Chapter 4 Hotel (hotelno, hotelname, city)

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Chapter 4 Hotel (hotelno, hotelname, city) Room (roomno, hotelno, Type, price) Booking (hotelno, guestno, datefrom, dateto, roomno) Guest (guestno, guestname, guestaddress)

List all hotels Hotel (hotelno, hotelname, city) Room (roomno, hotelno, Type, price) Booking (hotelno, guestno, datefrom, dateto, roomno) Guest (guestno, guestname, guestaddress)

List all hotels. Project Hotel over (hotelno, hotelname) giving T1 Or Project Hotel over (hotelno, hotelname, city) giving T1

List all single rooms with a price below $20 per night Hotel (hotelno, hotelname, city) Room (roomno, hotelno, Type, price) Booking (hotelno, guestno, datefrom, dateto, roomno) Guest (guestno, guestname, guestaddress)

List all single rooms with a price below $20 per night. Select Room where price<20 and type=‘single’ giving T1

List the names and addresses of all guests Hotel (hotelno, hotelname, city) Room (roomno, hotelno, Type, price) Booking (hotelno, guestno, datefrom, dateto, roomno) Guest (guestno, guestname, guestaddress)

List the names and addresses of all guests. Project Guest over (guestname, guestaddress) giving T1

List the price and type of all rooms at Grosvenor Hotel Hotel (hotelno, hotelname, city) Room (roomno, hotelno, type, price) Booking (hotelno, guestno, datefrom, dateto, roomno) Guest (guestno, guestname, guestaddress)

List the price and type of all rooms at Grosvenor Hotel. Room join Hotel where Room.hotelno = Hotel.hotelno giving T1 Select T1 where hotelname=‘Grosvenor’ giving T2 Project T2 over (type, price) giving T3

List all guest currently staying at the Grosvenor Hotel Hotel (hotelno, hotelname, city) Room (roomno, hotelno, Type, price) Booking (hotelno, guestno, datefrom, dateto, roomno) Guest (guestno, guestname, guestaddress)

List all guest currently staying at the Grosvenor Hotel. Hotel join Booking where Hotel.hotelno = Booking.hotelno giving T1 T1 join Guest where T1.guestno = Guest.guestno giving T2 Select T2 where hotelname=‘Grosvenor’ and datefrom <= ‘systemdate’ and dateto >= ‘systemddate’ giving T3 Project T3 over (Guest.guestno, Guest.guestname) giving T4

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 Hotel (hotelno, hotelname, city) Room (roomno, hotelno, Type, price) Booking (hotelno, guestno, datefrom, dateto, roomno) Guest (guestno, guestname, guestaddress)

Hotel join Room where Hotel.hotelno = Room.hotelno giving T6 Select T6 where hotelname=‘Grosvenor’ giving T7 Project T7 over (roomno, hotelno, type, price) giving T8

Hotel join Booking where Hotel.hotelno = Booking.hotelno giving T1 T1 join Guest where T1.guestno = Guest.guestno giving T2 Select T2 where hotelname=‘Grosvenor’ and datefrom <= ‘systemdate’ and dateto >= ‘systemdate’ giving T4 Project T4 over (roomno, guestname) giving T5

T5 right outer join T8 where T5.roomno = T8.roomno giving T9

List the guest details (guestno, guestname, and guestaddress) of all guests staying at the Grosvenor Hotel Hotel (hotelno, hotelname, city) Room (roomno, hotelno, Type, price) Booking (hotelno, guestno, datefrom, dateto, roomno) Guest (guestno, guestname, guestaddress)

Hotel join Booking where Hotel.hotelno = Booking.hotelno giving T1 Select T1 where hotelname=‘Grosvenor’ and datefrom <= ‘systemdate’ and dateto >= ‘systemdate’ giving T2 Guest semijoin T2 where Guest.guestno = T2.guestno giving T3

Create a view of all rooms in the Grosvenor Hotel, excluding price details. State advantages. Hotel (hotelno, hotelname, city) Room (roomno, hotelno, Type, price) Booking (hotelno, guestno, datefrom, dateto, roomno) Guest (guestno, guestname, guestaddress)

Create a view of all rooms in the Grosvenor Hotel, excluding price details. Room join Hotel where Room.hotelno = Hotel.hotelno giving T1 Select T1 where hotelname=‘Grosvenor’ giving T2 Project T2 over (roomno, type) giving T3 Advantages: security, user friendly, performance