Produce an object-oriented database design for the Hotel case study specified at the start of the exercises in Chapter 3 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 (guest No, guest Name, and guest Address) of all guests staying at the Grosvenor Hotel.