# Relational Algebra Expression

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The following tables form part of a database held in a relational DBMS:

Hotel (hotelNo, hotelName, city)

Room (roomNo, hotelNo, type, price)

Booking (hotelNo, guestNo, dateFrom, dateTo, roomNo)

Guest (guestNo, guestName, guestAddress)

where Hotel contains hotel details and hotelNo is the primary key;

Room contains room details for each hotel and (roomNo, hotelNo) forms the primary key;

Booking contains details of bookings and (hotelNo, guestNo, dateFrom) forms the primary key;

Guest contains guest details and guestNo is the primary key.

Generate the relational algebra expressions for the following queries:

(a) List all hotels.

(b) List all single rooms with a price below $20 per night.

(c) List the names and cities of all guests.

(d) List the price and type of all rooms at the Grosvenor Hotel.

(e) List all guests currently staying at the Grosvenor Hotel.

(f) List the details of all rooms at the Grosvenor Hotel, including the name of the guest staying in the room, if the room is occupied.

(g) List the guest details (guestNo, guestName, and guestAddress) of all guests staying at the Grosvenor Hotel.

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##### Solution Summary

Arelational algebra expression is formulated.

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