SQL语句，加入

Question

select userId, firstname, lastname, userVehicleId
from users

我想在users和userVehicle之间建立内部联接。这是我到目前为止，任何人都可以帮忙吗？

内部加入

select userId, firstname, lastname, userVehicleId
from users
inner join userVehicleId
on userVehicle
where users.userId = userVehicle.userVehicleId

Answer 1

您的问题不明确，可能您需要此查询吗？

select u.userId, u.firstname, u.lastname, u.userVehicleId
from users u
inner join userVehicle uv
on uv.id=u.id 

Answer 2

As far as I understand, you want to get userId, firstname and lastname for users who have vehicles, right?

It can be something like this:

SELECT u.userId, u.firstname, u.lastname, uv.userVehicleId
FROM users u 
INNER JOIN userVehicle uv 
  ON u.userId=uv.userVehicleId 

Please, provide structure for users and userVehicle tables to get more accurate answer.