Question

大家好我试图显示给定日期所有可用汽车的列表我尝试使用BETWEEN但未成功。在汽车表中添加另一个字段（状态）并使用状态查询是一个好主意。有一个好方法吗？或者通过在return_date？

之间使用booking_date来显示它是否更好？

预订：

    id  customer_id  car_id  booking_date  return_date  time_stamp      
------  -----------  ------  ------------  -----------  ----------------
     1            2       5  2015-11-04    2015-11-12   15.06.10 20:10  
     2            3       2  2015-11-02    2015-11-13   15.06.10 20:10  
     3            1      11  2015-11-05    2015-11-16   15.06.10 20:10  
     4            4       8  2015-11-10    2015-12-16   15.06.10 20:10  
     5            0       0  0000-00-00    0000-00-00   15.06.10 20:10

CarType：

   id  car_type_id  branch_id  registration_number  color    date_of_manifacturing  base_price_per_day  
------  -----------  ---------  -------------------  -------  ---------------------  --------------------
     1            1          1  BG-123-431           Bela     2010-11-15                               30
     2            2          1  BG-A32-212           Metalik  2015-11-04                               30
     3            3          2  PA-332-421           Metalik  2008-05-03                               35
     4            4          1  SM-312-542           Crna     2014-06-01                               35
     5            5          1  BG-4393-54           Crna     2012-05-03                               50
     6            6          1  NS-423-64            Bela     2010-10-08                               50

汽车：

   id  car_type_id  branch_id  registration_number  color    date_of_manifacturing  base_price_per_day  
------  -----------  ---------  -------------------  -------  ---------------------  --------------------
     1            1          1  BG-123-431           Bela     2010-11-15                               30
     2            2          1  BG-A32-212           Metalik  2015-11-04                               30
     3            3          2  PA-332-421           Metalik  2008-05-03                               35
     4            4          1  SM-312-542           Crna     2014-06-01                               35
     5            5          1  BG-4393-54           Crna     2012-05-03                               50
     6            6          1  NS-423-64            Bela     2010-10-08                               50

我的所有预订都是这样列出的：

SELECT BOOKING.BOOKING_NUMBER, BOOKING.BOOKING_DATE,
BOOKING.RETURN_DATE, AGENCY.NAME, CAR.REGISTRATION_NUMBER,
CAR_TYPE.NAME
FROM BOOKING
JOIN AGENCY ON BOOKING.AGENCY_ID = AGENCY.ID
JOIN CAR ON CAR.ID = BOOKING.CAR_ID
JOIN CAR_TYPE ON CAR_TYPE.ID = CAR.CAR_TYPE_ID

但是对于所有可用的车辆我都不知道。任何一个例子？

Answer 1

使用您的booking表格，您可以了解一天内预订的汽车@checkDate

SELECT *
FROM BOOKING
WHERE @checkDate BETWEEN booking_date  AND return_date

因此，要在该日期获得可用汽车，请使用：

SELECT *
FROM Cars 
WHERE car_id not in (
                      SELECT car_id
                      FROM BOOKING
                      WHERE @checkDate BETWEEN booking_date  AND return_date  
                     )

或在您的完整查询中<或者

SELECT 
      BOOKING.BOOKING_NUMBER, BOOKING.BOOKING_DATE,
      BOOKING.RETURN_DATE, AGENCY.NAME, 
      CAR.REGISTRATION_NUMBER, CAR_TYPE.NAME
FROM BOOKING
JOIN AGENCY ON BOOKING.AGENCY_ID = AGENCY.ID
JOIN CAR ON CAR.ID = BOOKING.CAR_ID
JOIN CAR_TYPE ON CAR_TYPE.ID = CAR.CAR_TYPE_ID
WHERE
    CAR.car_id not in (
                        SELECT car_id
                        FROM BOOKING
                        WHERE @checkDate BETWEEN booking_date  AND return_date  
                      )

Answer 2

您可以使用LEFT JOIN：

SELECT 
  CAR.REGISTRATION_NUMBER,
  CAR_TYPE.NAME,
  AGENCY.NAME, 
  CASE 
    WHEN BOOKING.CAR_ID IS NULL THEN 'Not Booked' 
    ELSE 'Booked' 
  END AS Status,
  BOOKING.BOOKING_NUMBER, 
  BOOKING.BOOKING_DATE,
  BOOKING.RETURN_DATE
FROM CAR
INNER JOIN CAR_TYPE ON CAR_TYPE.ID      = CAR.CAR_TYPE_ID
LEFT JOIN BOOKING  ON CAR.ID            = BOOKING.CAR_ID
LEFT JOIN AGENCY   ON BOOKING.AGENCY_ID = AGENCY.ID;

这将为您提供所有可用的汽车，如果任何汽车没有预订，它将带有NULL预订和代理商值，Status列将显示是否预订

列出给定日期SQL的所有可用汽车

2 个答案: