1. a) 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 the bookings and (hotelNo, guestNo, dateFrom) forms the primary key;

and Guest contains guest details and guestNo is the primary key.

Identify the foreign keys in this schema. Explain how the entity and referential integrity rules apply to these relations.

b)

Generate the relational algebra, tuple relational calculus, and domain relational calculus expressions for the following queries (use the schema from a):

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

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