问

MySQL:选择未预留的可用车辆

LING2502856847 发布于 2023-02-07 14:13

mysql

数据库

select

join

我在reservationMySQL数据库的表中有以下两条记录.

当我使用此查询来获取可用的车辆时,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,我可以在图片中看到1条记录.

在此输入图像描述

什么可能是错的,我该如何解决这个问题？

1 个回答

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;

或者您的状态条目

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;

2023-02-07 14:17 回答

小湿基_517

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