i get wrong results from mysql join query - mysql

Question

I have 2 tables, that i want to join, one is rooms and another is reservations.
Basically I want to search for rooms which are not reserved (not in reservation table) and to get the details of those rooms (which are not in reservation table) from room table.
Here are my tables structure:
CREATE TABLE `room` (
`roomID` int(11) NOT NULL AUTO_INCREMENT,
`hotelID` int(11) NOT NULL,
`roomtypeID` int(11) NOT NULL,
`roomNumber` int(11) NOT NULL,
`roomName` varchar(255) NOT NULL,
`roomName_en` varchar(255) NOT NULL,
`roomDescription` text,
`roomDescription_en` text,
`roomSorder` int(11) NOT NULL,
`roomVisible` tinyint(4) NOT NULL,
PRIMARY KEY (`roomID`)
) ENGINE=InnoDB AUTO_INCREMENT=29 DEFAULT CHARSET=utf8;
CREATE TABLE `reservation` (
`reservationID` int(11) NOT NULL AUTO_INCREMENT,
`customerID` int(11) NOT NULL,
`hotelID` int(11) NOT NULL,
`reservationCreatedOn` datetime NOT NULL,
`reservationCreatedFromIp` varchar(255) CHARACTER SET greek NOT NULL,
`reservationNumberOfAdults` tinyint(4) NOT NULL,
`reservationNumberOfChildrens` tinyint(4) NOT NULL,
`reservationArrivalDate` date NOT NULL,
`reservationDepartureDate` date NOT NULL,
`reservationCustomerComment` text CHARACTER SET greek,
PRIMARY KEY (`reservationID`)
) ENGINE=InnoDB AUTO_INCREMENT=47 DEFAULT CHARSET=utf8;
CREATE TABLE `reservationroom` (
`reservationroomID` int(11) NOT NULL AUTO_INCREMENT,
`reservationID` int(11) NOT NULL,
`hotelID` int(11) NOT NULL,
`roomID` int(11) NOT NULL,
PRIMARY KEY (`reservationroomID`)
) ENGINE=InnoDB AUTO_INCREMENT=47 DEFAULT CHARSET=utf8;
Here is the query that I have right now, which gives me wrong results:
SELECT * FROM room r
LEFT JOIN reservation re
ON r.hotelID = re.hotelID
WHERE re.hotelID = 13
AND NOT
(re.reservationArrivalDate >= '2014-07-07' AND re.reservationDepartureDate <= '2014-07-13')
I also have created a fiddle, with the data from both tables included:
http://sqlfiddle.com/#!2/4bb9ea/1
Any help will be deeply appreciated
Regards, John

Answer 1

i agree that room number was missed,
but query template should looks like
SELECT
*
FROM
room r
LEFT JOIN reservation re
ON r.hotelID = re.hotelID
WHERE r.hotelID = 2
AND NOT (
re.hotelID IS NOT NULL
AND re.reservationArrivalDate >= '2014-07-07'
AND re.reservationDepartureDate <= '2014-09-23'
) ;
You need change table in where statement from reservation to room. Also you need add re.hotelID to where statement as well, because on where statement you need check that record is not null ans only after try to check dates

Answer 2

Given the newly-added reservationroom table, consider using a NOT EXISTS sub-query to find rooms without reservations:
SELECT
*
FROM
room r
WHERE NOT EXISTS
(SELECT
*
FROM
reservationroom rr
WHERE
rr.reservationroomID = r.roomID
)