Question

TSQL表示：列名无效＆＃39; VehicleId＆＃39;

SELECT 
(SELECT dbo.Vehicles.Id FROM dbo.Vehicles JOIN dbo.Movements 
ON dbo.Vehicles.Id=dbo.Movements.VehicleId 
WHERE dbo.Movements.Id=dbo.Alarms.MovementId) As VehicleId
FROM [dbo].[Alarms] 
WHERE 
VehicleId =1

有什么问题？

Answer 1

表Alarms没有名为VehicleId

的列

where子句不使用别名

SELECT 
(SELECT dbo.Vehicles.Id FROM dbo.Vehicles JOIN dbo.Movements 
ON dbo.Vehicles.Id=dbo.Movements.VehicleId 
WHERE dbo.Movements.Id=dbo.Alarms.MovementId) As VehicleId
FROM [dbo].[Alarms] 
WHERE 
VehicleId = 1 -- this is wrong

而不是使用相关子查询尝试多个连接

SELECT dbo.Vehicles.Id 
FROM dbo.Vehicles 
JOIN dbo.Movements 
ON dbo.Vehicles.Id = dbo.Movements.VehicleId 
JOIN dbo.Alarms
ON dbo.Alarms.MovementId = dbo.Movement.Id
WHERE dbo.Movements.VehicleId = 1

Answer 2

试试这个

SELECT Alarms.*
from 
(SELECT dbo.Vehicles.Id FROM dbo.Vehicles JOIN dbo.Movements 
ON dbo.Vehicles.Id=dbo.Movements.VehicleId 
WHERE dbo.Movements.Id=dbo.Alarms.MovementId) As VehicleId
join  [dbo].[Alarms] 
on VehicleId.ID = Alarms.vehicleID
WHERE 
VehicleId =1

Answer 3

我想，你正在寻找这样的东西：

SELECT Alarms.*
FROM dbo.Vehicles JOIN 
        dbo.Movements ON dbo.Vehicles.Id=dbo.Movements.VehicleId JOIN
        dbo.Alarms ON dbo.Movements.Id=dbo.Alarms.MovementId
WHERE VehicleId =1

SQL子查询，无效的列名称

3 个答案: