Question

我的SQL查询有些问题。我正在寻找输入表单日期之间的可用空间。

这是表架构：

桌面房间

id_room，room_name，alootment
ex：1，vip，10

表价格

id_price，id_room，price，date
ex：1,1,10,2014-05-1 | 1,1,20,205-05-2 | 1,1,10,2014-05-3

餐桌预订

id_booking，id_room，date
ex：1,1,205-05-1 | 2,1，2014-05-1 | 3,1,2014-05-1

我正在寻找的是：

如果有人预订从2014-5-1到2014-05-3的贵宾室，房间数量为8

然后返回空白（因为贵宾室有10个分配，2014-05-1是3个预订，所以只剩下7个房间）

这是sql查询

select room_name, COUNT( SELECT FROM booking WHERE date between '$checkin' and '$checkout') as total_booking, from room where allotment <= total_boking

Answer 1

这是MySQL吗？

语法错误;此外，date是保留名称。请参阅下面的修订表和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 '')

这是表架构;

-- ----------------------------
-- 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;

Answer 2

我倾向于将您的查询写成：

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;

请注意，子查询现在与外部查询相关联，因此total_booking适用于每个房间。

这也使用MySQL扩展，您可以使用select子句中定义的列别名通过where子句进行过滤。

选择日期之间的房间可用性（sql查询）

2 个答案: