我怎么...试着获得最后一次旅行车辆的身份。

问题描述

我想获得最后一次旅行车辆的身份证明。但是子查询给出了错误

I want to get Id of last journey vehicle. But subquery gives the error

"Subquery returned more than 1 value. This is not permitted when the subquery follows =, !=, <, <= , >, >= or when the subquery is used as an expression."

如何解决这个问题。



我的尝试：

How solve this problem.

What I have tried:

select [dbo_pibm].[tbl_Vehicle].Id,
[dbo_pibm].[tbl_Vehicle].[Vehicle_Type],
[dbo_pibm].[tbl_Vehicle].Vehicle_No,
[dbo_pibm].[tbl_User].User_firstname+' '+[dbo_pibm].[tbl_User].User_surname as driver,[dbo_pibm].[tbl_Vehicle_Journey].Start_Place + ' To ' +[dbo_pibm].[tbl_Vehicle_Journey].End_Place as Journey,
 CONVERT(VARCHAR(8),Start_Time,108) as Start_Time,
 CONVERT(VARCHAR(8),End_Time,108)as End_Time,CONVERT(VARCHAR(108),
 Journey_Date,103) as Journey_Date,
 [dbo_pibm].[tbl_Vehicle_Journey].Id as TravelId

  
 from [dbo_pibm].[tbl_Vehicle]
 left outer join  [dbo_pibm].[tbl_Vehicle_Journey] 
 on [dbo_pibm].[tbl_Vehicle].Id=[dbo_pibm].[tbl_Vehicle_Journey].Vehicle_Id
 left outer join [dbo_pibm].[tbl_User]
 on [dbo_pibm].[tbl_User].User_id=[dbo_pibm].[tbl_Vehicle_Journey].Driver
  where [dbo_pibm].[tbl_Vehicle].[Id]=(select  Vehicle_Id  from [dbo_pibm].[tbl_Vehicle_Journey] 
 group by Vehicle_Id HAVING MAX(Id)>0)

推荐答案

select  Vehicle_Id  from [dbo_pibm].[tbl_Vehicle_Journey] group by Vehicle_Id HAVING MAX(Id)>0

独立运行，看看会有多少结果。如果有不止一个，那就是问题所在。使其正确返回一个值。

Run this independently and see how many results are coming. If more than one are coming, then this is the issue. Make it correct to return one value only.

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