查询加入或不加入？

Question

我是新来的sql，什么是

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

而且

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

Answer 1

第一个查询的区别是ANSI标准，另一种是没有。

尽管如此，查询应该返回相同的结果。