sql - 查询加入还是不加入？

Question

我是 sql 新手，有什么区别

select vehicle.plates, make, model 
from vehicle 
   join registration on registration.plates = vehicle.plates 
where country = 'Japan';

和

select vehicle.plates, make, model
from registration, vehicle
where registration.plates = vehicle.plates and country=’Japan’;

Answer 1

第一个查询符合 ANSI，另一个不符合。

不过，查询应该返回相同的结果。