MySQL - 查找特定日期有空房的酒店

Question

我读过很多类似的问题，但无法使其对自己有用。我正在创建一个酒店预订系统，我希望列出在请求的预订日期至少有一间客房可用的酒店。

这是我的表结构

这是我到目前为止的查询

SELECT
  ac.id,
  ac.name,
  ac.link,
  ac.type,
  ac.country,
  co.name AS countryName,
  ac.state,
  st.statename,
  ac.cityid AS cityId,
  ci.name AS cityName,
  ac.addr,
  ac.featuredimage,
  ac.amenities,
  ac.starrating,
  ac.bookings_received,
  ro.roomprice,
  SUM(ro.numberofrooms) AS totalRooms,
  roomsBooked = (
  SELECT
    *,
    SUM(numberofroomsbooked) AS roomsBooked
  FROM
    bookings
  WHERE
    reservationto >= '2016-07-07' AND reservationfrom <= '2016-07-09'
    AND hotelid = ro.hotel
)
FROM
  accomodations ac
JOIN countries co ON ac.country = co.id
JOIN states st ON ac.state = st.id
JOIN city ci ON ci.id = ac.cityid
JOIN room ro ON ac.id = ro.hotel
WHERE
  ac.active = 1 AND ac.delete = 0
GROUP BY
  ac.id

我是 MySQL 新手，这确实已经失控了。这个想法是计算酒店的房间总数并减去给定日期范围内预订的房间总数。我可以得到一些帮助吗？

子查询

      SELECT
        *,
        SUM(numberofroomsbooked) AS roomsBooked
      FROM
        bookings
      WHERE
        reservationto >= '2016-07-07' AND reservationfrom <= '2016-07-09'
        AND hotelid = ro.hotel

它本身可以完美工作，但在这个中则不然。

Answer 1

编辑:基于上一个查询构建

SELECT
  ac.id,
  ac.name,
  ac.link,
  ac.type,
  ac.country,
  co.name AS countryName,
  ac.state,
  st.statename,
  ac.cityid AS cityId,
  ci.name AS cityName,
  ac.addr,
  ac.featuredimage,
  ac.amenities,
  ac.starrating,
  ac.bookings_received,
  ro.roomprice,
  ro.totalRooms
FROM
  accomodations ac
JOIN countries co ON ac.country = co.id
JOIN states st ON ac.state = st.id
JOIN city ci ON ci.id = ac.cityid
JOIN (
  SELECT
    hotel,
    roomprice,
    SUM(numberofrooms) AS totalRooms
  FROM
    room
  GROUP BY
    hotel
) ro ON ac.id = ro.hotel
JOIN (
  SELECT
    hotelid,
    SUM(numberofroomsbooked) ASroomsBooked
  FROM
    bookings
  WHERE
    reservationto >= '2016-07-07' AND reservationfrom <= '2016-07-09'
  GROUP BY
    hotelid
) bo ON ac.id = bo.hotelid
WHERE
  ac.active = 1 AND ac.delete = 0
GROUP BY
  ac.id

更新的查询删除了内部选择并将其添加为内部联接

SELECT
  ac.id,
  ac.name,
  ac.link,
  ac.type,
  ac.country,
  co.name AS countryName,
  ac.state,
  st.statename,
  ac.cityid AS cityId,
  ci.name AS cityName,
  ac.addr,
  ac.featuredimage,
  ac.amenities,
  ac.starrating,
  ac.bookings_received,
  ro.roomprice,
  SUM(ro.numberofrooms) AS totalRooms,
  SUM(tm.roomsBooked ) as roomsBooked,
FROM
  accomodations ac
JOIN countries co ON ac.country = co.id
JOIN states st ON ac.state = st.id
JOIN city ci ON ci.id = ac.cityid
JOIN room ro ON ac.id = ro.hotel
(
  SELECT
    hotelid,
    SUM(numberofroomsbooked) AS roomsBooked
  FROM
    bookings
  WHERE
    reservationto >= '2016-07-07' AND reservationfrom <= '2016-07-09'
    group by hotelid
) tm on tm.hotelid=ro.hotel
WHERE
  ac.active = 1 AND ac.delete = 0
GROUP BY
  ac.id