any transformation rules used in the process.   1. SELECT r.roomNo, r.type, r.price FROM Room r, Booking b, Hotel h WHERE r.roomNo = b.roomNo AND b.hotelNo = h.hotelNo AND h.hotelName = ‘Grosvenor Hotel’ AND r.price > 100;   2. SELECT g.guestNo, g.guestName FROM Room r, Hotel h, Booking b, Guest g WHERE h.hotelNo = b.hotelNo AND g.guestNo = b.guestNo AND h.hotelNo = r.hotelNo AND h.hotelName = ‘Grosvenor Hotel’ AND dataFrom >= ‘1-Jan-08’ AND dateTo <= ’31-Dec-08’;

Again using  the Hotel schema, drawing a relational algebra tree for each of the following queries and use the heuristic rules given in Section 23.3.2 to transform the queries into a more efficient form. Discuss each step and state any transformation rules used in the process.   1. SELECT r.roomNo, r.type, r.price FROM Room r, Booking b, Hotel h WHERE r.roomNo = b.roomNo AND b.hotelNo = h.hotelNo AND h.hotelName = ‘Grosvenor Hotel’ AND r.price > 100;   2. SELECT g.guestNo, g.guestName FROM Room r, Hotel h, Booking b, Guest g WHERE h.hotelNo = b.hotelNo AND g.guestNo = b.guestNo AND h.hotelNo = r.hotelNo AND h.hotelName = ‘Grosvenor Hotel’ AND dataFrom >= ‘1-Jan-08’ AND dateTo <= ’31-Dec-08’;

Database System Concepts
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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Again using  the Hotel schema, drawing a relational algebra tree for each of the following queries and use the heuristic rules given in Section 23.3.2 to transform the queries into a more efficient form. Discuss each step and state any transformation rules used in the process.

 

1.

SELECT r.roomNo, r.type, r.price

FROM Room r, Booking b, Hotel h

WHERE r.roomNo = b.roomNo AND b.hotelNo = h.hotelNo AND h.hotelName = ‘Grosvenor Hotel’ AND r.price > 100;

 

2.

SELECT g.guestNo, g.guestName

FROM Room r, Hotel h, Booking b, Guest g

WHERE h.hotelNo = b.hotelNo AND g.guestNo = b.guestNo AND h.hotelNo = r.hotelNo AND h.hotelName = ‘Grosvenor Hotel’ AND dataFrom >= ‘1-Jan-08’ AND dateTo <= ’31-Dec-08’;

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