MySQL：选择未预留的可用车辆

Question

我在MySQL数据库的reservation表中有以下两条记录。

当我使用此查询获取可用的车辆时，它似乎给了我每辆车而不仅仅是指定日期之间不在预订表中的车辆。

这是查询：

SELECT v.id, v.brand, v.type, v.description, v.airco, v.seats, v.hourly_rent 
FROM vehicle as v 
WHERE v.id 
NOT IN(
  (SELECT v.id 
  FROM vehicle as v 
  LEFT JOIN reservation as r on r.`vehicle_id` = v.id 
  WHERE r.status_id in(3,4,5) 
  AND (
    (
      ('2014-01-01' >= r.startdate AND '2014-01-03' <= r.enddate )
      OR
      ('2014-01-01' <= r.startdate AND '2014-01-03' >= r.enddate ) 
    ) 
    OR
    (
      ('2014-01-01' >= r.startdate AND '2014-01-01' <= r.enddate)
      OR
      ('2014-01-03' >= r.startdate AND '2014-01-03' <= r.enddate)
    )
  )
  GROUP BY v.id
  )
)

当我使用此查询时：

SELECT *
FROM reservation as r
WHERE (
  (
    ('2014-01-01' >= r.startdate AND '2014-01-03' <= r.enddate )
    OR
    ('2014-01-01' <= r.startdate AND '2014-01-03' >= r.enddate ) 
  ) 
  OR
  (
    ('2014-01-01' >= r.startdate AND '2014-01-01' <= r.enddate)
    OR
    ('2014-01-03' >= r.startdate AND '2014-01-03' <= r.enddate)
  )
)

要获得预订，我会在图片中看到1条记录。

可能有什么问题，我该如何解决这个问题？

Answer 1

试试这个 -

SELECT v.id, v.brand, v.type, v.description, v.airco, v.seats, v.hourly_rent
FROM vehicle AS v
LEFT JOIN reservation AS r
  ON v.id = r.vehicle_id
    AND r.startdate <= '2014-01-03'
    AND r.enddate >= '2014-01-01'
WHERE r.id IS NULL;

或使用您的状态条目

SELECT v.id, v.brand, v.type, v.description, v.airco, v.seats, v.hourly_rent
FROM vehicle AS v
LEFT JOIN reservation AS r
  ON v.id = r.vehicle_id
    AND r.startdate <= '2014-01-03'
    AND r.enddate >= '2014-01-01'
    AND r.status NOT IN (3,4,5)
WHERE r.id IS NULL;

Answer 2

如果没有看到表格结构，则更难以假设这是我的破解。 只需查看V.id不在预订表中的位置。

SELECT 
    v.id, 
    v.brand, 
    v.type, 
    v.description, 
    v.airco, 
    v.seats,
    v.hourly_rent 
FROM vehicle as v 
WHERE  NOT EXISTS (
            SELECT 1 
            FROM reservation as r
            WHERE r.vehicle_id = v.id 
            AND  r.status_id NOT IN (3,4,5)
            AND(
           (
             ('2014-01-01' >= r.startdate AND '2014-01-03' <= r.enddate )
            OR
              ('2014-01-01' <= r.startdate AND '2014-01-03' >= r.enddate ) 
                        ) 
            OR
              (
               ('2014-01-01' >= r.startdate AND '2014-01-01' <= r.enddate)
            OR
              ('2014-01-03' >= r.startdate AND '2014-01-03' <= r.enddate)
               )
            ) 
        )
GROUP BY v.id))