[英]Select room availability between date (sql Query)
我對SQL查詢有問題。 我正在尋找輸入表單中日期之間的可用空間。
這是表模式:
餐桌間
價格表
id_price,id_room,價格,日期
例如:1、1、10、2014-05-1 | 1,1,20,2014-05-2 | 1,1,10,2014-05-3
餐桌預訂
我正在尋找的是:
如果有人在2014-5-1
至2014-05-3
預訂VIP房間,房間數量為8
然后返回空白(因為vip房間有10個分配空間,並且在2014-05-1上有3個預訂,所以只剩下7個房間)
這是SQL查詢
select room_name, COUNT( SELECT FROM booking WHERE date between '$checkin' and '$checkout') as total_booking, from room where allotment <= total_boking
這是MySQL嗎?
語法錯誤; 此外, date
是保留名稱。 請參閱下面的修訂表和SQL。
SELECT
room.room_name,
(SELECT COUNT(*) FROM booking WHERE booking.booking_date BETWEEN '' AND '') AS total_booking
FROM
room
WHERE room.allotment <= (SELECT COUNT(*) FROM booking WHERE booking.booking_date BETWEEN '' AND '')
這是表模式;
-- ----------------------------
-- Table structure for `booking`
-- ----------------------------
DROP TABLE IF EXISTS `booking`;
CREATE TABLE `booking` (
`id_booking` int(10) NOT NULL,
`id_room` int(10) NOT NULL,
`booking_date` date NOT NULL
) ENGINE=MyISAM DEFAULT CHARSET=latin1;
-- ----------------------------
-- Table structure for `price`
-- ----------------------------
DROP TABLE IF EXISTS `price`;
CREATE TABLE `price` (
`id_price` int(10) NOT NULL,
`id_room` int(10) NOT NULL,
`price` int(10) NOT NULL,
`price_date` date NOT NULL
) ENGINE=MyISAM DEFAULT CHARSET=latin1;
-- ----------------------------
-- Table structure for `room`
-- ----------------------------
DROP TABLE IF EXISTS `room`;
CREATE TABLE `room` (
`id_room` int(10) NOT NULL,
`room_name` varchar(100) NOT NULL,
`allotment` int(10) NOT NULL,
PRIMARY KEY (`id_room`)
) ENGINE=MyISAM DEFAULT CHARSET=latin1;
我傾向於將您的查詢寫為:
select room_name,
(SELECT COUNT(*)
FROM booking b
WHERE b.id_room = r.id_room and date between '$checkin' and '$checkout'
) as total_booking
from room r
having allotment <= total_booking;
請注意,子查詢現在與外部查詢相關聯,因此total_booking
適用於每個房間。
這也使用MySQL擴展,您可以在其中使用select
子句中定義的列別名來通過where
子句進行過濾。
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