3. (30 points) The following tables form part of a database held in a relational DBMS: Hotel (hotelNo, hotelName, city Room (roomNo, hotelNo, type, price) Booking (hotelNo, guest No, dateFrom, dateTo, roomNo) Guest (guestNo, guest Name, guestAddress) . 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; Guest contains guest details and guest No is the primary key (a) (Exercise 4.8) Identify the foreign keys in this schema. Explain how the entity and referential integrity rules apply to these relations. (b) (Exercise 4.9) Produce some sample tables for these relations that observe the relational in tegrity rules. Suggest some general constraints that would be appropriate for this schema