Maurice Tutor

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  • MCS,PHD
    Argosy University/ Phoniex University/
    Nov-2005 - Oct-2011

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    Phoniex University
    Oct-2001 - Nov-2016

Category > Management Posted 13 Oct 2017 My Price 5.00

relational algebra tree

Again using the Hotel schema, draw a relational algebra tree for each of the following queries and use the heuristic rules given in Section 21.3.2 to transform the queries into a more efficient form. Discuss each step and state any transformation rules used in the process.

(a) 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;

(b) 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 dateFrom >= ‘1-Jan-04’ AND dateTo

Answers

Maurice Tutor
(5)
Status NEW Posted 13 Oct 2017 09:10 PM My Price 5.00

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