27.8 Map the object-oriented database design for the Hotel case study produced in Exercise 26.14 and then show
how the following queries would be written in OQL:
(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.
Compare the OQL answers with the equivalent relational algebra and relational calculus expressions of
Exercise 4.12.