1. 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, hoteINo) forms the primary key

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

Guest contains guest details, and guestNo is the primary key

a) Identify the foreign keys in this schema.

b) Explain how the entity and referential integrity rules apply to these relations.

c) Suggest some general constraints that would be appropriate for this schema.

2. Using the Hotel schema in Exercise 1, describe the relations that the following relational algebra operations would produce:

3. Generate the relational algebra, tuple relational calculus, and domain relational calculus 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.

(a) hotelvo(price>50( Room )) (b) Hotel,hotelNo= Room. hotelno ( Hotel Room) (d) Guest > ( dateToivan-2007 (Booking)) (e) Hotel > Hoteinotelno = Room.notelno (price> so Soom) ) (f) guesiname,notaino (Booking Booking guestivo = Guest guostNo Guest )hotelno(ctly= Londonn ( Hotel ))