I have 3 table in my sql database:
Table Room roomnumber roomtype 1 DeluxeRoom 2 DeluxeRoom 3 DeluxeRoom 100 StandardRoom 101 StandardRoom 102 StandardRoom
Room is a table which store the room and their type.
Table Reservation reservationid checkin checkout 1 2017-01-01 2017-01-03 2 2017-01-10 2017-01-20 3 2017-02-05 2017-02-08
Reservation is a table where users make their booking.
Table RoomReserve reservationid roomnumber 1 1 2 100 2 101 3 1 3 2 3 3
In RoomReserve, for each reservationid, I can input multiple values for roomnumber. I can also input same roomnumber for different reservationid if the checkin and checkout date are not the same.
I am trying to make a query to count the available rooms when user want to book rooms but the results i am getting is wrong.
Here are the codes i am trying:
SELECT COUNT(roomnumber) FROM room WHERE roomtype='DeluxeRoom' AND roomnumber NOT IN ( SELECT * FROM roomreserve r,reservation e, room m WHERE r.reservation_id=e.reservation_id AND m.roomnumber=r.roomnumber AND ('$ checkin' BETWEEN start_date AND end_date) OR ('$ checkout' BETWEEN start_date AND end_date)); 2) SELECT COUNT(roomnumber) FROM room WHERE roomtype='DeluxeRoom' AND roomnumber NOT IN ( SELECT COUNT(roomnumber) FROM roomreserve r,reservation e, room m WHERE r.reservation_id=e.reservation_id AND m.roomnumber=r.roomnumber AND ('$ checkin' BETWEEN start_date AND end_date) OR ('$ checkout' BETWEEN start_date AND end_date));
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