Question

我正在为旅行社做一个项目。我必须加入3桌

vehicle_details
rac_details已预订车辆详情
owner车主详情

预订时我需要在rac_details中搜索该日期范围内的可用车辆。

      $qry="    SELECT `vehicle_details`.*, `owner`.`owner_name`, `owner`.`id` As owner_id, 
    `rac_details`.`from_date`, `rac_details`.`to_date`, 
    `rac_details`.`vehicle_id`
     FROM (`vehicle_details`)
     LEFT JOIN `rac_details` ON `rac_details`.`vehicle_id`=`vehicle_details`.`id`
     AND `rac_details`.`from_date` NOT BETWEEN $from_timestamp AND $to_timestamp 
     AND `rac_details`.`to_date` NOT BETWEEN $from_timestamp AND $to_timestamp 
     JOIN `owner` ON `owner`.`id`=`vehicle_details`.`owner_id`
 WHERE `vehicle_details`.`model_id` =  '$model_id' ";

通过上述查询，我得到了所有车辆的详细信息。当inner join rac_details我无法获得新添加的车辆时，即rac_details中没有记录。希望有人能帮助我

修改

例如我从27日到3月3日预订了Polo，并且没有XX-YY-ZZ。那么我需要搜索车辆xx-yy-zz在那几天是否可用我的rac_details我存储了预定的车辆详细信息。然后我们购买了一辆没有RR-TT-YY的新车Vento，所以我在我的vehicle_details表中添加了这辆车，并且在第一次预订之前没有记录添加到rac_details

如果我写这个查询

 $qry="   SELECT `vehicle_details`.*, `owner`.`owner_name`, `owner`.`id` As owner_id, 
    `rac_details`.`from_date`, `rac_details`.`to_date`, 
    `rac_details`.`vehicle_id`
     FROM (`vehicle_details`)
     JOIN `rac_details` ON `rac_details`.`vehicle_id`=`vehicle_details`.`id`
     AND `rac_details`.`from_date` NOT BETWEEN $from_timestamp AND $to_timestamp 
     AND `rac_details`.`to_date` NOT BETWEEN $from_timestamp AND $to_timestamp 
     JOIN `owner` ON `owner`.`id`=`vehicle_details`.`owner_id`
 WHERE `vehicle_details`.`model_id` =  '$model_id' ";

当我第一次预订vento时，它不会在列表中显示vento，因为rac_details中没有for vento的记录

Answer 1

我会尝试使用NOT IN已预订的车辆：

"SELECT `vehicle_details`.*, `owner`.`owner_name`, `owner`.`id` As owner_id, 
`rac_details`.`from_date`, `rac_details`.`to_date`, 
`rac_details`.`vehicle_id`
 FROM (`vehicle_details`)
 JOIN `owner` ON `owner`.`id`=`vehicle_details`.`owner_id`
 WHERE `vehicle_details`.`model_id` =  '$model_id' 
 AND vehicle_details.id NOT IN (
   SELECT rac_details.vehicle_id
   FROM rac_details
   WHERE `rac_details`.`from_date` BETWEEN $from_timestamp AND $to_timestamp 
     AND `rac_details`.`to_date` BETWEEN $from_timestamp AND $to_timestamp
 )"

如何为这种情况编写查询

1 个答案: